iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
linux/kernel
History
Shailabh Nagar bb129994c3 [PATCH] Remove down_write() from taskstats code invoked on the exit() path 
In send_cpu_listeners(), which is called on the exit path, a down_write()
was protecting operations like skb_clone() and genlmsg_unicast() that do
GFP_KERNEL allocations.  If the oom-killer decides to kill tasks to satisfy
the allocations,the exit of those tasks could block on the same semphore.

The down_write() was only needed to allow removal of invalid listeners from
the listener list.  The patch converts the down_write to a down_read and
defers the removal to a separate critical region.  This ensures that even
if the oom-killer is called, no other task's exit is blocked as it can
still acquire another down_read.

Thanks to Andrew Morton & Herbert Xu for pointing out the oom related
pitfalls, and to Chandra Seetharaman for suggesting this fix instead of
using something more complex like RCU.

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-14 21:53:57 -07:00
..
irq
Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
2006-07-03 15:28:34 -07:00
power
[PATCH] remove kernel/power/pm.c:pm_unregister_all()
2006-07-12 16:09:08 -07:00
time
[PATCH] time: rename clocksource functions
2006-06-26 09:58:21 -07:00
.gitignore
gitignore: ignore more generated files
2006-01-03 11:35:26 +01:00
acct.c
[PATCH] Fix sighand->siglock usage in kernel/acct.c
2006-07-14 21:53:54 -07:00
audit.c
[NETLINK]: Encapsulate eff_cap usage within security framework.
2006-06-29 16:57:55 -07:00
audit.h
[PATCH] add rule filterkey
2006-07-01 05:43:06 -04:00
auditfilter.c
[PATCH] audit syscall classes
2006-07-01 07:44:10 -04:00
auditsc.c
[PATCH] audit: support for object context filters
2006-07-01 05:44:19 -04:00
capability.c
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct
2006-07-03 15:27:11 -07:00
compat.c
[PATCH] N32 sigset and __COMPAT_ENDIAN_SWAP__
2006-06-25 10:01:15 -07:00
configs.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
cpu.c
[PATCH] cpu hotplug: make [un]register_cpu_notifier init time only
2006-06-27 17:32:41 -07:00
cpuset.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
delayacct.c
[PATCH] per-task-delay-accounting: /proc export of aggregated block I/O delays
2006-07-14 21:53:57 -07:00
dma.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
exec_domain.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
exit.c
[PATCH] per-task delay accounting taskstats interface: control exit data through cpumasks
2006-07-14 21:53:57 -07:00
extable.c
[PATCH] symbol_put_addr() locks kernel
2006-05-15 11:20:55 -07:00
fork.c
[PATCH] delay accounting taskstats interface send tgid once
2006-07-14 21:53:57 -07:00
futex_compat.c
[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support
2006-06-27 17:32:47 -07:00
futex.c
[PATCH] pi-futex: Validate futex type instead of oopsing
2006-07-10 13:24:18 -07:00
hrtimer.c
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct
2006-07-03 15:27:11 -07:00
itimer.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
kallsyms.c
[PATCH] null-terminate over-long /proc/kallsyms symbols
2006-07-14 21:53:52 -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
[POWERPC] Add the use of the firmware soft-reset-nmi to kdump.
2006-06-28 15:18:52 +10:00
kfifo.c
[PATCH] gfp flags annotations - part 1
2005-10-08 15:00:57 -07:00
kmod.c
[PATCH] lockdep: annotate on-stack completions
2006-07-03 15:27:09 -07:00
kprobes.c
[PATCH] Notify page fault call chain
2006-06-26 09:58:22 -07:00
ksysfs.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
kthread.c
[PATCH] remove kernel/kthread.c:kthread_stop_sem()
2006-07-14 21:53:52 -07:00
lockdep_internals.h
[PATCH] lockdep: core
2006-07-03 15:27:03 -07:00
lockdep_proc.c
[PATCH] lockdep: procfs
2006-07-03 15:27:04 -07:00
lockdep.c
