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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>		19 years ago
..
irq	Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc	19 years ago
power	[PATCH] remove kernel/power/pm.c:pm_unregister_all()	19 years ago
time	[PATCH] time: rename clocksource functions	19 years ago
.gitignore	gitignore: ignore more generated files	19 years ago
Kconfig.hz	[PATCH] i386: Selectable Frequency of the Timer Interrupt	20 years ago
Kconfig.preempt	[PATCH] sched: voluntary kernel preemption	20 years ago
Makefile	[PATCH] per-task-delay-accounting: taskstats interface	19 years ago
acct.c	[PATCH] Fix sighand->siglock usage in kernel/acct.c	19 years ago
audit.c	[NETLINK]: Encapsulate eff_cap usage within security framework.	19 years ago
audit.h	[PATCH] add rule filterkey	19 years ago
auditfilter.c	[PATCH] audit syscall classes	19 years ago
auditsc.c	[PATCH] audit: support for object context filters	19 years ago
capability.c	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	19 years ago
compat.c	[PATCH] N32 sigset and __COMPAT_ENDIAN_SWAP__	19 years ago
configs.c	Remove obsolete #include <linux/config.h>	19 years ago
cpu.c	[PATCH] cpu hotplug: make [un]register_cpu_notifier init time only	19 years ago
cpuset.c	Remove obsolete #include <linux/config.h>	19 years ago
delayacct.c	[PATCH] per-task-delay-accounting: /proc export of aggregated block I/O delays	19 years ago
dma.c	…
exec_domain.c	Remove obsolete #include <linux/config.h>	19 years ago
exit.c	[PATCH] per-task delay accounting taskstats interface: control exit data through cpumasks	19 years ago
extable.c	[PATCH] symbol_put_addr() locks kernel	19 years ago
fork.c	[PATCH] delay accounting taskstats interface send tgid once	19 years ago
futex.c	[PATCH] pi-futex: Validate futex type instead of oopsing	19 years ago
futex_compat.c	[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support	19 years ago
hrtimer.c	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	19 years ago
itimer.c	[PATCH] hrtimers: remove data field	19 years ago
kallsyms.c	[PATCH] null-terminate over-long /proc/kallsyms symbols	19 years ago
kexec.c	[POWERPC] Add the use of the firmware soft-reset-nmi to kdump.	19 years ago
kfifo.c	[PATCH] gfp flags annotations - part 1	20 years ago
kmod.c	[PATCH] lockdep: annotate on-stack completions	19 years ago
kprobes.c	[PATCH] Notify page fault call chain	19 years ago
ksysfs.c	Remove obsolete #include <linux/config.h>	19 years ago
kthread.c	[PATCH] remove kernel/kthread.c:kthread_stop_sem()	19 years ago
lockdep.c	[PATCH] lockdep: core, reduce per-lock class-cache size	19 years ago
lockdep_internals.h	[PATCH] lockdep: core	19 years ago
lockdep_proc.c	[PATCH] lockdep: procfs	19 years ago
module.c	[PATCH] null-terminate over-long /proc/kallsyms symbols	19 years ago
mutex-debug.c	[PATCH] lockdep: prove mutex locking correctness	19 years ago
mutex-debug.h	[PATCH] lockdep: better lock debugging	19 years ago
mutex.c	[PATCH] lockdep: prove mutex locking correctness	19 years ago
mutex.h	[PATCH] lockdep: prove mutex locking correctness	19 years ago
panic.c	[PATCH] lockdep: disable lock debugging when kernel state becomes untrusted	19 years ago
params.c	Remove obsolete #include <linux/config.h>	19 years ago
pid.c	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	19 years ago
posix-cpu-timers.c	[PATCH] arm_timer: remove a racy and obsolete PF_EXITING check	19 years ago
posix-timers.c	[PATCH] hrtimers: remove data field	19 years ago
printk.c	[PATCH] kernel/printk.c: EXPORT_SYMBOL_UNUSED	19 years ago
profile.c	Remove obsolete #include <linux/config.h>	19 years ago
ptrace.c	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	19 years ago
rcupdate.c	[PATCH] lockdep: locking init debugging improvement	19 years ago
rcutorture.c	[PATCH] rcutorture: add call_rcu_bh() operations	19 years ago
relay.c	[PATCH] relay: consolidate sendfile() and read() code	19 years ago
resource.c	[PATCH] The scheduled unexport of insert_resource	19 years ago
rtmutex-debug.c	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	19 years ago
rtmutex-debug.h	[PATCH] lockdep: better lock debugging	19 years ago
rtmutex-tester.c	[PATCH] Add try_to_freeze() to rt-test kthreads	19 years ago
rtmutex.c	[PATCH] sched: cleanup, remove task_t, convert to struct task_struct	19 years ago
rtmutex.h	[PATCH] lockdep: better lock debugging	19 years ago
rtmutex_common.h	[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support	19 years ago
rwsem.c	[PATCH] lockdep: prove rwsem locking correctness	19 years ago
sched.c	[PATCH] per-task-delay-accounting: cpu delay collection via schedstats	19 years ago
seccomp.c	…
signal.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial	19 years ago
softirq.c	[PATCH] unexport open_softirq	19 years ago
softlockup.c	[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17	19 years ago
spinlock.c	[PATCH] lockdep: prove spinlock rwlock locking correctness	19 years ago
stacktrace.c	[PATCH] lockdep: stacktrace subsystem, core	19 years ago
stop_machine.c	[PATCH] revert "kthread: convert stop_machine into a kthread"	19 years ago
sys.c	[PATCH] Fix prctl privilege escalation and suid_dumpable (CVE-2006-2451)	19 years ago
sys_ni.c	[PATCH] sys_move_pages: 32bit support (i386, x86_64)	19 years ago
sysctl.c	[PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O	19 years ago
taskstats.c	[PATCH] Remove down_write() from taskstats code invoked on the exit() path	19 years ago
time.c	[PATCH] Time: Introduce arch generic time accessors	19 years ago
timer.c	[PATCH] improve timekeeping resume robustness	19 years ago
uid16.c	[PATCH] Add more prevent_tail_call()	19 years ago
unwind.c	[PATCH] x86_64: allow unwinder to build without module support	19 years ago
user.c	[PATCH] selinux: add hooks for key subsystem	19 years ago
wait.c	[PATCH] uninline init_waitqueue_head()	19 years ago
workqueue.c	Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq	19 years ago