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Dipankar Sarma ab2af1f500 [PATCH] files: files struct with RCU 
Patch to eliminate struct files_struct.file_lock spinlock on the reader side
and use rcu refcounting rcuref_xxx api for the f_count refcounter.  The
updates to the fdtable are done by allocating a new fdtable structure and
setting files->fdt to point to the new structure.  The fdtable structure is
protected by RCU thereby allowing lock-free lookup.  For fd arrays/sets that
are vmalloced, we use keventd to free them since RCU callbacks can't sleep.  A
global list of fdtable to be freed is not scalable, so we use a per-cpu list.
If keventd is already handling the current cpu's work, we use a timer to defer
queueing of that work.

Since the last publication, this patch has been re-written to avoid using
explicit memory barriers and use rcu_assign_pointer(), rcu_dereference()
premitives instead.  This required that the fd information is kept in a
separate structure (fdtable) and updated atomically.

Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-09-09 13:57:55 -07:00
..
irq [PATCH] CHECK_IRQ_PER_CPU() to avoid dead code in __do_IRQ() 2005-09-07 16:57:29 -07:00
power Merge linux-2.6 with linux-acpi-2.6 2005-09-08 01:45:47 -04:00
acct.c [PATCH] largefile support for accounting 2005-09-07 16:57:31 -07:00
audit.c [NETLINK]: Add "groups" argument to netlink_kernel_create 2005-08-29 16:01:11 -07:00
auditsc.c AUDIT: Record working directory when syscall arguments are pathnames 2005-05-27 12:17:28 +01:00
capability.c [PATCH] kernel/capability.c: add kerneldoc 2005-07-27 16:26:06 -07:00
compat.c [PATCH] Fix get_compat_sigevent() 2005-04-16 15:24:01 -07:00
configs.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu.c [PATCH] i386 CPU hotplug 2005-06-25 16:24:29 -07:00
cpuset.c [PATCH] fix for cpusets minor problem 2005-09-09 13:57:32 -07:00
crash_dump.c [PATCH] kernel/crash_dump.c: add kerneldoc 2005-07-27 16:26:06 -07:00
dma.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exec_domain.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exit.c [PATCH] files: files struct with RCU 2005-09-09 13:57:55 -07:00
extable.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fork.c [PATCH] files: files struct with RCU 2005-09-09 13:57:55 -07:00
futex.c [PATCH] futex: remove duplicate code 2005-09-07 16:57:33 -07:00
intermodule.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00
itimer.c [PATCH] itimer fixes 2005-07-27 16:25:51 -07:00
kallsyms.c [PATCH] ppc32: platform-specific functions missing from kallsyms. 2005-05-05 16:36:31 -07:00
Kconfig.hz [PATCH] i386: Selectable Frequency of the Timer Interrupt 2005-06-23 09:45:10 -07:00
Kconfig.preempt [PATCH] sched: voluntary kernel preemption 2005-06-25 16:24:45 -07:00
kexec.c [PATCH] kexec: fix sparse warnings 2005-06-28 14:53:40 -07:00
kfifo.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kmod.c [PATCH] Keys: Pass session keyring to call_usermodehelper() 2005-06-24 00:05:18 -07:00
kprobes.c [PATCH] kprobes: fix bug when probed on task and isr functions 2005-09-07 16:58:01 -07:00
ksysfs.c [PATCH] Kdump: Export crash notes section address through sysfs 2005-06-25 16:24:51 -07:00
kthread.c [PATCH] use smp_mb/wmb/rmb where possible 2005-05-01 08:58:47 -07:00
Makefile [PATCH] detect soft lockups 2005-09-07 16:57:17 -07:00
module.c [PATCH] flush icache early when loading module 2005-09-07 16:57:26 -07:00
panic.c [PATCH] Call emergency_reboot from panic 2005-07-26 14:35:43 -07:00
params.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00
pid.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix-cpu-timers.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix-timers.c [PATCH] fix send_sigqueue() vs thread exit race 2005-09-07 16:57:33 -07:00
printk.c [PATCH] Provide better printk() support for SMP machines 2005-09-07 16:57:18 -07:00
profile.c [PATCH] mostly_read data section 2005-07-07 18:23:46 -07:00
ptrace.c [PATCH] remove duplicated code from proc and ptrace 2005-09-07 16:57:43 -07:00
rcupdate.c [PATCH] files: rcuref APIs 2005-09-09 13:57:54 -07:00
resource.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00
sched.c [PATCH] Prefetch kernel stacks to speed up context switch 2005-09-09 13:57:31 -07:00
seccomp.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.c [PATCH] fix send_sigqueue() vs thread exit race 2005-09-07 16:57:33 -07:00
softirq.c [PATCH] revert bogus softirq changes 2005-07-30 10:49:59 -07:00
softlockup.c [PATCH] detect soft lockups 2005-09-07 16:57:17 -07:00
spinlock.c [PATCH] spin_unlock_bh() and preempt_check_resched() 2005-05-21 10:46:48 -07:00
stop_machine.c [PATCH] smp_processor_id() cleanup 2005-06-21 18:46:13 -07:00
sys_ni.c [PATCH] remove sys_set_zone_reclaim() 2005-08-01 10:03:56 -07:00
sys.c [PATCH] remove a redundant variable in sys_prctl() 2005-09-07 16:57:32 -07:00
sysctl.c [NET]: Fix sparse warnings 2005-08-29 16:01:32 -07:00
time.c [PATCH] clean up inline static vs static inline 2005-07-27 16:26:20 -07:00
timer.c [PATCH] optimize writer path in time_interpolator_get_counter() 2005-09-07 16:57:24 -07:00
uid16.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
user.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
wait.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
workqueue.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00