300d3739e8
Revert commit 45226e9 (NMI watchdog: fix for lockup detector breakage
on resume) which breaks resume from system suspend on my SH7372
Mackerel board (by causing a NULL pointer dereference to happen) and
is generally wrong, because it abuses the CPU hotplug functionality
in a shamelessly blatant way.
The original issue should be addressed through appropriate syscore
resume callback instead.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2825 lines
83 KiB
C
2825 lines
83 KiB
C
#ifndef _LINUX_SCHED_H
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#define _LINUX_SCHED_H
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/*
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* cloning flags:
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*/
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#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
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#define CLONE_VM 0x00000100 /* set if VM shared between processes */
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#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
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#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
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#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
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#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
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#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
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#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
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#define CLONE_THREAD 0x00010000 /* Same thread group? */
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#define CLONE_NEWNS 0x00020000 /* New namespace group? */
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#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
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#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
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#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
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#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
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#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
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#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
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#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
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/* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
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and is now available for re-use. */
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#define CLONE_NEWUTS 0x04000000 /* New utsname group? */
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#define CLONE_NEWIPC 0x08000000 /* New ipcs */
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#define CLONE_NEWUSER 0x10000000 /* New user namespace */
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#define CLONE_NEWPID 0x20000000 /* New pid namespace */
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#define CLONE_NEWNET 0x40000000 /* New network namespace */
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#define CLONE_IO 0x80000000 /* Clone io context */
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/*
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* Scheduling policies
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*/
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#define SCHED_NORMAL 0
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#define SCHED_FIFO 1
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#define SCHED_RR 2
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#define SCHED_BATCH 3
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/* SCHED_ISO: reserved but not implemented yet */
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#define SCHED_IDLE 5
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/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
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#define SCHED_RESET_ON_FORK 0x40000000
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#ifdef __KERNEL__
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struct sched_param {
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int sched_priority;
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};
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#include <asm/param.h> /* for HZ */
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#include <linux/capability.h>
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#include <linux/threads.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/timex.h>
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#include <linux/jiffies.h>
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#include <linux/rbtree.h>
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#include <linux/thread_info.h>
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#include <linux/cpumask.h>
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#include <linux/errno.h>
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#include <linux/nodemask.h>
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#include <linux/mm_types.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/cputime.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/signal.h>
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#include <linux/compiler.h>
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#include <linux/completion.h>
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#include <linux/pid.h>
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#include <linux/percpu.h>
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#include <linux/topology.h>
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#include <linux/proportions.h>
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#include <linux/seccomp.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist.h>
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#include <linux/rtmutex.h>
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#include <linux/time.h>
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#include <linux/param.h>
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#include <linux/resource.h>
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#include <linux/timer.h>
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#include <linux/hrtimer.h>
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#include <linux/task_io_accounting.h>
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#include <linux/latencytop.h>
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#include <linux/cred.h>
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#include <linux/llist.h>
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#include <linux/uidgid.h>
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#include <asm/processor.h>
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struct exec_domain;
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struct futex_pi_state;
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struct robust_list_head;
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struct bio_list;
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struct fs_struct;
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struct perf_event_context;
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struct blk_plug;
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/*
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* List of flags we want to share for kernel threads,
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* if only because they are not used by them anyway.
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*/
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#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
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/*
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* These are the constant used to fake the fixed-point load-average
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* counting. Some notes:
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* - 11 bit fractions expand to 22 bits by the multiplies: this gives
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* a load-average precision of 10 bits integer + 11 bits fractional
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* - if you want to count load-averages more often, you need more
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* precision, or rounding will get you. With 2-second counting freq,
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* the EXP_n values would be 1981, 2034 and 2043 if still using only
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* 11 bit fractions.
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*/
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extern unsigned long avenrun[]; /* Load averages */
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extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
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#define FSHIFT 11 /* nr of bits of precision */
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#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
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#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
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#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
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#define EXP_5 2014 /* 1/exp(5sec/5min) */
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#define EXP_15 2037 /* 1/exp(5sec/15min) */
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#define CALC_LOAD(load,exp,n) \
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load *= exp; \
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load += n*(FIXED_1-exp); \
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load >>= FSHIFT;
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extern unsigned long total_forks;
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extern int nr_threads;
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DECLARE_PER_CPU(unsigned long, process_counts);
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extern int nr_processes(void);
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extern unsigned long nr_running(void);
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extern unsigned long nr_uninterruptible(void);
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extern unsigned long nr_iowait(void);
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extern unsigned long nr_iowait_cpu(int cpu);
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extern unsigned long this_cpu_load(void);
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extern void calc_global_load(unsigned long ticks);
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extern void update_cpu_load_nohz(void);
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extern unsigned long get_parent_ip(unsigned long addr);
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struct seq_file;
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struct cfs_rq;
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struct task_group;
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#ifdef CONFIG_SCHED_DEBUG
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extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
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extern void proc_sched_set_task(struct task_struct *p);
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extern void
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print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
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#else
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static inline void
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proc_sched_show_task(struct task_struct *p, struct seq_file *m)
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{
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}
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static inline void proc_sched_set_task(struct task_struct *p)
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{
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}
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static inline void
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print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
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{
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}
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#endif
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/*
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* Task state bitmask. NOTE! These bits are also
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* encoded in fs/proc/array.c: get_task_state().
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*
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* We have two separate sets of flags: task->state
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* is about runnability, while task->exit_state are
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* about the task exiting. Confusing, but this way
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* modifying one set can't modify the other one by
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* mistake.
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*/
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#define TASK_RUNNING 0
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#define TASK_INTERRUPTIBLE 1
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#define TASK_UNINTERRUPTIBLE 2
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#define __TASK_STOPPED 4
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#define __TASK_TRACED 8
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/* in tsk->exit_state */
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#define EXIT_ZOMBIE 16
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#define EXIT_DEAD 32
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/* in tsk->state again */
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#define TASK_DEAD 64
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#define TASK_WAKEKILL 128
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#define TASK_WAKING 256
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#define TASK_STATE_MAX 512
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#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
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extern char ___assert_task_state[1 - 2*!!(
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sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
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/* Convenience macros for the sake of set_task_state */
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#define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
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#define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED)
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#define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED)
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/* Convenience macros for the sake of wake_up */
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#define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
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#define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
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/* get_task_state() */
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#define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \
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TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
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__TASK_TRACED)
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#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
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#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
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#define task_is_dead(task) ((task)->exit_state != 0)
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#define task_is_stopped_or_traced(task) \
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((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
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#define task_contributes_to_load(task) \
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((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
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(task->flags & PF_FROZEN) == 0)
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#define __set_task_state(tsk, state_value) \
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do { (tsk)->state = (state_value); } while (0)
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#define set_task_state(tsk, state_value) \
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set_mb((tsk)->state, (state_value))
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/*
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* set_current_state() includes a barrier so that the write of current->state
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* is correctly serialised wrt the caller's subsequent test of whether to
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* actually sleep:
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*
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* set_current_state(TASK_UNINTERRUPTIBLE);
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* if (do_i_need_to_sleep())
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* schedule();
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*
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* If the caller does not need such serialisation then use __set_current_state()
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*/
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#define __set_current_state(state_value) \
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do { current->state = (state_value); } while (0)
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#define set_current_state(state_value) \
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set_mb(current->state, (state_value))
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/* Task command name length */
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#define TASK_COMM_LEN 16
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#include <linux/spinlock.h>
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/*
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* This serializes "schedule()" and also protects
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* the run-queue from deletions/modifications (but
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* _adding_ to the beginning of the run-queue has
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* a separate lock).
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*/
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extern rwlock_t tasklist_lock;
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extern spinlock_t mmlist_lock;
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struct task_struct;
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#ifdef CONFIG_PROVE_RCU
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extern int lockdep_tasklist_lock_is_held(void);
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#endif /* #ifdef CONFIG_PROVE_RCU */
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extern void sched_init(void);
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extern void sched_init_smp(void);
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extern asmlinkage void schedule_tail(struct task_struct *prev);
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extern void init_idle(struct task_struct *idle, int cpu);
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extern void init_idle_bootup_task(struct task_struct *idle);
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extern int runqueue_is_locked(int cpu);
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
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extern void select_nohz_load_balancer(int stop_tick);
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extern void set_cpu_sd_state_idle(void);
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extern int get_nohz_timer_target(void);
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#else
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static inline void select_nohz_load_balancer(int stop_tick) { }
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static inline void set_cpu_sd_state_idle(void) { }
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#endif
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/*
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* Only dump TASK_* tasks. (0 for all tasks)
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*/
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extern void show_state_filter(unsigned long state_filter);
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static inline void show_state(void)
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{
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show_state_filter(0);
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}
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extern void show_regs(struct pt_regs *);
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/*
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* TASK is a pointer to the task whose backtrace we want to see (or NULL for current
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* task), SP is the stack pointer of the first frame that should be shown in the back
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* trace (or NULL if the entire call-chain of the task should be shown).
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*/
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extern void show_stack(struct task_struct *task, unsigned long *sp);
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void io_schedule(void);
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long io_schedule_timeout(long timeout);
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extern void cpu_init (void);
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extern void trap_init(void);
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extern void update_process_times(int user);
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extern void scheduler_tick(void);
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extern void sched_show_task(struct task_struct *p);
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#ifdef CONFIG_LOCKUP_DETECTOR
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extern void touch_softlockup_watchdog(void);
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extern void touch_softlockup_watchdog_sync(void);
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extern void touch_all_softlockup_watchdogs(void);
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extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos);
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extern unsigned int softlockup_panic;
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void lockup_detector_init(void);
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#else
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static inline void touch_softlockup_watchdog(void)
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{
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}
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static inline void touch_softlockup_watchdog_sync(void)
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{
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}
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static inline void touch_all_softlockup_watchdogs(void)
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{
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}
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static inline void lockup_detector_init(void)
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{
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}
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#endif
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#ifdef CONFIG_DETECT_HUNG_TASK
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extern unsigned int sysctl_hung_task_panic;
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extern unsigned long sysctl_hung_task_check_count;
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extern unsigned long sysctl_hung_task_timeout_secs;
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extern unsigned long sysctl_hung_task_warnings;
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extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos);
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#else
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/* Avoid need for ifdefs elsewhere in the code */
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enum { sysctl_hung_task_timeout_secs = 0 };
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#endif
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/* Attach to any functions which should be ignored in wchan output. */
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#define __sched __attribute__((__section__(".sched.text")))
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/* Linker adds these: start and end of __sched functions */
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extern char __sched_text_start[], __sched_text_end[];
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/* Is this address in the __sched functions? */
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extern int in_sched_functions(unsigned long addr);
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#define MAX_SCHEDULE_TIMEOUT LONG_MAX
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extern signed long schedule_timeout(signed long timeout);
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extern signed long schedule_timeout_interruptible(signed long timeout);
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extern signed long schedule_timeout_killable(signed long timeout);
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extern signed long schedule_timeout_uninterruptible(signed long timeout);
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asmlinkage void schedule(void);
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extern void schedule_preempt_disabled(void);
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extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
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struct nsproxy;
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struct user_namespace;
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/*
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* Default maximum number of active map areas, this limits the number of vmas
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* per mm struct. Users can overwrite this number by sysctl but there is a
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* problem.
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*
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* When a program's coredump is generated as ELF format, a section is created
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* per a vma. In ELF, the number of sections is represented in unsigned short.
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* This means the number of sections should be smaller than 65535 at coredump.
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* Because the kernel adds some informative sections to a image of program at
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* generating coredump, we need some margin. The number of extra sections is
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* 1-3 now and depends on arch. We use "5" as safe margin, here.
