Ingo Molnar 7355690ead [PATCH] sched: fix SMT scheduler bug ... The SMT scheduler incorrectly skips kernel threads even if they are runnable (but they are preempted by a higher-prio user-space task which got SMT-delayed by an even higher-priority task running on a sibling CPU). Fix this for now by only doing the SMT-nice optimization if the to-be-delayed task is the only runnable task. (This should cover most of the real-life cases anyway.) This bug has been in the SMT scheduler since 2.6.17 or so, but has only been noticed now by the active check in the dynticks code. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2007-03-01 14:53:38 -08:00
..
irq	[PATCH] genirq: Mask irqs when migrating them.	2007-02-26 10:34:08 -08:00
power	power management: no valid states w/o pm_ops	2007-02-23 14:52:09 -08:00
time	[TICK] tick-common: Fix one-shot handling in tick_handle_periodic().	2007-02-26 11:14:15 -08:00
.gitignore
acct.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
audit.c	[PATCH] audit config lockdown	2007-02-17 21:30:12 -05:00
audit.h
auditfilter.c	[PATCH] minor update to rule add/delete messages (ver 2)	2007-02-17 21:30:09 -05:00
auditsc.c	[PATCH] AUDIT_FD_PAIR	2007-02-17 21:30:15 -05:00
capability.c	[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task	2007-02-12 09:48:32 -08:00
compat.c	[PATCH] Common compat_sys_sysinfo	2007-02-11 10:51:32 -08:00
configs.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
cpu.c	[PATCH] swsusp: Change code ordering in disk.c	2007-02-11 10:51:19 -08:00
cpuset.c	[PATCH] mark struct inode_operations const 2	2007-02-12 09:48:46 -08:00
delayacct.c
dma.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
exec_domain.c
exit.c	[PATCH] pid: replace is_orphaned_pgrp with is_current_pgrp_orphaned	2007-02-12 09:48:32 -08:00
extable.c
fork.c	[PATCH] hrtimers: namespace and enum cleanup	2007-02-16 08:13:58 -08:00
futex_compat.c
futex.c	[PATCH] hrtimers: namespace and enum cleanup	2007-02-16 08:13:58 -08:00
hrtimer.c	[PATCH] Add debugging feature /proc/timer_stat	2007-02-16 08:13:59 -08:00
itimer.c	[PATCH] hrtimers: prevent possible itimer DoS	2007-02-16 08:13:59 -08:00
kallsyms.c	[PATCH] move kallsyms data to .rodata	2006-12-08 08:28:37 -08:00
Kconfig.hz
Kconfig.preempt
kexec.c	Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6	2006-12-07 15:39:22 -08:00
kfifo.c	[PATCH] Numerous fixes to kernel-doc info in source files.	2007-02-11 10:51:32 -08:00
kmod.c	Revert "Driver core: let request_module() send a /sys/modules/kmod/-uevent"	2007-02-23 14:54:57 -08:00
kprobes.c	[PATCH] kprobes: list all active probes in the system	2007-02-20 17:10:14 -08:00
ksysfs.c
kthread.c	[PATCH] Numerous fixes to kernel-doc info in source files.	2007-02-11 10:51:32 -08:00
latency.c
lockdep_internals.h	[PATCH] lockdep: more chains	2006-12-07 08:39:43 -08:00
lockdep_proc.c	[PATCH] remove many unneeded #includes of sched.h	2007-02-14 08:09:54 -08:00
lockdep.c	[PATCH] fix section mismatch warning in lockdep	2007-03-01 14:53:37 -08:00
Makefile	[PATCH] sysctl: move utsname sysctls to their own file	2007-02-14 08:09:58 -08:00
module.c	Revert "Driver core: let request_module() send a /sys/modules/kmod/-uevent"	2007-02-23 14:54:57 -08:00
mutex-debug.c	[PATCH] remove many unneeded #includes of sched.h	2007-02-14 08:09:54 -08:00
mutex-debug.h
mutex.c	[PATCH] lockdep: avoid lockdep warning in md	2006-12-08 08:28:39 -08:00
mutex.h
nsproxy.c	Revert "[PATCH] namespaces: fix exit race by splitting exit"	2007-01-30 13:35:18 -08:00
panic.c	[PATCH] Add TAINT_USER and ability to set taint flags from userspace	2007-02-11 10:51:29 -08:00
params.c	Revert "Driver core: let request_module() send a /sys/modules/kmod/-uevent"	2007-02-23 14:54:57 -08:00
pid.c	[PATCH] namespaces: fix task exit disaster	2007-01-30 13:40:36 -08:00
posix-cpu-timers.c	[PATCH] posix timers: RCU optimization for clock_gettime()	2007-02-16 08:14:00 -08:00
posix-timers.c	[PATCH] hrtimers: add high resolution timer support	2007-02-16 08:13:59 -08:00
printk.c	kernel/printk.c: comment fix	2007-02-17 20:10:16 +01:00
profile.c	[PATCH] proc: remove useless (and buggy) ->nlink settings	2007-02-11 10:51:32 -08:00
ptrace.c
rcupdate.c	[PATCH] rcu: add a prefetch() in rcu_do_batch()	2006-12-07 08:39:40 -08:00
rcutorture.c	[PATCH] rcu: rcutorture suspend fix	2006-12-30 10:55:55 -08:00
relay.c	[PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers)	2007-03-01 14:53:37 -08:00
resource.c	[PATCH] remove many unneeded #includes of sched.h	2007-02-14 08:09:54 -08:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c	[PATCH] hrtimers: namespace and enum cleanup	2007-02-16 08:13:58 -08:00
rtmutex.h
rwsem.c
sched.c	[PATCH] sched: fix SMT scheduler bug	2007-03-01 14:53:38 -08:00
seccomp.c
signal.c	Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6	2007-02-26 12:48:06 -08:00
softirq.c	[PATCH] tick-management: dyntick / highres functionality	2007-02-16 08:13:59 -08:00
softlockup.c
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys_ni.c
sys.c	[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task	2007-02-12 09:48:32 -08:00
sysctl.c	[PATCH] fix the SYSCTL=n compilation	2007-03-01 14:53:37 -08:00
taskstats.c
time.c	[PATCH] Fix multiple conversion bugs in msecs_to_jiffies	2007-02-16 08:13:56 -08:00
timer.c	[PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers)	2007-03-01 14:53:37 -08:00
tsacct.c	[PATCH] time: x86_64: split x86_64/kernel/time.c up	2007-02-16 08:14:00 -08:00
uid16.c
user.c
utsname_sysctl.c	[PATCH] sysctl: remove insert_at_head from register_sysctl	2007-02-14 08:09:59 -08:00
utsname.c
wait.c
workqueue.c	[PATCH] Add debugging feature /proc/timer_stat	2007-02-16 08:13:59 -08:00