Steven Rostedt 9418fb2080 rcu: Do not trace rcu_is_watching() functions ... As perf uses the rcu_read_lock() primitives for recording into its ring buffer, perf tracing can not be called when RCU in inactive. With the perf function tracing, there are functions that can be traced when RCU is not active, and perf must not have its function callback called when this is the case. Luckily, Paul McKenney has created a way to detect when RCU is active or not with the rcu_is_watching() function. Unfortunately, this function can also be traced, and if that happens it can cause a bit of overhead for the perf function calls that do the check. Recursion protection prevents anything bad from happening, but there is a bit of added overhead for every function being traced that must detect that the rcu_is_watching() is also being traced. As rcu_is_watching() is a helper routine and not part of the critical logic in RCU, it does not need to be traced in order to debug RCU itself. Add the "notrace" annotation to all the rcu_is_watching() calls such that we never trace it. Link: http://lkml.kernel.org/r/20131104202736.72dd8e45@gandalf.local.home Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2013-11-05 16:04:08 -05:00
..
cpu
debug
events	perf: Fix capabilities bitfield compatibility in 'struct perf_event_mmap_page'	2013-09-20 09:45:11 +02:00
gcov	kernel: replace strict_strto*() with kstrto*()	2013-09-12 15:38:03 -07:00
irq	Remove GENERIC_HARDIRQ config option	2013-09-13 15:09:52 +02:00
power	PM / hibernate: Fix user space driven resume regression	2013-09-30 19:40:56 +02:00
printk	TTY/Serial driver patches for 3.12-rc1	2013-09-03 11:38:36 -07:00
sched	sched/balancing: Fix cfs_rq->task_h_load calculation	2013-09-20 11:59:39 +02:00
time	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-09-18 11:24:49 -05:00
trace	trace/trace_stat: use rbtree postorder iteration helper instead of opencoding	2013-11-05 16:01:47 -05:00
.gitignore
acct.c
async.c
audit.c	audit: fix endless wait in audit_log_start()	2013-09-24 17:00:26 -07:00
audit.h	audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record	2013-07-09 10:33:19 -07:00
audit_tree.c
audit_watch.c
auditfilter.c	audit: Fix decimal constant description	2013-07-09 10:33:19 -07:00
auditsc.c	audit: fix mq_open and mq_unlink to add the MQ root as a hidden parent audit_names record	2013-07-09 10:33:19 -07:00
backtracetest.c
bounds.c
capability.c	xfs: update for v3.12-rc1	2013-09-09 11:19:09 -07:00
cgroup.c	Kill indirect include of file.h from eventfd.h, use fdget() in cgroup.c	2013-09-07 19:54:57 -04:00
cgroup_freezer.c	cgroup: make css_for_each_descendant() and friends include the origin css in the iteration	2013-08-08 20:11:27 -04:00
compat.c
configs.c
context_tracking.c	arm: Fix build error with context tracking calls	2013-09-27 17:59:47 +02:00
cpu.c	ACPI / processor: Acquire writer lock to update CPU maps	2013-08-13 12:20:16 +02:00
cpu_pm.c
cpuset.c	Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2013-09-03 18:25:03 -07:00
crash_dump.c
cred.c
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	ptrace: revert "Prepare to fix racy accesses on task breakpoints"	2013-07-09 10:33:26 -07:00
extable.c	extable: skip sorting if the table is empty	2013-09-11 15:58:25 -07:00
fork.c	Merge git://git.kvack.org/~bcrl/aio-next	2013-09-13 10:55:58 -07:00
freezer.c	freezer: set PF_SUSPEND_TASK flag on tasks that call freeze_processes	2013-07-30 14:05:06 +02:00
futex.c	futex: Use freezable blocking call	2013-06-25 23:11:19 +02:00
futex_compat.c
groups.c	userns: Kill nsown_capable it makes the wrong thing easy	2013-08-30 23:44:11 -07:00
hrtimer.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
hung_task.c	hung_task debugging: Print more info when reporting the problem	2013-08-02 11:02:42 +02:00
irq_work.c
itimer.c
jump_label.c	jump_label: Split jumplabel ratelimit	2013-08-09 07:53:54 -07:00
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: remove unnecessary return	2013-09-11 15:59:10 -07:00
kmod.c	kernel/kmod.c: check for NULL in call_usermodehelper_exec()	2013-09-30 14:31:02 -07:00
kprobes.c	kprobes: allow to specify custom allocator for insn caches	2013-09-11 15:58:52 -07:00
ksysfs.c	kernel: replace strict_strto*() with kstrto*()	2013-09-12 15:38:03 -07:00
kthread.c
latencytop.c
lglock.c	lglock: Update lockdep annotations to report recursive local locks	2013-07-12 13:51:19 +02:00