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*/
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#define MAPCOUNT_ELF_CORE_MARGIN (5)
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#define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
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extern int sysctl_max_map_count;
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#include <linux/aio.h>
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#ifdef CONFIG_MMU
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extern void arch_pick_mmap_layout(struct mm_struct *mm);
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extern unsigned long
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arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
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unsigned long, unsigned long);
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extern unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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extern void arch_unmap_area(struct mm_struct *, unsigned long);
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extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
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#else
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static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
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#endif
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extern void set_dumpable(struct mm_struct *mm, int value);
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extern int get_dumpable(struct mm_struct *mm);
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/* get/set_dumpable() values */
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#define SUID_DUMPABLE_DISABLED 0
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#define SUID_DUMPABLE_ENABLED 1
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#define SUID_DUMPABLE_SAFE 2
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/* mm flags */
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/* dumpable bits */
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#define MMF_DUMPABLE 0 /* core dump is permitted */
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#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
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#define MMF_DUMPABLE_BITS 2
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#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
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/* coredump filter bits */
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#define MMF_DUMP_ANON_PRIVATE 2
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#define MMF_DUMP_ANON_SHARED 3
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#define MMF_DUMP_MAPPED_PRIVATE 4
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#define MMF_DUMP_MAPPED_SHARED 5
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#define MMF_DUMP_ELF_HEADERS 6
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#define MMF_DUMP_HUGETLB_PRIVATE 7
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#define MMF_DUMP_HUGETLB_SHARED 8
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#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
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#define MMF_DUMP_FILTER_BITS 7
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#define MMF_DUMP_FILTER_MASK \
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(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
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#define MMF_DUMP_FILTER_DEFAULT \
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((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
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(1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
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#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
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# define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS)
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#else
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# define MMF_DUMP_MASK_DEFAULT_ELF 0
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#endif
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/* leave room for more dump flags */
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#define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */
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#define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */
|
|
#define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */
|
|
|
|
#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
|
|
|
|
struct sighand_struct {
|
|
atomic_t count;
|
|
struct k_sigaction action[_NSIG];
|
|
spinlock_t siglock;
|
|
wait_queue_head_t signalfd_wqh;
|
|
};
|
|
|
|
struct pacct_struct {
|
|
int ac_flag;
|
|
long ac_exitcode;
|
|
unsigned long ac_mem;
|
|
cputime_t ac_utime, ac_stime;
|
|
unsigned long ac_minflt, ac_majflt;
|
|
};
|
|
|
|
struct cpu_itimer {
|
|
cputime_t expires;
|
|
cputime_t incr;
|
|
u32 error;
|
|
u32 incr_error;
|
|
};
|
|
|
|
/**
|
|
* struct task_cputime - collected CPU time counts
|
|
* @utime: time spent in user mode, in &cputime_t units
|
|
* @stime: time spent in kernel mode, in &cputime_t units
|
|
* @sum_exec_runtime: total time spent on the CPU, in nanoseconds
|
|
*
|
|
* This structure groups together three kinds of CPU time that are
|
|
* tracked for threads and thread groups. Most things considering
|
|
* CPU time want to group these counts together and treat all three
|
|
* of them in parallel.
|
|
*/
|
|
struct task_cputime {
|
|
cputime_t utime;
|
|
cputime_t stime;
|
|
unsigned long long sum_exec_runtime;
|
|
};
|
|
/* Alternate field names when used to cache expirations. */
|
|
#define prof_exp stime
|
|
#define virt_exp utime
|
|
#define sched_exp sum_exec_runtime
|
|
|
|
#define INIT_CPUTIME \
|
|
(struct task_cputime) { \
|
|
.utime = 0, \
|
|
.stime = 0, \
|
|
.sum_exec_runtime = 0, \
|
|
}
|
|
|
|
/*
|
|
* Disable preemption until the scheduler is running.
|
|
* Reset by start_kernel()->sched_init()->init_idle().
|
|
*
|
|
* We include PREEMPT_ACTIVE to avoid cond_resched() from working
|
|
* before the scheduler is active -- see should_resched().
|
|
*/
|
|
#define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE)
|
|
|
|
/**
|
|
* struct thread_group_cputimer - thread group interval timer counts
|
|
* @cputime: thread group interval timers.
|
|
* @running: non-zero when there are timers running and
|
|
* @cputime receives updates.
|
|
* @lock: lock for fields in this struct.
|
|
*
|
|
* This structure contains the version of task_cputime, above, that is
|
|
* used for thread group CPU timer calculations.
|
|
*/
|
|
struct thread_group_cputimer {
|
|
struct task_cputime cputime;
|
|
int running;
|
|
raw_spinlock_t lock;
|
|
};
|
|
|
|
#include <linux/rwsem.h>
|
|
struct autogroup;
|
|
|
|
/*
|
|
* NOTE! "signal_struct" does not have its own
|
|
* locking, because a shared signal_struct always
|
|
* implies a shared sighand_struct, so locking
|
|
* sighand_struct is always a proper superset of
|
|
* the locking of signal_struct.
|
|
*/
|
|
struct signal_struct {
|
|
atomic_t sigcnt;
|
|
atomic_t live;
|
|
int nr_threads;
|
|
|
|
wait_queue_head_t wait_chldexit; /* for wait4() */
|
|
|
|
/* current thread group signal load-balancing target: */
|
|
struct task_struct *curr_target;
|
|
|
|
/* shared signal handling: */
|
|
struct sigpending shared_pending;
|
|
|
|
/* thread group exit support */
|
|
int group_exit_code;
|
|
/* overloaded:
|
|
* - notify group_exit_task when ->count is equal to notify_count
|
|
* - everyone except group_exit_task is stopped during signal delivery
|
|
* of fatal signals, group_exit_task processes the signal.
|
|
*/
|
|
int notify_count;
|
|
struct task_struct *group_exit_task;
|
|
|
|
/* thread group stop support, overloads group_exit_code too */
|
|
int group_stop_count;
|
|
unsigned int flags; /* see SIGNAL_* flags below */
|
|
|
|
/*
|
|
* PR_SET_CHILD_SUBREAPER marks a process, like a service
|
|
* manager, to re-parent orphan (double-forking) child processes
|
|
* to this process instead of 'init'. The service manager is
|
|
* able to receive SIGCHLD signals and is able to investigate
|
|
* the process until it calls wait(). All children of this
|
|
* process will inherit a flag if they should look for a
|
|
* child_subreaper process at exit.
|
|
*/
|
|
unsigned int is_child_subreaper:1;
|
|
unsigned int has_child_subreaper:1;
|
|
|
|
/* POSIX.1b Interval Timers */
|
|
struct list_head posix_timers;
|
|
|
|
/* ITIMER_REAL timer for the process */
|
|
struct hrtimer real_timer;
|
|
struct pid *leader_pid;
|
|
ktime_t it_real_incr;
|
|
|
|
/*
|
|
* ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
|
|
* CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
|
|
* values are defined to 0 and 1 respectively
|
|
*/
|
|
struct cpu_itimer it[2];
|
|
|
|
/*
|
|
* Thread group totals for process CPU timers.
|
|
* See thread_group_cputimer(), et al, for details.
|
|
*/
|
|
struct thread_group_cputimer cputimer;
|
|
|
|
/* Earliest-expiration cache. */
|
|
struct task_cputime cputime_expires;
|
|
|
|
struct list_head cpu_timers[3];
|
|
|
|
struct pid *tty_old_pgrp;
|
|
|
|
/* boolean value for session group leader */
|
|
int leader;
|
|
|
|
struct tty_struct *tty; /* NULL if no tty */
|
|
|
|
#ifdef CONFIG_SCHED_AUTOGROUP
|
|
struct autogroup *autogroup;
|
|
#endif
|
|
/*
|
|
* Cumulative resource counters for dead threads in the group,
|
|
* and for reaped dead child processes forked by this group.
|
|
* Live threads maintain their own counters and add to these
|
|
* in __exit_signal, except for the group leader.
|
|
*/
|
|
cputime_t utime, stime, cutime, cstime;
|
|
cputime_t gtime;
|
|
cputime_t cgtime;
|
|
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
|
|
cputime_t prev_utime, prev_stime;
|
|
#endif
|
|
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
|
|
unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
|
|
unsigned long inblock, oublock, cinblock, coublock;
|
|
unsigned long maxrss, cmaxrss;
|
|
struct task_io_accounting ioac;
|
|
|
|
/*
|
|
* Cumulative ns of schedule CPU time fo dead threads in the
|
|
* group, not including a zombie group leader, (This only differs
|
|
* from jiffies_to_ns(utime + stime) if sched_clock uses something
|
|
* other than jiffies.)
|
|
*/
|
|
unsigned long long sum_sched_runtime;
|
|
|
|
/*
|
|
* We don't bother to synchronize most readers of this at all,
|
|
* because there is no reader checking a limit that actually needs
|
|
* to get both rlim_cur and rlim_max atomically, and either one
|
|
* alone is a single word that can safely be read normally.
|
|
* getrlimit/setrlimit use task_lock(current->group_leader) to
|
|
* protect this instead of the siglock, because they really
|
|
* have no need to disable irqs.
|
|
*/
|
|
struct rlimit rlim[RLIM_NLIMITS];
|
|
|
|
#ifdef CONFIG_BSD_PROCESS_ACCT
|
|
struct pacct_struct pacct; /* per-process accounting information */
|
|
#endif
|
|
#ifdef CONFIG_TASKSTATS
|
|
struct taskstats *stats;
|
|
#endif
|
|
#ifdef CONFIG_AUDIT
|
|
unsigned audit_tty;
|
|
struct tty_audit_buf *tty_audit_buf;
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
/*
|
|
* group_rwsem prevents new tasks from entering the threadgroup and
|
|
* member tasks from exiting,a more specifically, setting of
|
|
* PF_EXITING. fork and exit paths are protected with this rwsem
|
|
* using threadgroup_change_begin/end(). Users which require
|
|
* threadgroup to remain stable should use threadgroup_[un]lock()
|
|
* which also takes care of exec path. Currently, cgroup is the
|
|
* only user.
|
|
*/
|
|
struct rw_semaphore group_rwsem;
|
|
#endif
|
|
|
|
int oom_adj; /* OOM kill score adjustment (bit shift) */
|
|
int oom_score_adj; /* OOM kill score adjustment */
|
|
int oom_score_adj_min; /* OOM kill score adjustment minimum value.
|
|
* Only settable by CAP_SYS_RESOURCE. */
|
|
|
|
struct mutex cred_guard_mutex; /* guard against foreign influences on
|
|
* credential calculations
|
|
* (notably. ptrace) */
|
|
};
|
|
|
|
/* Context switch must be unlocked if interrupts are to be enabled */
|
|
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
|
|
# define __ARCH_WANT_UNLOCKED_CTXSW
|
|
#endif
|
|
|
|
/*
|
|
* Bits in flags field of signal_struct.
|
|
*/
|
|
#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
|
|
#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
|
|
#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
|
|
/*
|
|
* Pending notifications to parent.
|
|
*/
|
|
#define SIGNAL_CLD_STOPPED 0x00000010
|
|
#define SIGNAL_CLD_CONTINUED 0x00000020
|
|
#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
|
|
|
|
#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
|
|
|
|
/* If true, all threads except ->group_exit_task have pending SIGKILL */
|
|
static inline int signal_group_exit(const struct signal_struct *sig)
|
|
{
|
|
return (sig->flags & SIGNAL_GROUP_EXIT) ||
|
|
(sig->group_exit_task != NULL);
|
|
}
|
|
|
|
/*
|
|
* Some day this will be a full-fledged user tracking system..
