Tejun Heo 11a3122f6c block: strip out locking optimization in put_io_context() ... put_io_context() performed a complex trylock dancing to avoid deferring ioc release to workqueue. It was also broken on UP because trylock was always assumed to succeed which resulted in unbalanced preemption count. While there are ways to fix the UP breakage, even the most pathological microbench (forced ioc allocation and tight fork/exit loop) fails to show any appreciable performance benefit of the optimization. Strip it out. If there turns out to be workloads which are affected by this change, simpler optimization from the discussion thread can be applied later. Signed-off-by: Tejun Heo <tj@kernel.org> LKML-Reference: <1328514611.21268.66.camel@sli10-conroe> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2012-02-07 07:51:30 +01:00
..
debug	module: struct module_ref should contains long fields	2012-01-13 09:32:14 +10:30
events	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-01-09 12:59:24 -08:00
gcov
irq	module_param: make bool parameters really bool (core code)	2012-01-13 09:32:18 +10:30
power	PM / Hibernate: Drop the check of swap space size for compressed image	2012-01-14 00:41:37 +01:00
sched	Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security	2012-01-14 18:36:33 -08:00
time	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-01-08 13:21:22 -08:00
trace	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-15 11:26:35 -08:00
.gitignore
acct.c	Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-01-08 12:19:57 -08:00
async.c	kernel/async: remove redundant declaration.	2012-01-13 09:32:18 +10:30
audit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit	2012-01-17 16:41:31 -08:00
audit.h	audit: remove AUDIT_SETUP_CONTEXT as it isn't used	2012-01-17 16:16:57 -05:00
audit_tree.c
audit_watch.c
auditfilter.c	audit: allow interfield comparison in audit rules	2012-01-17 16:17:01 -05:00
auditsc.c	audit: no leading space in audit_log_d_path prefix	2012-01-17 16:17:04 -05:00
backtracetest.c
bounds.c
capability.c	Revert "capabitlies: ns_capable can use the cap helpers rather than lsm call"	2012-01-17 10:19:41 -08:00
cgroup.c	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-01-09 12:59:24 -08:00
cgroup_freezer.c	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-01-09 12:59:24 -08:00
compat.c
configs.c
cpu.c	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
cpu_pm.c
cpuset.c	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-01-09 12:59:24 -08:00
crash_dump.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit	2012-01-17 16:41:31 -08:00
extable.c
fork.c	block: strip out locking optimization in put_io_context()	2012-02-07 07:51:30 +01:00
freezer.c	freezer: kill unused set_freezable_with_signal()	2011-11-23 09:28:17 -08:00
futex.c	futex: Fix uninterruptible loop due to gate_area	2011-12-31 11:48:28 -08:00
futex_compat.c
groups.c
hrtimer.c	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2011-11-28 08:43:52 -08:00
hung_task.c	hung_task: fix false positive during vfork	2012-01-03 16:14:32 -08:00
irq_work.c
itimer.c	[S390] cputime: add sparse checking and cleanup	2011-12-15 14:56:19 +01:00
jump_label.c	Merge remote-tracking branch 'tip/perf/core' into kvm-updates/3.3	2011-12-27 11:22:24 +02:00
kallsyms.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kdump: crashk_res init check for /sys/kernel/kexec_crash_size	2012-01-12 20:13:11 -08:00
kfifo.c
kmod.c	Merge branch 'pm-sleep' into pm-for-linus	2011-12-25 23:42:20 +01:00
kprobes.c	kprobes: silence DEBUG_STRICT_USER_COPY_CHECKS=y warning	2012-01-12 20:13:02 -08:00
ksysfs.c
kthread.c	freezer: kill unused set_freezable_with_signal()	2011-11-23 09:28:17 -08:00