lockdep.c	rcu: Consistent rcu_is_watching() naming	2013-09-25 06:45:06 -07:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile	Remove GENERIC_HARDIRQ config option	2013-09-13 15:09:52 +02:00
modsign_certificate.S
modsign_pubkey.c	kernel/modsign_pubkey.c: fix init const for module signing code	2013-09-11 15:58:21 -07:00
module-internal.h
module.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-09-05 08:50:26 -07:00
module_signing.c
mutex-debug.c
mutex-debug.h
mutex.c	Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-09-04 08:18:19 -07:00
mutex.h
notifier.c
nsproxy.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2013-09-07 14:35:32 -07:00
padata.c	padata - Register hotcpu notifier after initialization	2013-08-29 14:37:59 +10:00
panic.c	panic: call panic handlers before kmsg_dump	2013-09-11 15:59:30 -07:00
params.c	kernel/params: fix handling of signed integer types	2013-09-28 12:35:52 -07:00
pid.c	pidns: fix free_pid() to handle the first fork failure	2013-09-30 14:31:03 -07:00
pid_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2013-09-07 14:35:32 -07:00
posix-cpu-timers.c	posix_timers: fix racy timer delta caching on task exit	2013-07-03 16:54:42 +02:00
posix-timers.c
profile.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
ptrace.c	__ptrace_may_access() should not deny sub-threads	2013-09-11 15:59:01 -07:00
range.c
rcu.h	rcu: Make call_rcu() leak callbacks for debug-object errors	2013-08-18 17:40:03 -07:00
rcupdate.c	rcu: Consistent rcu_is_watching() naming	2013-09-25 06:45:06 -07:00
rcutiny.c	rcu: Do not trace rcu_is_watching() functions	2013-11-05 16:04:08 -05:00
rcutiny_plugin.h	rcu: Add const annotation to char * for RCU tracepoints and functions	2013-07-29 17:07:49 -04:00
rcutorture.c	rcu: Make rcutorture emit online failures if verbose	2013-08-20 11:38:45 -07:00
rcutree.c	rcu: Do not trace rcu_is_watching() functions	2013-11-05 16:04:08 -05:00
rcutree.h	rcu: Throttle rcu_try_advance_all_cbs() execution	2013-09-25 06:44:25 -07:00
rcutree_plugin.h	rcu: Throttle invoke_rcu_core() invocations due to non-lazy callbacks	2013-09-25 06:44:33 -07:00
rcutree_trace.c
reboot.c	kernel/reboot.c: re-enable the function of variable reboot_default	2013-09-24 17:00:26 -07:00
relay.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
res_counter.c	memcg: reduce function dereference	2013-09-12 15:38:02 -07:00
resource.c	kernel/resource.c: remove the unneeded assignment in function __find_resource	2013-07-03 16:08:06 -07:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
seccomp.c
semaphore.c
signal.c	kernel-wide: fix missing validations on __get/__put/__copy_to/__copy_from_user()	2013-09-11 15:58:18 -07:00
smp.c	kernel/smp.c: quit unconditionally enabling irqs in on_each_cpu_mask().	2013-09-11 15:58:25 -07:00
smpboot.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
smpboot.h
softirq.c	irq: Force hardirq exit's softirq processing on its own stack	2013-10-01 12:39:08 +02:00
spinlock.c	kernel/spinlock.c: add default arch_*_relax definitions for GENERIC_LOCKBREAK	2013-09-11 15:58:21 -07:00
srcu.c
stacktrace.c
stop_machine.c
sys.c	userns: Kill nsown_capable it makes the wrong thing easy	2013-08-30 23:44:11 -07:00
sys_ni.c
sysctl.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-09-12 15:01:38 -07:00
sysctl_binary.c	kernel: remove unnecessary head file	2013-06-26 18:01:46 +09:00
task_work.c	task_work: documentation	2013-09-11 15:58:27 -07:00
taskstats.c
test_kprobes.c
time.c
timeconst.bc
timer.c	kernel: delete __cpuinit usage from all core kernel files	2013-07-14 19:36:59 -04:00
tracepoint.c
tsacct.c
uid16.c	userns: Kill nsown_capable it makes the wrong thing easy	2013-08-30 23:44:11 -07:00
up.c	smp.h: move !SMP version of on_each_cpu() out-of-line	2013-09-11 15:58:25 -07:00
user-return-notifier.c
user.c	userns: Better restrictions on when proc and sysfs can be mounted	2013-08-26 19:17:03 -07:00
user_namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2013-09-07 14:35:32 -07:00
utsname.c	userns: Kill nsown_capable it makes the wrong thing easy	2013-08-30 23:44:11 -07:00
utsname_sysctl.c
wait.c	kernel: fix new kernel-doc warning in wait.c	2013-08-19 09:08:54 -07:00
watchdog.c	watchdog: update watchdog_thresh properly	2013-09-24 17:00:25 -07:00
workqueue.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-09-06 09:36:28 -07:00
workqueue_internal.h