|
|
*/
|
|
struct user_struct {
|
|
atomic_t __count; /* reference count */
|
|
atomic_t processes; /* How many processes does this user have? */
|
|
atomic_t files; /* How many open files does this user have? */
|
|
atomic_t sigpending; /* How many pending signals does this user have? */
|
|
#ifdef CONFIG_INOTIFY_USER
|
|
atomic_t inotify_watches; /* How many inotify watches does this user have? */
|
|
atomic_t inotify_devs; /* How many inotify devs does this user have opened? */
|
|
#endif
|
|
#ifdef CONFIG_FANOTIFY
|
|
atomic_t fanotify_listeners;
|
|
#endif
|
|
#ifdef CONFIG_EPOLL
|
|
atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
|
|
#endif
|
|
#ifdef CONFIG_POSIX_MQUEUE
|
|
/* protected by mq_lock */
|
|
unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
|
|
#endif
|
|
unsigned long locked_shm; /* How many pages of mlocked shm ? */
|
|
|
|
#ifdef CONFIG_KEYS
|
|
struct key *uid_keyring; /* UID specific keyring */
|
|
struct key *session_keyring; /* UID's default session keyring */
|
|
#endif
|
|
|
|
/* Hash table maintenance information */
|
|
struct hlist_node uidhash_node;
|
|
kuid_t uid;
|
|
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
atomic_long_t locked_vm;
|
|
#endif
|
|
};
|
|
|
|
extern int uids_sysfs_init(void);
|
|
|
|
extern struct user_struct *find_user(kuid_t);
|
|
|
|
extern struct user_struct root_user;
|
|
#define INIT_USER (&root_user)
|
|
|
|
|
|
struct backing_dev_info;
|
|
struct reclaim_state;
|
|
|
|
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
|
|
struct sched_info {
|
|
/* cumulative counters */
|
|
unsigned long pcount; /* # of times run on this cpu */
|
|
unsigned long long run_delay; /* time spent waiting on a runqueue */
|
|
|
|
/* timestamps */
|
|
unsigned long long last_arrival,/* when we last ran on a cpu */
|
|
last_queued; /* when we were last queued to run */
|
|
};
|
|
#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
|
|
|
|
#ifdef CONFIG_TASK_DELAY_ACCT
|
|
struct task_delay_info {
|
|
spinlock_t lock;
|
|
unsigned int flags; /* Private per-task flags */
|
|
|
|
/* For each stat XXX, add following, aligned appropriately
|
|
*
|
|
* struct timespec XXX_start, XXX_end;
|
|
* u64 XXX_delay;
|
|
* u32 XXX_count;
|
|
*
|
|
* Atomicity of updates to XXX_delay, XXX_count protected by
|
|
* single lock above (split into XXX_lock if contention is an issue).
|
|
*/
|
|
|
|
/*
|
|
* XXX_count is incremented on every XXX operation, the delay
|
|
* associated with the operation is added to XXX_delay.
|
|
* XXX_delay contains the accumulated delay time in nanoseconds.
|
|
*/
|
|
struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
|
|
u64 blkio_delay; /* wait for sync block io completion */
|
|
u64 swapin_delay; /* wait for swapin block io completion */
|
|
u32 blkio_count; /* total count of the number of sync block */
|
|
/* io operations performed */
|
|
u32 swapin_count; /* total count of the number of swapin block */
|
|
/* io operations performed */
|
|
|
|
struct timespec freepages_start, freepages_end;
|
|
u64 freepages_delay; /* wait for memory reclaim */
|
|
u32 freepages_count; /* total count of memory reclaim */
|
|
};
|
|
#endif /* CONFIG_TASK_DELAY_ACCT */
|
|
|
|
static inline int sched_info_on(void)
|
|
{
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
return 1;
|
|
#elif defined(CONFIG_TASK_DELAY_ACCT)
|
|
extern int delayacct_on;
|
|
return delayacct_on;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
enum cpu_idle_type {
|
|
CPU_IDLE,
|
|
CPU_NOT_IDLE,
|
|
CPU_NEWLY_IDLE,
|
|
CPU_MAX_IDLE_TYPES
|
|
};
|
|
|
|
/*
|
|
* Increase resolution of nice-level calculations for 64-bit architectures.
|
|
* The extra resolution improves shares distribution and load balancing of
|
|
* low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
|
|
* hierarchies, especially on larger systems. This is not a user-visible change
|
|
* and does not change the user-interface for setting shares/weights.
|
|
*
|
|
* We increase resolution only if we have enough bits to allow this increased
|
|
* resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
|
|
* when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
|
|
* increased costs.
|
|
*/
|
|
#if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */
|
|
# define SCHED_LOAD_RESOLUTION 10
|
|
# define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION)
|
|
# define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION)
|
|
#else
|
|
# define SCHED_LOAD_RESOLUTION 0
|
|
# define scale_load(w) (w)
|
|
# define scale_load_down(w) (w)
|
|
#endif
|
|
|
|
#define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION)
|
|
#define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT)
|
|
|
|
/*
|
|
* Increase resolution of cpu_power calculations
|
|
*/
|
|
#define SCHED_POWER_SHIFT 10
|
|
#define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
|
|
|
|
/*
|
|
* sched-domains (multiprocessor balancing) declarations:
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */
|
|
#define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */
|
|
#define SD_BALANCE_EXEC 0x0004 /* Balance on exec */
|
|
#define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */
|
|
#define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */
|
|
#define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */
|
|
#define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */
|
|
#define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */
|
|
#define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */
|
|
#define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */
|
|
#define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */
|
|
#define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */
|
|
#define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */
|
|
|
|
extern int __weak arch_sd_sibiling_asym_packing(void);
|
|
|
|
struct sched_group_power {
|
|
atomic_t ref;
|
|
/*
|
|
* CPU power of this group, SCHED_LOAD_SCALE being max power for a
|
|
* single CPU.
|
|
*/
|
|
unsigned int power, power_orig;
|
|
unsigned long next_update;
|
|
/*
|
|
* Number of busy cpus in this group.
|
|
*/
|
|
atomic_t nr_busy_cpus;
|
|
|
|
unsigned long cpumask[0]; /* iteration mask */
|
|
};
|
|
|
|
struct sched_group {
|
|
struct sched_group *next; /* Must be a circular list */
|
|
atomic_t ref;
|
|
|
|
unsigned int group_weight;
|
|
struct sched_group_power *sgp;
|
|
|
|
/*
|
|
* The CPUs this group covers.
|
|
*
|
|
* NOTE: this field is variable length. (Allocated dynamically
|
|
* by attaching extra space to the end of the structure,
|
|
* depending on how many CPUs the kernel has booted up with)
|
|
*/
|
|
unsigned long cpumask[0];
|
|
};
|
|
|
|
static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
|
|
{
|
|
return to_cpumask(sg->cpumask);
|
|
}
|
|
|
|
/*
|
|
* cpumask masking which cpus in the group are allowed to iterate up the domain
|
|
* tree.
|
|
*/
|
|
static inline struct cpumask *sched_group_mask(struct sched_group *sg)
|
|
{
|
|
return to_cpumask(sg->sgp->cpumask);
|
|
}
|
|
|
|
/**
|
|
* group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
|
|
* @group: The group whose first cpu is to be returned.
|
|
*/
|
|
static inline unsigned int group_first_cpu(struct sched_group *group)
|
|
{
|
|
return cpumask_first(sched_group_cpus(group));
|
|
}
|
|
|
|
struct sched_domain_attr {
|
|
int relax_domain_level;
|
|
};
|
|
|
|
#define SD_ATTR_INIT (struct sched_domain_attr) { \
|
|
.relax_domain_level = -1, \
|
|
}
|
|
|
|
extern int sched_domain_level_max;
|
|
|
|
struct sched_domain {
|
|
/* These fields must be setup */
|
|
struct sched_domain *parent; /* top domain must be null terminated */
|
|
struct sched_domain *child; /* bottom domain must be null terminated */
|
|
struct sched_group *groups; /* the balancing groups of the domain */
|
|
unsigned long min_interval; /* Minimum balance interval ms */
|
|
unsigned long max_interval; /* Maximum balance interval ms */
|
|
unsigned int busy_factor; /* less balancing by factor if busy */
|
|
unsigned int imbalance_pct; /* No balance until over watermark */
|
|
unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
|
|
unsigned int busy_idx;
|
|
unsigned int idle_idx;
|
|
unsigned int newidle_idx;
|
|
unsigned int wake_idx;
|
|
unsigned int forkexec_idx;
|
|
unsigned int smt_gain;
|
|
int flags; /* See SD_* */
|
|
int level;
|
|
int idle_buddy; /* cpu assigned to select_idle_sibling() */
|
|
|
|
/* Runtime fields. */
|
|
unsigned long last_balance; /* init to jiffies. units in jiffies */
|
|
unsigned int balance_interval; /* initialise to 1. units in ms. */
|
|
unsigned int nr_balance_failed; /* initialise to 0 */
|
|
|
|
u64 last_update;
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
/* load_balance() stats */
|
|
unsigned int lb_count[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
|
|
unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
|
|
|
|
/* Active load balancing */
|
|
unsigned int alb_count;
|
|
unsigned int alb_failed;
|
|
unsigned int alb_pushed;
|
|
|
|
/* SD_BALANCE_EXEC stats */
|
|
unsigned int sbe_count;
|
|
unsigned int sbe_balanced;
|
|
unsigned int sbe_pushed;
|
|
|
|
/* SD_BALANCE_FORK stats */
|
|
unsigned int sbf_count;
|
|
unsigned int sbf_balanced;
|
|
unsigned int sbf_pushed;
|
|
|
|
/* try_to_wake_up() stats */
|
|
unsigned int ttwu_wake_remote;
|
|
unsigned int ttwu_move_affine;
|
|
unsigned int ttwu_move_balance;
|
|
#endif
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
char *name;
|
|
#endif
|
|
union {
|
|
void *private; /* used during construction */
|
|
struct rcu_head rcu; /* used during destruction */
|
|
};
|
|
|
|
unsigned int span_weight;
|
|
/*
|
|
* Span of all CPUs in this domain.