[PATCH] lockdep: core, reduce per-lock class-cache size
2006-07-10 13:24:14 -07:00
Makefile
[PATCH] per-task-delay-accounting: taskstats interface
2006-07-14 21:53:56 -07:00
module.c
[PATCH] null-terminate over-long /proc/kallsyms symbols
2006-07-14 21:53:52 -07:00
mutex-debug.c
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
mutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
mutex.c
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
mutex.h
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
panic.c
[PATCH] lockdep: disable lock debugging when kernel state becomes untrusted
2006-07-10 13:24:27 -07:00
params.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
pid.c
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct
2006-07-03 15:27:11 -07:00
posix-cpu-timers.c
[PATCH] arm_timer: remove a racy and obsolete PF_EXITING check
2006-06-17 10:52:13 -07:00
posix-timers.c
[PATCH] hrtimers: remove data field
2006-03-26 08:57:03 -08:00
printk.c
[PATCH] kernel/printk.c: EXPORT_SYMBOL_UNUSED
2006-07-10 13:24:17 -07:00
profile.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
ptrace.c
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct
2006-07-03 15:27:11 -07:00
rcupdate.c
[PATCH] lockdep: locking init debugging improvement
2006-07-03 15:27:02 -07:00
rcutorture.c
[PATCH] rcutorture: add call_rcu_bh() operations
2006-06-27 17:32:40 -07:00
relay.c
[PATCH] relay: consolidate sendfile() and read() code
2006-03-23 19:58:45 +01:00
resource.c
[PATCH] The scheduled unexport of insert_resource
2006-07-12 16:09:08 -07:00
rtmutex_common.h
[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support
2006-06-27 17:32:47 -07:00
rtmutex-debug.c
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct
2006-07-03 15:27:11 -07:00
rtmutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rtmutex-tester.c
[PATCH] Add try_to_freeze() to rt-test kthreads
2006-07-14 21:53:53 -07:00
rtmutex.c
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct
2006-07-03 15:27:11 -07:00
rtmutex.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rwsem.c
[PATCH] lockdep: prove rwsem locking correctness
2006-07-03 15:27:04 -07:00
sched.c
[PATCH] per-task-delay-accounting: cpu delay collection via schedstats
2006-07-14 21:53:56 -07:00
seccomp.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
signal.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial
2006-06-30 15:39:30 -07:00
softirq.c
[PATCH] unexport open_softirq
2006-07-14 21:53:53 -07:00
softlockup.c
[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17
2006-06-27 17:32:41 -07:00
spinlock.c
[PATCH] lockdep: prove spinlock rwlock locking correctness
2006-07-03 15:27:04 -07:00
stacktrace.c
[PATCH] lockdep: stacktrace subsystem, core
2006-07-03 15:27:02 -07:00
stop_machine.c
[PATCH] revert "kthread: convert stop_machine into a kthread"
2006-07-03 21:25:20 -07:00
sys_ni.c
[PATCH] sys_move_pages: 32bit support (i386, x86_64)
2006-06-23 07:42:53 -07:00
sys.c
[PATCH] Fix prctl privilege escalation and suid_dumpable (CVE-2006-2451)
2006-07-12 12:50:25 -07:00
sysctl.c
[PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O
2006-07-03 15:26:59 -07:00
taskstats.c
[PATCH] Remove down_write() from taskstats code invoked on the exit() path
2006-07-14 21:53:57 -07:00
time.c
[PATCH] Time: Introduce arch generic time accessors
2006-06-26 09:58:20 -07:00
timer.c
[PATCH] improve timekeeping resume robustness
2006-07-14 21:53:54 -07:00
uid16.c
[PATCH] Add more prevent_tail_call()
2006-04-19 16:27:18 -07:00
unwind.c
[PATCH] x86_64: allow unwinder to build without module support
2006-06-26 10:48:18 -07:00
user.c
[PATCH] selinux: add hooks for key subsystem
2006-06-22 15:05:55 -07:00
wait.c
[PATCH] uninline init_waitqueue_head()
2006-07-10 13:24:25 -07:00
workqueue.c
Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
2006-07-04 14:00:26 -07:00