latencytop.c
lockdep.c	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-06 08:02:58 -08:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile	PM: Make sysrq-o be available for CONFIG_PM unset	2012-01-14 00:33:03 +01:00
module.c	error: implicit declaration of function 'module_flags_taint'	2012-01-15 16:21:07 -08:00
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c
padata.c
panic.c	panic: don't print redundant backtraces on oops	2012-01-12 20:13:11 -08:00
params.c	module_param: avoid bool abuse, add bint for special cases.	2012-01-13 09:32:17 +10:30
pid.c	sysctl: add the kernel.ns_last_pid control	2012-01-12 20:13:11 -08:00
pid_namespace.c	sysctl: add the kernel.ns_last_pid control	2012-01-12 20:13:11 -08:00
posix-cpu-timers.c	[S390] cputime: add sparse checking and cleanup	2011-12-15 14:56:19 +01:00
posix-timers.c
printk.c	module_param: make bool parameters really bool (core code)	2012-01-13 09:32:18 +10:30
profile.c
ptrace.c	Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security	2012-01-14 18:36:33 -08:00
range.c
rcu.h	rcu: Deconfuse dynticks entry-exit tracing	2011-12-11 10:31:42 -08:00
rcupdate.c	rcu: Detect illegal rcu dereference in extended quiescent state	2011-12-11 10:31:30 -08:00
rcutiny.c	rcu: Augment rcu_batch_end tracing for idle and callback state	2011-12-11 10:32:22 -08:00
rcutiny_plugin.h	rcu: Apply ACCESS_ONCE() to rcu_boost() return value	2011-12-11 10:33:19 -08:00
rcutorture.c	rcu: Add rcutorture tests for srcu_read_lock_raw()	2011-12-11 10:32:21 -08:00
rcutree.c	rcu: Augment rcu_batch_end tracing for idle and callback state	2011-12-11 10:32:22 -08:00
rcutree.h	rcu: Keep invoking callbacks if CPU otherwise idle	2011-12-11 10:32:09 -08:00
rcutree_plugin.h	rcu: Apply ACCESS_ONCE() to rcu_boost() return value	2011-12-11 10:33:19 -08:00
rcutree_trace.c	rcu: Track idleness independent of idle tasks	2011-12-11 10:31:24 -08:00
relay.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
res_counter.c	resource cgroups: remove bogus cast	2011-12-13 07:43:08 -08:00
resource.c
rtmutex-debug.c	lockdep, rtmutex, bug: Show taint flags on error	2011-12-06 08:16:49 +01:00
rtmutex-debug.h
rtmutex-tester.c	rtmutex-tester: convert sysdev_class to a regular subsystem	2011-12-14 14:54:22 -08:00
rtmutex.c	Revert "rcu: Permit rt_mutex_unlock() with irqs disabled"	2011-12-11 10:33:18 -08:00
rtmutex.h
rtmutex_common.h
rwsem.c
seccomp.c	seccomp: audit abnormal end to a process due to seccomp	2012-01-17 16:16:55 -05:00
semaphore.c
signal.c	user namespace: make signal.c respect user namespaces	2012-01-10 16:30:54 -08:00
smp.c
softirq.c	rcu: Fix early call to rcu_idle_enter()	2011-12-11 10:31:38 -08:00
spinlock.c
srcu.c
stacktrace.c
stop_machine.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
sys.c	c/r: prctl: add PR_SET_MM codes to set up mm_struct entries	2012-01-12 20:13:13 -08:00
sys_ni.c
sysctl.c	x86: Panic on detection of stack overflow	2011-12-05 11:37:47 +01:00
sysctl_binary.c	binary_sysctl(): fix memory leak	2011-12-20 10:25:04 -08:00
sysctl_check.c
taskstats.c
test_kprobes.c
time.c
timeconst.pl
timer.c	Merge branch 'core-debugobjects-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-01-06 07:53:34 -08:00
tracepoint.c
tsacct.c	[S390] cputime: add sparse checking and cleanup	2011-12-15 14:56:19 +01:00
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
wait.c	lockdep/waitqueues: Add better annotation	2011-12-21 10:07:39 +01:00
watchdog.c	watchdog: move watchdog_*_all_cpus under CONFIG_SYSCTL	2011-10-31 17:30:53 -07:00
workqueue.c	workqueue: make alloc_workqueue() take printf fmt and args for name	2012-01-10 16:30:54 -08:00
workqueue_sched.h