|
|
*
|
|
* NOTE: this field is variable length. (Allocated dynamically
|
|
* by attaching extra space to the end of the structure,
|
|
* depending on how many CPUs the kernel has booted up with)
|
|
*/
|
|
unsigned long span[0];
|
|
};
|
|
|
|
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
|
|
{
|
|
return to_cpumask(sd->span);
|
|
}
|
|
|
|
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
|
|
struct sched_domain_attr *dattr_new);
|
|
|
|
/* Allocate an array of sched domains, for partition_sched_domains(). */
|
|
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
|
|
void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
|
|
|
|
/* Test a flag in parent sched domain */
|
|
static inline int test_sd_parent(struct sched_domain *sd, int flag)
|
|
{
|
|
if (sd->parent && (sd->parent->flags & flag))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
|
|
unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
|
|
|
|
bool cpus_share_cache(int this_cpu, int that_cpu);
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
struct sched_domain_attr;
|
|
|
|
static inline void
|
|
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
|
|
struct sched_domain_attr *dattr_new)
|
|
{
|
|
}
|
|
|
|
static inline bool cpus_share_cache(int this_cpu, int that_cpu)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
#endif /* !CONFIG_SMP */
|
|
|
|
|
|
struct io_context; /* See blkdev.h */
|
|
|
|
|
|
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
|
|
extern void prefetch_stack(struct task_struct *t);
|
|
#else
|
|
static inline void prefetch_stack(struct task_struct *t) { }
|
|
#endif
|
|
|
|
struct audit_context; /* See audit.c */
|
|
struct mempolicy;
|
|
struct pipe_inode_info;
|
|
struct uts_namespace;
|
|
|
|
struct rq;
|
|
struct sched_domain;
|
|
|
|
/*
|
|
* wake flags
|
|
*/
|
|
#define WF_SYNC 0x01 /* waker goes to sleep after wakup */
|
|
#define WF_FORK 0x02 /* child wakeup after fork */
|
|
#define WF_MIGRATED 0x04 /* internal use, task got migrated */
|
|
|
|
#define ENQUEUE_WAKEUP 1
|
|
#define ENQUEUE_HEAD 2
|
|
#ifdef CONFIG_SMP
|
|
#define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */
|
|
#else
|
|
#define ENQUEUE_WAKING 0
|
|
#endif
|
|
|
|
#define DEQUEUE_SLEEP 1
|
|
|
|
struct sched_class {
|
|
const struct sched_class *next;
|
|
|
|
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
|
|
void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
|
|
void (*yield_task) (struct rq *rq);
|
|
bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
|
|
|
|
void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
|
|
|
|
struct task_struct * (*pick_next_task) (struct rq *rq);
|
|
void (*put_prev_task) (struct rq *rq, struct task_struct *p);
|
|
|
|
#ifdef CONFIG_SMP
|
|
int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
|
|
|
|
void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
|
|
void (*post_schedule) (struct rq *this_rq);
|
|
void (*task_waking) (struct task_struct *task);
|
|
void (*task_woken) (struct rq *this_rq, struct task_struct *task);
|
|
|
|
void (*set_cpus_allowed)(struct task_struct *p,
|
|
const struct cpumask *newmask);
|
|
|
|
void (*rq_online)(struct rq *rq);
|
|
void (*rq_offline)(struct rq *rq);
|
|
#endif
|
|
|
|
void (*set_curr_task) (struct rq *rq);
|
|
void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
|
|
void (*task_fork) (struct task_struct *p);
|
|
|
|
void (*switched_from) (struct rq *this_rq, struct task_struct *task);
|
|
void (*switched_to) (struct rq *this_rq, struct task_struct *task);
|
|
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
|
|
int oldprio);
|
|
|
|
unsigned int (*get_rr_interval) (struct rq *rq,
|
|
struct task_struct *task);
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
void (*task_move_group) (struct task_struct *p, int on_rq);
|
|
#endif
|
|
};
|
|
|
|
struct load_weight {
|
|
unsigned long weight, inv_weight;
|
|
};
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
struct sched_statistics {
|
|
u64 wait_start;
|
|
u64 wait_max;
|
|
u64 wait_count;
|
|
u64 wait_sum;
|
|
u64 iowait_count;
|
|
u64 iowait_sum;
|
|
|
|
u64 sleep_start;
|
|
u64 sleep_max;
|
|
s64 sum_sleep_runtime;
|
|
|
|
u64 block_start;
|
|
u64 block_max;
|
|
u64 exec_max;
|
|
u64 slice_max;
|
|
|
|
u64 nr_migrations_cold;
|
|
u64 nr_failed_migrations_affine;
|
|
u64 nr_failed_migrations_running;
|
|
u64 nr_failed_migrations_hot;
|
|
u64 nr_forced_migrations;
|
|
|
|
u64 nr_wakeups;
|
|
u64 nr_wakeups_sync;
|
|
u64 nr_wakeups_migrate;
|
|
u64 nr_wakeups_local;
|
|
u64 nr_wakeups_remote;
|
|
u64 nr_wakeups_affine;
|
|
u64 nr_wakeups_affine_attempts;
|
|
u64 nr_wakeups_passive;
|
|
u64 nr_wakeups_idle;
|
|
};
|
|
#endif
|
|
|
|
struct sched_entity {
|
|
struct load_weight load; /* for load-balancing */
|
|
struct rb_node run_node;
|
|
struct list_head group_node;
|
|
unsigned int on_rq;
|
|
|
|
u64 exec_start;
|
|
u64 sum_exec_runtime;
|
|
u64 vruntime;
|
|
u64 prev_sum_exec_runtime;
|
|
|
|
u64 nr_migrations;
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
struct sched_statistics statistics;
|
|
#endif
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
struct sched_entity *parent;
|
|
/* rq on which this entity is (to be) queued: */
|
|
struct cfs_rq *cfs_rq;
|
|
/* rq "owned" by this entity/group: */
|
|
struct cfs_rq *my_q;
|
|
#endif
|
|
};
|
|
|
|
struct sched_rt_entity {
|
|
struct list_head run_list;
|
|
unsigned long timeout;
|
|
unsigned int time_slice;
|
|
|
|
struct sched_rt_entity *back;
|
|
#ifdef CONFIG_RT_GROUP_SCHED
|
|
struct sched_rt_entity *parent;
|
|
/* rq on which this entity is (to be) queued: */
|
|
struct rt_rq *rt_rq;
|
|
/* rq "owned" by this entity/group: */
|
|
struct rt_rq *my_q;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* default timeslice is 100 msecs (used only for SCHED_RR tasks).
|
|
* Timeslices get refilled after they expire.
|
|
*/
|
|
#define RR_TIMESLICE (100 * HZ / 1000)
|
|
|
|
struct rcu_node;
|
|
|
|
enum perf_event_task_context {
|
|
perf_invalid_context = -1,
|
|
perf_hw_context = 0,
|
|
perf_sw_context,
|
|
perf_nr_task_contexts,
|
|
};
|
|
|
|
struct task_struct {
|
|
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
|
|
void *stack;
|
|
atomic_t usage;
|
|
unsigned int flags; /* per process flags, defined below */
|
|
unsigned int ptrace;
|
|
|
|
#ifdef CONFIG_SMP
|
|
struct llist_node wake_entry;
|
|
int on_cpu;
|
|
#endif
|
|
int on_rq;
|
|
|
|
int prio, static_prio, normal_prio;
|
|
unsigned int rt_priority;
|
|
const struct sched_class *sched_class;
|
|
struct sched_entity se;
|
|
struct sched_rt_entity rt;
|
|
#ifdef CONFIG_CGROUP_SCHED
|
|
struct task_group *sched_task_group;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PREEMPT_NOTIFIERS
|
|
/* list of struct preempt_notifier: */
|
|
struct hlist_head preempt_notifiers;
|
|
#endif
|
|
|
|
/*
|
|
* fpu_counter contains the number of consecutive context switches
|
|
* that the FPU is used. If this is over a threshold, the lazy fpu
|
|
* saving becomes unlazy to save the trap. This is an unsigned char
|
|
* so that after 256 times the counter wraps and the behavior turns
|
|
* lazy again; this to deal with bursty apps that only use FPU for
|
|
* a short time
|
|
*/
|
|
unsigned char fpu_counter;
|
|
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
|
unsigned int btrace_seq;
|
|
#endif
|
|
|
|
unsigned int policy;
|
|
int nr_cpus_allowed;
|
|
cpumask_t cpus_allowed;
|
|
|
|
#ifdef CONFIG_PREEMPT_RCU
|
|
int rcu_read_lock_nesting;
|
|
char rcu_read_unlock_special;
|
|
struct list_head rcu_node_entry;
|
|
#endif /* #ifdef CONFIG_PREEMPT_RCU */
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
struct rcu_node *rcu_blocked_node;
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
#ifdef CONFIG_RCU_BOOST
|
|
struct rt_mutex *rcu_boost_mutex;
|
|
#endif /* #ifdef CONFIG_RCU_BOOST */
|
|
|
|
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
|
|
struct sched_info sched_info;
|
|
#endif
|
|
|
|
struct list_head tasks;
|
|
#ifdef CONFIG_SMP
|
|
struct plist_node pushable_tasks;
|
|
#endif
|
|
|
|
struct mm_struct *mm, *active_mm;
|
|
#ifdef CONFIG_COMPAT_BRK
|
|
unsigned brk_randomized:1;
|
|
#endif
|
|
#if defined(SPLIT_RSS_COUNTING)
|
|
struct task_rss_stat rss_stat;
|
|
#endif
|
|
/* task state */
|
|
int exit_state;
|
|
int exit_code, exit_signal;
|
|
int pdeath_signal; /* The signal sent when the parent dies */
|
|
unsigned int jobctl; /* JOBCTL_*, siglock protected */
|
|
/* ??? */
|
|
unsigned int personality;
|
|
unsigned did_exec:1;
|
|
unsigned in_execve:1; /* Tell the LSMs that the process is doing an
|
|
* execve */
|
|
unsigned in_iowait:1;
|
|
|
|
/* task may not gain privileges */
|
|
unsigned no_new_privs:1;
|
|
|
|
/* Revert to default priority/policy when forking */
|
|
unsigned sched_reset_on_fork:1;
|
|
unsigned sched_contributes_to_load:1;
|
|
|
|
pid_t pid;
|
|
pid_t tgid;
|
|
|
|
#ifdef CONFIG_CC_STACKPROTECTOR
|
|
/* Canary value for the -fstack-protector gcc feature */
|
|
unsigned long stack_canary;
|
|
#endif
|
|
/*
|
|
* pointers to (original) parent process, youngest child, younger sibling,
|
|
* older sibling, respectively. (p->father can be replaced with
|
|
* p->real_parent->pid)
|
|
*/
|
|
struct task_struct __rcu *real_parent; /* real parent process */
|
|
struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
|
|
/*
|
|
* children/sibling forms the list of my natural children
|
|
*/
|
|
struct list_head children; /* list of my children */
|
|
struct list_head sibling; /* linkage in my parent's children list */
|
|
struct task_struct *group_leader; /* threadgroup leader */
|
|
|
|
/*
|
|
* ptraced is the list of tasks this task is using ptrace on.
|
|
* This includes both natural children and PTRACE_ATTACH targets.
|
|
* p->ptrace_entry is p's link on the p->parent->ptraced list.
|
|
*/
|
|
struct list_head ptraced;
|
|
struct list_head ptrace_entry;
|
|
|
|
/* PID/PID hash table linkage. */
|
|
struct pid_link pids[PIDTYPE_MAX];
|
|
struct list_head thread_group;
|
|
|
|
struct completion *vfork_done; /* for vfork() */
|
|
int __user *set_child_tid; /* CLONE_CHILD_SETTID */
|
|
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
|
|
|
|
cputime_t utime, stime, utimescaled, stimescaled;
|
|
cputime_t gtime;
|
|
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
|
|
cputime_t prev_utime, prev_stime;
|
|
#endif
|
|
unsigned long nvcsw, nivcsw; /* context switch counts */
|
|
struct timespec start_time; /* monotonic time */
|
|
struct timespec real_start_time; /* boot based time */
|
|
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
|
|
unsigned long min_flt, maj_flt;
|
|
|
|
struct task_cputime cputime_expires;
|
|
struct list_head cpu_timers[3];
|
|
|
|
/* process credentials */
|
|
const struct cred __rcu *real_cred; /* objective and real subjective task
|
|
* credentials (COW) */
|
|
const struct cred __rcu *cred; /* effective (overridable) subjective task
|
|
* credentials (COW) */
|
|
char comm[TASK_COMM_LEN]; /* executable name excluding path
|
|
- access with [gs]et_task_comm (which lock
|
|
it with task_lock())
|
|
- initialized normally by setup_new_exec */
|
|
/* file system info */
|
|
int link_count, total_link_count;
|
|
#ifdef CONFIG_SYSVIPC
|
|
/* ipc stuff */
|
|
struct sysv_sem sysvsem;
|
|
#endif
|
|
#ifdef CONFIG_DETECT_HUNG_TASK
|
|
/* hung task detection */
|
|
unsigned long last_switch_count;
|
|
#endif
|
|
/* CPU-specific state of this task */
|
|
struct thread_struct thread;
|
|
/* filesystem information */
|
|
struct fs_struct *fs;
|
|
/* open file information */
|
|
struct files_struct *files;
|
|
/* namespaces */
|
|
struct nsproxy *nsproxy;
|
|
/* signal handlers */
|
|
struct signal_struct *signal;
|
|
struct sighand_struct *sighand;
|
|
|
|
sigset_t blocked, real_blocked;
|
|
sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
|
|
struct sigpending pending;
|
|
|
|
unsigned long sas_ss_sp;
|
|
size_t sas_ss_size;
|
|
int (*notifier)(void *priv);
|
|
void *notifier_data;
|
|
sigset_t *notifier_mask;
|
|
struct callback_head *task_works;
|
|
|
|
struct audit_context *audit_context;
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
uid_t loginuid;
|
|
unsigned int sessionid;
|
|
#endif
|
|
struct seccomp seccomp;
|
|
|
|
/* Thread group tracking */
|
|
u32 parent_exec_id;
|
|
u32 self_exec_id;
|
|
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
|
|
* mempolicy */
|
|
spinlock_t alloc_lock;
|
|
|
|
/* Protection of the PI data structures: */
|
|
raw_spinlock_t pi_lock;
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
/* PI waiters blocked on a rt_mutex held by this task */
|
|
struct plist_head pi_waiters;
|
|
/* Deadlock detection and priority inheritance handling */
|
|
struct rt_mutex_waiter *pi_blocked_on;
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_MUTEXES
|
|
/* mutex deadlock detection */
|
|
struct mutex_waiter *blocked_on;
|
|
#endif
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
unsigned int irq_events;
|
|
unsigned long hardirq_enable_ip;
|
|
unsigned long hardirq_disable_ip;
|
|
unsigned int hardirq_enable_event;
|
|
unsigned int hardirq_disable_event;
|
|
int hardirqs_enabled;
|
|
int hardirq_context;
|
|
unsigned long softirq_disable_ip;
|
|
unsigned long softirq_enable_ip;
|
|
unsigned int softirq_disable_event;
|
|
unsigned int softirq_enable_event;
|
|
int softirqs_enabled;
|
|
int softirq_context;
|
|
#endif
|
|
#ifdef CONFIG_LOCKDEP
|
|
# define MAX_LOCK_DEPTH 48UL
|
|
u64 curr_chain_key;
|
|
int lockdep_depth;
|
|
unsigned int lockdep_recursion;
|
|
struct held_lock held_locks[MAX_LOCK_DEPTH];
|
|
gfp_t lockdep_reclaim_gfp;
|
|
#endif
|
|
|
|
/* journalling filesystem info */
|
|
void *journal_info;
|
|
|
|
/* stacked block device info */
|
|
struct bio_list *bio_list;
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
/* stack plugging */
|
|
struct blk_plug *plug;
|
|
#endif
|
|
|
|
/* VM state */
|
|
struct reclaim_state *reclaim_state;
|
|
|
|
struct backing_dev_info *backing_dev_info;
|
|
|
|
struct io_context *io_context;
|
|
|
|
unsigned long ptrace_message;
|
|
siginfo_t *last_siginfo; /* For ptrace use. */
|
|
struct task_io_accounting ioac;
|
|
#if defined(CONFIG_TASK_XACCT)
|
|
u64 acct_rss_mem1; /* accumulated rss usage */
|
|
u64 acct_vm_mem1; /* accumulated virtual memory usage */
|
|
cputime_t acct_timexpd; /* stime + utime since last update */
|
|
#endif
|
|
#ifdef CONFIG_CPUSETS
|
|
nodemask_t mems_allowed; /* Protected by alloc_lock */
|
|
seqcount_t mems_allowed_seq; /* Seqence no to catch updates */
|
|
int cpuset_mem_spread_rotor;
|
|
int cpuset_slab_spread_rotor;
|
|
#endif
|
|
#ifdef CONFIG_CGROUPS
|
|
/* Control Group info protected by css_set_lock */
|
|
struct css_set __rcu *cgroups;
|
|
/* cg_list protected by css_set_lock and tsk->alloc_lock */
|
|
struct list_head cg_list;
|
|
#endif
|
|
#ifdef CONFIG_FUTEX
|
|
struct robust_list_head __user *robust_list;
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_robust_list_head __user *compat_robust_list;
|
|
#endif
|
|
struct list_head pi_state_list;
|
|
struct futex_pi_state *pi_state_cache;
|
|
#endif
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
|
|
struct mutex perf_event_mutex;
|
|
struct list_head perf_event_list;
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
struct mempolicy *mempolicy; /* Protected by alloc_lock */
|
|
short il_next;
|
|
short pref_node_fork;
|
|
#endif
|
|
struct rcu_head rcu;
|
|
|
|
/*
|
|
* cache last used pipe for splice
|
|
*/
|
|
struct pipe_inode_info *splice_pipe;
|
|
#ifdef CONFIG_TASK_DELAY_ACCT
|
|
struct task_delay_info *delays;
|
|
#endif
|
|
#ifdef CONFIG_FAULT_INJECTION
|
|
int make_it_fail;
|
|
#endif
|
|
/*
|
|
* when (nr_dirtied >= nr_dirtied_pause), it's time to call
|
|
* balance_dirty_pages() for some dirty throttling pause
|
|
*/
|
|
int nr_dirtied;
|
|
int nr_dirtied_pause;
|
|
unsigned long dirty_paused_when; /* start of a write-and-pause period */
|
|
|
|
#ifdef CONFIG_LATENCYTOP
|
|
int latency_record_count;
|
|
struct latency_record latency_record[LT_SAVECOUNT];
|
|
#endif
|
|
/*
|
|
* time slack values; these are used to round up poll() and
|
|
* select() etc timeout values. These are in nanoseconds.
|
|
*/
|
|
unsigned long timer_slack_ns;
|
|
unsigned long default_timer_slack_ns;
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
/* Index of current stored address in ret_stack */
|
|
int curr_ret_stack;
|
|
/* Stack of return addresses for return function tracing */
|
|
struct ftrace_ret_stack *ret_stack;
|
|
/* time stamp for last schedule */
|
|
unsigned long long ftrace_timestamp;
|
|
/*
|
|
* Number of functions that haven't been traced
|
|
* because of depth overrun.
|
|
*/
|
|
atomic_t trace_overrun;
|
|
/* Pause for the tracing */
|
|
atomic_t tracing_graph_pause;
|
|
#endif
|
|
#ifdef CONFIG_TRACING
|
|
/* state flags for use by tracers */
|
|
unsigned long trace;
|
|
/* bitmask and counter of trace recursion */
|
|
unsigned long trace_recursion;
|
|
#endif /* CONFIG_TRACING */
|
|
#ifdef CONFIG_MEMCG /* memcg uses this to do batch job */
|
|
struct memcg_batch_info {
|
|
int do_batch; /* incremented when batch uncharge started */
|
|
struct mem_cgroup *memcg; /* target memcg of uncharge */
|
|
unsigned long nr_pages; /* uncharged usage */
|
|
unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
|
|
} memcg_batch;
|
|
#endif
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
atomic_t ptrace_bp_refcnt;
|
|
#endif
|
|
#ifdef CONFIG_UPROBES
|
|
struct uprobe_task *utask;
|
|
#endif
|
|
};
|
|
|
|
/* Future-safe accessor for struct task_struct's cpus_allowed. */
|
|
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
|
|
|
|
/*
|
|
* Priority of a process goes from 0..MAX_PRIO-1, valid RT
|
|
* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
|
|
* tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
|
|
* values are inverted: lower p->prio value means higher priority.
|
|
*
|
|
* The MAX_USER_RT_PRIO value allows the actual maximum
|
|
* RT priority to be separate from the value exported to
|
|
* user-space. This allows kernel threads to set their
|
|
* priority to a value higher than any user task. Note:
|
|
* MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
|
|
*/
|
|
|
|
#define MAX_USER_RT_PRIO 100
|
|
#define MAX_RT_PRIO MAX_USER_RT_PRIO
|
|
|
|
#define MAX_PRIO (MAX_RT_PRIO + 40)
|
|
#define DEFAULT_PRIO (MAX_RT_PRIO + 20)
|
|
|
|
static inline int rt_prio(int prio)
|
|
{
|
|
if (unlikely(prio < MAX_RT_PRIO))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline int rt_task(struct task_struct *p)
|
|
{
|
|
return rt_prio(p->prio);
|
|
}
|
|
|
|
static inline struct pid *task_pid(struct task_struct *task)
|
|
{
|
|
return task->pids[PIDTYPE_PID].pid;
|
|
}
|
|
|
|
static inline struct pid *task_tgid(struct task_struct *task)
|
|
{
|
|
return task->group_leader->pids[PIDTYPE_PID].pid;
|
|
}
|
|
|
|
/*
|
|
* Without tasklist or rcu lock it is not safe to dereference
|
|
* the result of task_pgrp/task_session even if task == current,
|
|
* we can race with another thread doing sys_setsid/sys_setpgid.
|
|
*/
|
|
static inline struct pid *task_pgrp(struct task_struct *task)
|
|
{
|
|
return task->group_leader->pids[PIDTYPE_PGID].pid;
|
|
}
|
|
|
|
static inline struct pid *task_session(struct task_struct *task)
|
|
{
|
|
return task->group_leader->pids[PIDTYPE_SID].pid;
|
|
}
|
|
|
|
struct pid_namespace;
|
|
|
|
/*
|
|
* the helpers to get the task's different pids as they are seen
|
|
* from various namespaces
|
|
*
|
|
* task_xid_nr() : global id, i.e. the id seen from the init namespace;
|
|
* task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of
|
|
* current.
|
|
* task_xid_nr_ns() : id seen from the ns specified;
|
|
*
|
|
* set_task_vxid() : assigns a virtual id to a task;
|
|
*
|
|
* see also pid_nr() etc in include/linux/pid.h
|
|
*/
|
|
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
|
|
struct pid_namespace *ns);
|
|
|
|
static inline pid_t task_pid_nr(struct task_struct *tsk)
|
|
{
|
|
return tsk->pid;
|
|
}
|
|
|
|
static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
|
|
struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
|
|
}
|
|
|
|
static inline pid_t task_pid_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
|
|
}
|
|
|
|
|
|
static inline pid_t task_tgid_nr(struct task_struct *tsk)
|
|
{
|
|
return tsk->tgid;
|
|
}
|
|
|
|
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
|
|
|
|
static inline pid_t task_tgid_vnr(struct task_struct *tsk)
|
|
{
|
|
return pid_vnr(task_tgid(tsk));
|
|
}
|
|
|
|
|
|
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
|
|
struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
|
|
}
|
|
|
|
static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
|
|
}
|
|
|
|
|
|
static inline pid_t task_session_nr_ns(struct task_struct *tsk,
|
|
struct pid_namespace *ns)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
|
|
}
|
|
|
|
static inline pid_t task_session_vnr(struct task_struct *tsk)
|
|
{
|
|
return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
|
|
}
|
|
|
|
/* obsolete, do not use */
|
|
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
|
|
{
|
|
return task_pgrp_nr_ns(tsk, &init_pid_ns);
|
|
}
|
|
|
|
/**
|
|
* pid_alive - check that a task structure is not stale
|
|
* @p: Task structure to be checked.
|
|
*
|
|
* Test if a process is not yet dead (at most zombie state)
|
|
* If pid_alive fails, then pointers within the task structure
|
|
* can be stale and must not be dereferenced.
|
|
*/
|
|
static inline int pid_alive(struct task_struct *p)
|
|
{
|
|
return p->pids[PIDTYPE_PID].pid != NULL;
|
|
}
|
|
|
|
/**
|
|
* is_global_init - check if a task structure is init
|
|
* @tsk: Task structure to be checked.
|
|
*
|
|
* Check if a task structure is the first user space task the kernel created.
|
|
*/
|
|
static inline int is_global_init(struct task_struct *tsk)
|
|
{
|
|
return tsk->pid == 1;
|
|
}
|
|
|
|
/*
|
|
* is_container_init:
|
|
* check whether in the task is init in its own pid namespace.
|
|
*/
|
|
extern int is_container_init(struct task_struct *tsk);
|
|
|
|
extern struct pid *cad_pid;
|
|
|
|
extern void free_task(struct task_struct *tsk);
|
|
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
|
|
|
|
extern void __put_task_struct(struct task_struct *t);
|
|
|
|
static inline void put_task_struct(struct task_struct *t)
|
|
{
|
|
if (atomic_dec_and_test(&t->usage))
|
|
__put_task_struct(t);
|
|
}
|
|
|
|
extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
|
|
extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
|
|
|
|
/*
|
|
* Per process flags
|
|
*/
|
|
#define PF_EXITING 0x00000004 /* getting shut down */
|
|
#define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */
|
|
#define PF_VCPU 0x00000010 /* I'm a virtual CPU */
|
|
#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
|
|
#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
|
|
#define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */
|
|
#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
|
|
#define PF_DUMPCORE 0x00000200 /* dumped core */
|
|
#define PF_SIGNALED 0x00000400 /* killed by a signal */
|
|
#define PF_MEMALLOC 0x00000800 /* Allocating memory */
|
|
#define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */
|
|
#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
|
|
#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
|
|
#define PF_FROZEN 0x00010000 /* frozen for system suspend */
|
|
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
|
|
#define PF_KSWAPD 0x00040000 /* I am kswapd */
|
|
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
|
|
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
|
|
#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */
|
|
#define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
|
|
#define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
|
|
#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
|
|
#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
|
|
#define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
|
|
#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
|
|
#define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
|
|
#define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */
|
|
|
|
/*
|
|
* Only the _current_ task can read/write to tsk->flags, but other
|
|
* tasks can access tsk->flags in readonly mode for example
|
|
* with tsk_used_math (like during threaded core dumping).
|
|
* There is however an exception to this rule during ptrace
|
|
* or during fork: the ptracer task is allowed to write to the
|
|
* child->flags of its traced child (same goes for fork, the parent
|
|
* can write to the child->flags), because we're guaranteed the
|
|
* child is not running and in turn not changing child->flags
|
|
* at the same time the parent does it.
|
|
*/
|
|
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
|
|
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
|
|
#define clear_used_math() clear_stopped_child_used_math(current)
|
|
#define set_used_math() set_stopped_child_used_math(current)
|
|
#define conditional_stopped_child_used_math(condition, child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
|
|
#define conditional_used_math(condition) \
|
|
conditional_stopped_child_used_math(condition, current)
|
|
#define copy_to_stopped_child_used_math(child) \
|
|
do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
|
|
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
|
|
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
|
|
#define used_math() tsk_used_math(current)
|
|
|
|
/*
|
|
* task->jobctl flags
|
|
*/
|
|
#define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
|
|
|
|
#define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
|
|
#define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
|
|
#define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
|
|
#define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
|
|
#define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
|
|
#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
|
|
#define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
|
|
|
|
#define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
|
|
#define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
|
|
#define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
|
|
#define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
|
|
#define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
|
|
#define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
|
|
#define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT)
|
|
|
|
#define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
|
|
#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
|
|
|
|
extern bool task_set_jobctl_pending(struct task_struct *task,
|
|
unsigned int mask);
|
|
extern void task_clear_jobctl_trapping(struct task_struct *task);
|
|
extern void task_clear_jobctl_pending(struct task_struct *task,
|
|
unsigned int mask);
|
|
|
|
#ifdef CONFIG_PREEMPT_RCU
|
|
|
|
#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
|
|
#define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
|
|
|
|
static inline void rcu_copy_process(struct task_struct *p)
|
|
{
|
|
p->rcu_read_lock_nesting = 0;
|
|
p->rcu_read_unlock_special = 0;
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
p->rcu_blocked_node = NULL;
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
#ifdef CONFIG_RCU_BOOST
|
|
p->rcu_boost_mutex = NULL;
|
|
#endif /* #ifdef CONFIG_RCU_BOOST */
|
|
INIT_LIST_HEAD(&p->rcu_node_entry);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void rcu_copy_process(struct task_struct *p)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline void tsk_restore_flags(struct task_struct *task,
|
|
unsigned long orig_flags, unsigned long flags)
|
|
{
|
|
task->flags &= ~flags;
|
|
task->flags |= orig_flags & flags;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void do_set_cpus_allowed(struct task_struct *p,
|
|
const struct cpumask *new_mask);
|
|
|
|
extern int set_cpus_allowed_ptr(struct task_struct *p,
|
|
const struct cpumask *new_mask);
|
|
#else
|
|
static inline void do_set_cpus_allowed(struct task_struct *p,
|
|
const struct cpumask *new_mask)
|
|
{
|
|
}
|
|
static inline int set_cpus_allowed_ptr(struct task_struct *p,
|
|
const struct cpumask *new_mask)
|
|
{
|
|
if (!cpumask_test_cpu(0, new_mask))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NO_HZ
|
|
void calc_load_enter_idle(void);
|
|
void calc_load_exit_idle(void);
|
|
#else
|
|
static inline void calc_load_enter_idle(void) { }
|
|
static inline void calc_load_exit_idle(void) { }
|
|
#endif /* CONFIG_NO_HZ */
|
|
|
|
#ifndef CONFIG_CPUMASK_OFFSTACK
|
|
static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
|
|
{
|
|
return set_cpus_allowed_ptr(p, &new_mask);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Do not use outside of architecture code which knows its limitations.
|
|
*
|
|
* sched_clock() has no promise of monotonicity or bounded drift between
|
|
* CPUs, use (which you should not) requires disabling IRQs.
|
|
*
|
|
* Please use one of the three interfaces below.
|
|
*/
|
|
extern unsigned long long notrace sched_clock(void);
|
|
/*
|
|
* See the comment in kernel/sched/clock.c
|
|
*/
|
|
extern u64 cpu_clock(int cpu);
|
|
extern u64 local_clock(void);
|
|
extern u64 sched_clock_cpu(int cpu);
|
|
|
|
|
|
extern void sched_clock_init(void);
|
|
|
|
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
|
|
static inline void sched_clock_tick(void)
|
|
{
|
|
}
|
|
|
|
static inline void sched_clock_idle_sleep_event(void)
|
|
{
|
|
}
|
|
|
|
static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
|
|
{
|
|
}
|
|
#else
|
|
/*
|
|
* Architectures can set this to 1 if they have specified
|
|
* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
|
|
* but then during bootup it turns out that sched_clock()
|
|
* is reliable after all:
|
|
*/
|
|
extern int sched_clock_stable;
|
|
|
|
extern void sched_clock_tick(void);
|
|
extern void sched_clock_idle_sleep_event(void);
|
|
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
|
|
#endif
|
|
|
|
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
|
/*
|
|
* An i/f to runtime opt-in for irq time accounting based off of sched_clock.
|
|
* The reason for this explicit opt-in is not to have perf penalty with
|
|
* slow sched_clocks.
|
|
*/
|
|
extern void enable_sched_clock_irqtime(void);
|
|
extern void disable_sched_clock_irqtime(void);
|
|
#else
|
|
static inline void enable_sched_clock_irqtime(void) {}
|
|
static inline void disable_sched_clock_irqtime(void) {}
|
|
#endif
|
|
|
|
extern unsigned long long
|
|
task_sched_runtime(struct task_struct *task);
|
|
|
|
/* sched_exec is called by processes performing an exec */
|
|
#ifdef CONFIG_SMP
|
|
extern void sched_exec(void);
|
|
#else
|
|
#define sched_exec() {}
|
|
#endif
|
|
|
|
extern void sched_clock_idle_sleep_event(void);
|
|
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void idle_task_exit(void);
|
|
#else
|
|
static inline void idle_task_exit(void) {}
|
|
#endif
|
|
|
|
#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
|
|
extern void wake_up_idle_cpu(int cpu);
|
|
#else
|
|
static inline void wake_up_idle_cpu(int cpu) { }
|
|
#endif
|
|
|
|
extern unsigned int sysctl_sched_latency;
|
|
extern unsigned int sysctl_sched_min_granularity;
|
|
extern unsigned int sysctl_sched_wakeup_granularity;
|
|
extern unsigned int sysctl_sched_child_runs_first;
|
|
|
|
enum sched_tunable_scaling {
|
|
SCHED_TUNABLESCALING_NONE,
|
|
SCHED_TUNABLESCALING_LOG,
|
|
SCHED_TUNABLESCALING_LINEAR,
|
|
SCHED_TUNABLESCALING_END,
|
|
};
|
|
extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
extern unsigned int sysctl_sched_migration_cost;
|
|
extern unsigned int sysctl_sched_nr_migrate;
|
|
extern unsigned int sysctl_sched_time_avg;
|
|
extern unsigned int sysctl_timer_migration;
|
|
extern unsigned int sysctl_sched_shares_window;
|
|
|
|
int sched_proc_update_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *length,
|
|
loff_t *ppos);
|
|
#endif
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
static inline unsigned int get_sysctl_timer_migration(void)
|
|
{
|
|
return sysctl_timer_migration;
|
|
}
|
|
#else
|
|
static inline unsigned int get_sysctl_timer_migration(void)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
extern unsigned int sysctl_sched_rt_period;
|
|
extern int sysctl_sched_rt_runtime;
|
|
|
|
int sched_rt_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp,
|
|
loff_t *ppos);
|
|
|
|
#ifdef CONFIG_SCHED_AUTOGROUP
|
|
extern unsigned int sysctl_sched_autogroup_enabled;
|
|
|
|
extern void sched_autogroup_create_attach(struct task_struct *p);
|
|
extern void sched_autogroup_detach(struct task_struct *p);
|
|
extern void sched_autogroup_fork(struct signal_struct *sig);
|
|
extern void sched_autogroup_exit(struct signal_struct *sig);
|
|
#ifdef CONFIG_PROC_FS
|
|
extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
|
|
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
|
|
#endif
|
|
#else
|
|
static inline void sched_autogroup_create_attach(struct task_struct *p) { }
|
|
static inline void sched_autogroup_detach(struct task_struct *p) { }
|
|
static inline void sched_autogroup_fork(struct signal_struct *sig) { }
|
|
static inline void sched_autogroup_exit(struct signal_struct *sig) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_CFS_BANDWIDTH
|
|
extern unsigned int sysctl_sched_cfs_bandwidth_slice;
|
|
#endif
|
|
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
extern int rt_mutex_getprio(struct task_struct *p);
|
|
extern void rt_mutex_setprio(struct task_struct *p, int prio);
|
|
extern void rt_mutex_adjust_pi(struct task_struct *p);
|
|
static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
|
|
{
|
|
return tsk->pi_blocked_on != NULL;
|
|
}
|
|
#else
|
|
static inline int rt_mutex_getprio(struct task_struct *p)
|
|
{
|
|
return p->normal_prio;
|
|
}
|
|
# define rt_mutex_adjust_pi(p) do { } while (0)
|
|
static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
extern bool yield_to(struct task_struct *p, bool preempt);
|
|
extern void set_user_nice(struct task_struct *p, long nice);
|
|
extern int task_prio(const struct task_struct *p);
|
|
extern int task_nice(const struct task_struct *p);
|
|
extern int can_nice(const struct task_struct *p, const int nice);
|
|
extern int task_curr(const struct task_struct *p);
|
|
extern int idle_cpu(int cpu);
|
|
extern int sched_setscheduler(struct task_struct *, int,
|
|
const struct sched_param *);
|
|
extern int sched_setscheduler_nocheck(struct task_struct *, int,
|
|
const struct sched_param *);
|
|
extern struct task_struct *idle_task(int cpu);
|
|
/**
|
|
* is_idle_task - is the specified task an idle task?
|
|
* @p: the task in question.
|
|
*/
|
|
static inline bool is_idle_task(const struct task_struct *p)
|
|
{
|
|
return p->pid == 0;
|
|
}
|
|
extern struct task_struct *curr_task(int cpu);
|
|
extern void set_curr_task(int cpu, struct task_struct *p);
|
|
|
|
void yield(void);
|
|
|
|
/*
|
|
* The default (Linux) execution domain.
|
|
*/
|
|
extern struct exec_domain default_exec_domain;
|
|
|
|
union thread_union {
|
|
struct thread_info thread_info;
|
|
unsigned long stack[THREAD_SIZE/sizeof(long)];
|
|
};
|
|
|
|
#ifndef __HAVE_ARCH_KSTACK_END
|
|
static inline int kstack_end(void *addr)
|
|
{
|
|
/* Reliable end of stack detection:
|
|
* Some APM bios versions misalign the stack
|
|
*/
|
|
return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
|
|
}
|
|
#endif
|
|
|
|
extern union thread_union init_thread_union;
|
|
extern struct task_struct init_task;
|
|
|
|
extern struct mm_struct init_mm;
|
|
|
|
extern struct pid_namespace init_pid_ns;
|
|
|
|
/*
|
|
* find a task by one of its numerical ids
|
|
*
|
|
* find_task_by_pid_ns():
|
|
* finds a task by its pid in the specified namespace
|
|
* find_task_by_vpid():
|
|
* finds a task by its virtual pid
|
|
*
|
|
* see also find_vpid() etc in include/linux/pid.h
|
|
*/
|
|
|
|
extern struct task_struct *find_task_by_vpid(pid_t nr);
|
|
extern struct task_struct *find_task_by_pid_ns(pid_t nr,
|
|
struct pid_namespace *ns);
|
|
|
|
extern void __set_special_pids(struct pid *pid);
|
|
|
|
/* per-UID process charging. */
|
|
extern struct user_struct * alloc_uid(kuid_t);
|
|
static inline struct user_struct *get_uid(struct user_struct *u)
|
|
{
|
|
atomic_inc(&u->__count);
|
|
return u;
|
|
}
|
|
extern void free_uid(struct user_struct *);
|
|
|
|
#include <asm/current.h>
|
|
|
|
extern void xtime_update(unsigned long ticks);
|
|
|
|
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
|
|
extern int wake_up_process(struct task_struct *tsk);
|
|
extern void wake_up_new_task(struct task_struct *tsk);
|
|
#ifdef CONFIG_SMP
|
|
extern void kick_process(struct task_struct *tsk);
|
|
#else
|
|
static inline void kick_process(struct task_struct *tsk) { }
|
|
#endif
|
|
extern void sched_fork(struct task_struct *p);
|
|
extern void sched_dead(struct task_struct *p);
|
|
|
|
extern void proc_caches_init(void);
|
|
extern void flush_signals(struct task_struct *);
|
|
extern void __flush_signals(struct task_struct *);
|
|
extern void ignore_signals(struct task_struct *);
|
|
extern void flush_signal_handlers(struct task_struct *, int force_default);
|
|
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
|
|
|
|
static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&tsk->sighand->siglock, flags);
|
|
ret = dequeue_signal(tsk, mask, info);
|
|
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
extern void block_all_signals(int (*notifier)(void *priv), void *priv,
|
|
sigset_t *mask);
|
|
extern void unblock_all_signals(void);
|
|
extern void release_task(struct task_struct * p);
|
|
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int force_sigsegv(int, struct task_struct *);
|
|
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
|
|
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
|
|
extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
|
|
extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
|
|
const struct cred *, u32);
|
|
extern int kill_pgrp(struct pid *pid, int sig, int priv);
|
|
extern int kill_pid(struct pid *pid, int sig, int priv);
|
|
extern int kill_proc_info(int, struct siginfo *, pid_t);
|
|
extern __must_check bool do_notify_parent(struct task_struct *, int);
|
|
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
|
|
extern void force_sig(int, struct task_struct *);
|
|
extern int send_sig(int, struct task_struct *, int);
|
|
extern int zap_other_threads(struct task_struct *p);
|
|
extern struct sigqueue *sigqueue_alloc(void);
|
|
extern void sigqueue_free(struct sigqueue *);
|
|
extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
|
|
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
|
|
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
|
|
|
|
static inline void restore_saved_sigmask(void)
|
|
{
|
|
if (test_and_clear_restore_sigmask())
|
|
__set_current_blocked(¤t->saved_sigmask);
|
|
}
|
|
|
|
static inline sigset_t *sigmask_to_save(void)
|
|
{
|
|
sigset_t *res = ¤t->blocked;
|
|
if (unlikely(test_restore_sigmask()))
|
|
res = ¤t->saved_sigmask;
|
|
return res;
|
|
}
|
|
|
|
static inline int kill_cad_pid(int sig, int priv)
|
|
{
|
|
return kill_pid(cad_pid, sig, priv);
|
|
}
|
|
|
|
/* These can be the second arg to send_sig_info/send_group_sig_info. */
|
|
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
|
|
#define SEND_SIG_PRIV ((struct siginfo *) 1)
|
|
#define SEND_SIG_FORCED ((struct siginfo *) 2)
|
|
|
|
/*
|
|
* True if we are on the alternate signal stack.
|
|
*/
|
|
static inline int on_sig_stack(unsigned long sp)
|
|
{
|
|
#ifdef CONFIG_STACK_GROWSUP
|
|
return sp >= current->sas_ss_sp &&
|
|
sp - current->sas_ss_sp < current->sas_ss_size;
|
|
#else
|
|
return sp > current->sas_ss_sp &&
|
|
sp - current->sas_ss_sp <= current->sas_ss_size;
|
|
#endif
|
|
}
|
|
|
|
static inline int sas_ss_flags(unsigned long sp)
|
|
{
|
|
return (current->sas_ss_size == 0 ? SS_DISABLE
|
|
: on_sig_stack(sp) ? SS_ONSTACK : 0);
|
|
}
|
|
|
|
/*
|
|
* Routines for handling mm_structs
|
|
*/
|
|
extern struct mm_struct * mm_alloc(void);
|
|
|
|
/* mmdrop drops the mm and the page tables */
|
|
extern void __mmdrop(struct mm_struct *);
|
|
static inline void mmdrop(struct mm_struct * mm)
|
|
{
|
|
if (unlikely(atomic_dec_and_test(&mm->mm_count)))
|
|
__mmdrop(mm);
|
|
}
|
|
|
|
/* mmput gets rid of the mappings and all user-space */
|
|
extern void mmput(struct mm_struct *);
|
|
/* Grab a reference to a task's mm, if it is not already going away */
|
|
extern struct mm_struct *get_task_mm(struct task_struct *task);
|
|
/*
|
|
* Grab a reference to a task's mm, if it is not already going away
|
|
* and ptrace_may_access with the mode parameter passed to it
|
|
* succeeds.
|
|
*/
|
|
extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
|
|
/* Remove the current tasks stale references to the old mm_struct */
|
|
extern void mm_release(struct task_struct *, struct mm_struct *);
|
|
/* Allocate a new mm structure and copy contents from tsk->mm */
|
|
extern struct mm_struct *dup_mm(struct task_struct *tsk);
|
|
|
|
extern int copy_thread(unsigned long, unsigned long, unsigned long,
|
|
struct task_struct *, struct pt_regs *);
|
|
extern void flush_thread(void);
|
|
extern void exit_thread(void);
|
|
|
|
extern void exit_files(struct task_struct *);
|
|
extern void __cleanup_sighand(struct sighand_struct *);
|
|
|
|
extern void exit_itimers(struct signal_struct *);
|
|
extern void flush_itimer_signals(void);
|
|
|
|
extern void do_group_exit(int);
|
|
|
|
extern void daemonize(const char *, ...);
|
|
extern int allow_signal(int);
|
|
extern int disallow_signal(int);
|
|
|
|
extern int do_execve(const char *,
|
|
const char __user * const __user *,
|
|
const char __user * const __user *, struct pt_regs *);
|
|
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
|
|
struct task_struct *fork_idle(int);
|
|
|
|
extern void set_task_comm(struct task_struct *tsk, char *from);
|
|
extern char *get_task_comm(char *to, struct task_struct *tsk);
|
|
|
|
#ifdef CONFIG_SMP
|
|
void scheduler_ipi(void);
|
|
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
|
|
#else
|
|
static inline void scheduler_ipi(void) { }
|
|
static inline unsigned long wait_task_inactive(struct task_struct *p,
|
|
long match_state)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
#define next_task(p) \
|
|
list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
|
|
|
|
#define for_each_process(p) \
|
|
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
|
|
|
|
extern bool current_is_single_threaded(void);
|
|
|
|
/*
|
|
* Careful: do_each_thread/while_each_thread is a double loop so
|
|
* 'break' will not work as expected - use goto instead.
|
|
*/
|
|
#define do_each_thread(g, t) \
|
|
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
|
|
|
|
#define while_each_thread(g, t) \
|
|
while ((t = next_thread(t)) != g)
|
|
|
|
static inline int get_nr_threads(struct task_struct *tsk)
|
|
{
|
|
return tsk->signal->nr_threads;
|
|
}
|
|
|
|
static inline bool thread_group_leader(struct task_struct *p)
|
|
{
|
|
return p->exit_signal >= 0;
|
|
}
|
|
|
|
/* Do to the insanities of de_thread it is possible for a process
|
|
* to have the pid of the thread group leader without actually being
|
|
* the thread group leader. For iteration through the pids in proc
|
|
* all we care about is that we have a task with the appropriate
|
|
* pid, we don't actually care if we have the right task.
|
|
*/
|
|
static inline int has_group_leader_pid(struct task_struct *p)
|
|
{
|
|
return p->pid == p->tgid;
|
|
}
|
|
|
|
static inline
|
|
int same_thread_group(struct task_struct *p1, struct task_struct *p2)
|
|
{
|
|
return p1->tgid == p2->tgid;
|
|
}
|
|
|
|
static inline struct task_struct *next_thread(const struct task_struct *p)
|
|
{
|
|
return list_entry_rcu(p->thread_group.next,
|
|
struct task_struct, thread_group);
|
|
}
|
|
|
|
static inline int thread_group_empty(struct task_struct *p)
|
|
{
|
|
return list_empty(&p->thread_group);
|
|
}
|
|
|
|
#define delay_group_leader(p) \
|
|
(thread_group_leader(p) && !thread_group_empty(p))
|
|
|
|
/*
|
|
* Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
|
|
* subscriptions and synchronises with wait4(). Also used in procfs. Also
|
|
* pins the final release of task.io_context. Also protects ->cpuset and
|
|
* ->cgroup.subsys[]. And ->vfork_done.
|
|
*
|
|
* Nests both inside and outside of read_lock(&tasklist_lock).
|
|
* It must not be nested with write_lock_irq(&tasklist_lock),
|
|
* neither inside nor outside.
|
|
*/
|
|
static inline void task_lock(struct task_struct *p)
|
|
{
|
|
spin_lock(&p->alloc_lock);
|
|
}
|
|
|
|
static inline void task_unlock(struct task_struct *p)
|
|
{
|
|
spin_unlock(&p->alloc_lock);
|
|
}
|
|
|
|
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
|
|
unsigned long *flags);
|
|
|
|
static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
|
|
unsigned long *flags)
|
|
{
|
|
struct sighand_struct *ret;
|
|
|
|
ret = __lock_task_sighand(tsk, flags);
|
|
(void)__cond_lock(&tsk->sighand->siglock, ret);
|
|
return ret;
|
|
}
|
|
|
|
static inline void unlock_task_sighand(struct task_struct *tsk,
|
|
unsigned long *flags)
|
|
{
|
|
spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
|
|
}
|
|
|
|
#ifdef CONFIG_CGROUPS
|
|
static inline void threadgroup_change_begin(struct task_struct *tsk)
|
|
{
|
|
down_read(&tsk->signal->group_rwsem);
|
|
}
|
|
static inline void threadgroup_change_end(struct task_struct *tsk)
|
|
{
|
|
up_read(&tsk->signal->group_rwsem);
|
|
}
|
|
|
|
/**
|
|
* threadgroup_lock - lock threadgroup
|
|
* @tsk: member task of the threadgroup to lock
|
|
*
|
|
* Lock the threadgroup @tsk belongs to. No new task is allowed to enter
|
|
* and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
|
|
* perform exec. This is useful for cases where the threadgroup needs to
|
|
* stay stable across blockable operations.
|
|
*
|
|
* fork and exit paths explicitly call threadgroup_change_{begin|end}() for
|
|
* synchronization. While held, no new task will be added to threadgroup
|
|
* and no existing live task will have its PF_EXITING set.
|
|
*
|
|
* During exec, a task goes and puts its thread group through unusual
|
|
* changes. After de-threading, exclusive access is assumed to resources
|
|
* which are usually shared by tasks in the same group - e.g. sighand may
|
|
* be replaced with a new one. Also, the exec'ing task takes over group
|
|
* leader role including its pid. Exclude these changes while locked by
|
|
* grabbing cred_guard_mutex which is used to synchronize exec path.
|
|
*/
|
|
static inline void threadgroup_lock(struct task_struct *tsk)
|
|
{
|
|
/*
|
|
* exec uses exit for de-threading nesting group_rwsem inside
|
|
* cred_guard_mutex. Grab cred_guard_mutex first.
|
|
*/
|
|
mutex_lock(&tsk->signal->cred_guard_mutex);
|
|
down_write(&tsk->signal->group_rwsem);
|
|
}
|
|
|
|
/**
|
|
* threadgroup_unlock - unlock threadgroup
|
|
* @tsk: member task of the threadgroup to unlock
|
|
*
|
|
* Reverse threadgroup_lock().
|
|
*/
|
|
static inline void threadgroup_unlock(struct task_struct *tsk)
|
|
{
|
|
up_write(&tsk->signal->group_rwsem);
|
|
mutex_unlock(&tsk->signal->cred_guard_mutex);
|
|
}
|
|
#else
|
|
static inline void threadgroup_change_begin(struct task_struct *tsk) {}
|
|
static inline void threadgroup_change_end(struct task_struct *tsk) {}
|
|
static inline void threadgroup_lock(struct task_struct *tsk) {}
|
|
static inline void threadgroup_unlock(struct task_struct *tsk) {}
|
|
#endif
|
|
|
|
#ifndef __HAVE_THREAD_FUNCTIONS
|
|
|
|
#define task_thread_info(task) ((struct thread_info *)(task)->stack)
|
|
#define task_stack_page(task) ((task)->stack)
|
|
|
|
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
|
|
{
|
|
*task_thread_info(p) = *task_thread_info(org);
|
|
task_thread_info(p)->task = p;
|
|
}
|
|
|
|
static inline unsigned long *end_of_stack(struct task_struct *p)
|
|
{
|
|
return (unsigned long *)(task_thread_info(p) + 1);
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline int object_is_on_stack(void *obj)
|
|
{
|
|
void *stack = task_stack_page(current);
|
|
|
|
return (obj >= stack) && (obj < (stack + THREAD_SIZE));
|
|
}
|
|
|
|
extern void thread_info_cache_init(void);
|
|
|
|
#ifdef CONFIG_DEBUG_STACK_USAGE
|
|
static inline unsigned long stack_not_used(struct task_struct *p)
|
|
{
|
|
unsigned long *n = end_of_stack(p);
|
|
|
|
do { /* Skip over canary */
|
|
n++;
|
|
} while (!*n);
|
|
|
|
return (unsigned long)n - (unsigned long)end_of_stack(p);
|
|
}
|
|
#endif
|
|
|
|
/* set thread flags in other task's structures
|
|
* - see asm/thread_info.h for TIF_xxxx flags available
|
|
*/
|
|
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
set_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
clear_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
|
|
{
|
|
return test_ti_thread_flag(task_thread_info(tsk), flag);
|
|
}
|
|
|
|
static inline void set_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline void clear_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
|
|
}
|
|
|
|
static inline int test_tsk_need_resched(struct task_struct *tsk)
|
|
{
|
|
return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
|
|
}
|
|
|
|
static inline int restart_syscall(void)
|
|
{
|
|
set_tsk_thread_flag(current, TIF_SIGPENDING);
|
|
return -ERESTARTNOINTR;
|
|
}
|
|
|
|
static inline int signal_pending(struct task_struct *p)
|
|
{
|
|
return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
|
|
}
|
|
|
|
static inline int __fatal_signal_pending(struct task_struct *p)
|
|
{
|
|
return unlikely(sigismember(&p->pending.signal, SIGKILL));
|
|
}
|
|
|
|
static inline int fatal_signal_pending(struct task_struct *p)
|
|
{
|
|
return signal_pending(p) && __fatal_signal_pending(p);
|
|
}
|
|
|
|
static inline int signal_pending_state(long state, struct task_struct *p)
|
|
{
|
|
if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
|
|
return 0;
|
|
if (!signal_pending(p))
|
|
return 0;
|
|
|
|
return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
|
|
}
|
|
|
|
static inline int need_resched(void)
|
|
{
|
|
return unlikely(test_thread_flag(TIF_NEED_RESCHED));
|
|
}
|
|
|
|
/*
|
|
* cond_resched() and cond_resched_lock(): latency reduction via
|
|
* explicit rescheduling in places that are safe. The return
|
|
* value indicates whether a reschedule was done in fact.
|
|
* cond_resched_lock() will drop the spinlock before scheduling,
|
|
* cond_resched_softirq() will enable bhs before scheduling.
|
|
*/
|
|
extern int _cond_resched(void);
|
|
|
|
#define cond_resched() ({ \
|
|
__might_sleep(__FILE__, __LINE__, 0); \
|
|
_cond_resched(); \
|
|
})
|
|
|
|
extern int __cond_resched_lock(spinlock_t *lock);
|
|
|
|
#ifdef CONFIG_PREEMPT_COUNT
|
|
#define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET
|
|
#else
|
|
#define PREEMPT_LOCK_OFFSET 0
|
|
#endif
|
|
|
|
#define cond_resched_lock(lock) ({ \
|
|
__might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
|
|
__cond_resched_lock(lock); \
|
|
})
|
|
|
|
extern int __cond_resched_softirq(void);
|
|
|
|
#define cond_resched_softirq() ({ \
|
|
__might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \
|
|
__cond_resched_softirq(); \
|
|
})
|
|
|
|
/*
|
|
* Does a critical section need to be broken due to another
|
|
* task waiting?: (technically does not depend on CONFIG_PREEMPT,
|
|
* but a general need for low latency)
|
|
*/
|
|
static inline int spin_needbreak(spinlock_t *lock)
|
|
{
|
|
#ifdef CONFIG_PREEMPT
|
|
return spin_is_contended(lock);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Thread group CPU time accounting.
|
|
*/
|
|
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
|
|
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
|
|
|
|
static inline void thread_group_cputime_init(struct signal_struct *sig)
|
|
{
|
|
raw_spin_lock_init(&sig->cputimer.lock);
|
|
}
|
|
|
|
/*
|
|
* Reevaluate whether the task has signals pending delivery.
|
|
* Wake the task if so.
|
|
* This is required every time the blocked sigset_t changes.
|
|
* callers must hold sighand->siglock.
|
|
*/
|
|
extern void recalc_sigpending_and_wake(struct task_struct *t);
|
|
extern void recalc_sigpending(void);
|
|
|
|
extern void signal_wake_up(struct task_struct *t, int resume_stopped);
|
|
|
|
/*
|
|
* Wrappers for p->thread_info->cpu access. No-op on UP.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return task_thread_info(p)->cpu;
|
|
}
|
|
|
|
extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
|
|
|
|
#else
|
|
|
|
static inline unsigned int task_cpu(const struct task_struct *p)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
|
|
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
|
|
|
|
extern void normalize_rt_tasks(void);
|
|
|
|
#ifdef CONFIG_CGROUP_SCHED
|
|
|
|
extern struct task_group root_task_group;
|
|
|
|
extern struct task_group *sched_create_group(struct task_group *parent);
|
|
extern void sched_destroy_group(struct task_group *tg);
|
|
extern void sched_move_task(struct task_struct *tsk);
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
|
|
extern unsigned long sched_group_shares(struct task_group *tg);
|
|
#endif
|
|
#ifdef CONFIG_RT_GROUP_SCHED
|
|
extern int sched_group_set_rt_runtime(struct task_group *tg,
|
|
long rt_runtime_us);
|
|
extern long sched_group_rt_runtime(struct task_group *tg);
|
|
extern int sched_group_set_rt_period(struct task_group *tg,
|
|
long rt_period_us);
|
|
extern long sched_group_rt_period(struct task_group *tg);
|
|
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
|
|
#endif
|
|
#endif /* CONFIG_CGROUP_SCHED */
|
|
|
|
extern int task_can_switch_user(struct user_struct *up,
|
|
struct task_struct *tsk);
|
|
|
|
#ifdef CONFIG_TASK_XACCT
|
|
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
|
|
{
|
|
tsk->ioac.rchar += amt;
|
|
}
|
|
|
|
static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
|
|
{
|
|
tsk->ioac.wchar += amt;
|
|
}
|
|
|
|
static inline void inc_syscr(struct task_struct *tsk)
|
|
{
|
|
tsk->ioac.syscr++;
|
|
}
|
|
|
|
static inline void inc_syscw(struct task_struct *tsk)
|
|
{
|
|
tsk->ioac.syscw++;
|
|
}
|
|
#else
|
|
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
|
|
{
|
|
}
|
|
|
|
static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
|
|
{
|
|
}
|
|
|
|
static inline void inc_syscr(struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
static inline void inc_syscw(struct task_struct *tsk)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifndef TASK_SIZE_OF
|
|
#define TASK_SIZE_OF(tsk) TASK_SIZE
|
|
#endif
|
|
|
|
#ifdef CONFIG_MM_OWNER
|
|
extern void mm_update_next_owner(struct mm_struct *mm);
|
|
extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
|
|
#else
|
|
static inline void mm_update_next_owner(struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MM_OWNER */
|
|
|
|
static inline unsigned long task_rlimit(const struct task_struct *tsk,
|
|
unsigned int limit)
|
|
{
|
|
return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
|
|
}
|
|
|
|
static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
|
|
unsigned int limit)
|
|
{
|
|
return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
|
|
}
|
|
|
|
static inline unsigned long rlimit(unsigned int limit)
|
|
{
|
|
return task_rlimit(current, limit);
|
|
}
|
|
|
|
static inline unsigned long rlimit_max(unsigned int limit)
|
|
{
|
|
return task_rlimit_max(current, limit);
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|