redonkable/alistair23-linux
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alistair23-linux/kernel
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Frederic Weisbecker fc3b86d673 perf: Roll back callchain buffer refcount under the callchain mutex 
When we fail to allocate the callchain buffers, we roll back the refcount
we did and return from get_callchain_buffers().

However we take the refcount and allocate under the callchain lock
but the rollback is done outside the lock.

As a result, while we roll back, some concurrent callchain user may
call get_callchain_buffers(), see the non-zero refcount and give up
because the buffers are NULL without itself retrying the allocation.

The consequences aren't that bad but that behaviour looks weird enough and
it's better to give their chances to the following callchain users where
we failed.

Reported-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1375460996-16329-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-08-16 17:55:50 +02:00
..
cpu idle: Enable interrupts in the weak arch_cpu_idle() implementation 2013-06-14 23:01:05 +02:00
debug kgdb/sysrq: fix inconstistent help message of sysrq key 2013-04-30 17:04:10 -07:00
events perf: Roll back callchain buffer refcount under the callchain mutex 2013-08-16 17:55:50 +02:00
gcov
irq Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-07-13 15:37:30 -07:00
power freezer: set PF_SUSPEND_TASK flag on tasks that call freeze_processes 2013-07-30 14:05:06 +02:00
printk printk: Fix return of braille_register_console() 2013-08-06 13:18:12 -07:00
sched Linux 3.11-rc5 2013-08-15 10:00:09 +02:00
time Revert "cpuidle: Quickly notice prediction failure for repeat mode" 2013-07-29 13:32:29 +02:00
trace tracing: Fix reset of time stamps during trace_clock changes 2013-08-02 22:40:09 -04:00
.gitignore kernel/hz.bc: ignore. 2013-04-22 07:09:06 -07:00
acct.c fs: Fix hang with BSD accounting on frozen filesystem 2013-05-04 14:57:58 -04:00
async.c
audit.c audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE 2013-06-12 16:29:45 -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 kernel/audit_tree.c:audit_add_tree_rule(): protect `rule' from kill_rules() 2013-06-12 16:29:46 -07:00
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 Add file_ns_capable() helper function for open-time capability checking 2013-04-14 10:06:31 -07:00
cgroup.c Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2013-08-06 13:59:28 -07:00
cgroup_freezer.c
compat.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-05-01 07:21:43 -07:00
configs.c proc: Supply PDE attribute setting accessor functions 2013-05-01 17:29:18 -04:00
context_tracking.c Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-06-20 08:18:35 -10:00
cpu.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
cpu_pm.c
cpuset.c Merge branch 'for-3.11-cpuset' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2013-07-02 20:04:25 -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: Flip the sorting message 2013-04-15 13:25:16 +02:00
fork.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
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
hrtimer.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
hung_task.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c kernel: kallsyms: memory override issue, need check destination buffer length 2013-04-15 15:17:26 +09:30
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks locking: Fix copy/paste errors of "ARCH_INLINE_*_UNLOCK_BH" 2013-05-28 08:50:00 +02:00
Kconfig.preempt
kexec.c kexec: Use min() and min_t() to simplify logic 2013-04-30 17:04:07 -07:00
kmod.c usermodehelper: kill the sub_info->path[0] check 2013-07-03 16:08:02 -07:00
kprobes.c kprobes/x86: Call out into INT3 handler directly instead of using notifier 2013-07-23 10:12:57 +02:00
ksysfs.c
kthread.c kthread: implement probe_kthread_data() 2013-04-30 17:04:02 -07:00
latencytop.c
lglock.c
lockdep.c lockdep: remove task argument from debug_check_no_locks_held 2013-05-12 14:16:21 +02:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile printk: move to separate directory for easier modification 2013-07-31 14:41:03 -07:00
modsign_certificate.S
modsign_pubkey.c
module-internal.h
module.c Nothing interesting. Except the most embarrassing bugfix ever. But let's 2013-07-10 14:51:41 -07:00
module_signing.c
mutex-debug.c
mutex-debug.h
mutex.c mutex: Move ww_mutex definitions to ww_mutex.h 2013-07-12 12:07:46 +02:00
mutex.h
notifier.c
nsproxy.c proc: Split the namespace stuff out into linux/proc_ns.h 2013-05-01 17:29:39 -04:00
padata.c
panic.c The majority of the changes here are cleanups for the large changes that 2013-07-11 09:02:09 -07:00
params.c There is no /sys/parameters 2013-07-02 15:38:19 +09:30
pid.c kernel/pid.c: move statement 2013-07-03 16:08:05 -07:00
pid_namespace.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -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 posix-timers: Remove unused variable 2013-04-18 12:51:19 +02:00
profile.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
ptrace.c Revert "ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)" 2013-08-06 13:16:32 -07:00
range.c range: Do not add new blank slot with add_range_with_merge 2013-06-18 11:32:10 -05:00
rcu.h
rcupdate.c Merge branches 'cbnum.2013.06.10a', 'doc.2013.06.10a', 'fixes.2013.06.10a', 'srcu.2013.06.10a' and 'tiny.2013.06.10a' into HEAD 2013-06-10 13:46:44 -07:00
rcutiny.c rcu: Shrink TINY_RCU by reworking CPU-stall ifdefs 2013-06-10 13:45:53 -07:00
rcutiny_plugin.h rcu: Shrink TINY_RCU by reworking CPU-stall ifdefs 2013-06-10 13:45:53 -07:00
rcutorture.c rcu: delete __cpuinit usage from all rcu files 2013-07-14 19:36:58 -04:00
rcutree.c rcu: delete __cpuinit usage from all rcu files 2013-07-14 19:36:58 -04:00
rcutree.h rcu: delete __cpuinit usage from all rcu files 2013-07-14 19:36:58 -04:00
rcutree_plugin.h rcu: delete __cpuinit usage from all rcu files 2013-07-14 19:36:58 -04:00
rcutree_trace.c rcutrace: single_open() leaks 2013-05-05 00:16:35 -04:00
reboot.c reboot: move arch/x86 reboot= handling to generic kernel 2013-07-09 10:33:29 -07:00
relay.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
res_counter.c
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 locking/rtmutex/tester: Set correct permissions on sysfs files 2013-04-10 14:48:37 +02:00
rtmutex.c rtmutex: Document rt_mutex_adjust_prio_chain() 2013-05-28 09:23:52 +02:00
rtmutex.h
rtmutex_common.h
rwsem.c Revert "rw_semaphore: remove up/down_read_non_owner" 2013-03-23 15:53:52 -07:00
seccomp.c seccomp: allow BPF_XOR based ALU instructions. 2013-03-26 11:07:19 +11:00
semaphore.c semaphore: use `bool' type for semaphore_waiter's up 2013-04-30 17:04:08 -07:00
signal.c sigtimedwait: use freezable blocking call 2013-05-12 14:16:23 +02:00
smp.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
smpboot.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
smpboot.h
softirq.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
spinlock.c
srcu.c
stacktrace.c
stop_machine.c
sys.c reboot: move shutdown/reboot related functions to kernel/reboot.c 2013-07-09 10:33:29 -07:00
sys_ni.c unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
sysctl.c sysctl: range checking in do_proc_dointvec_ms_jiffies_conv 2013-07-26 14:22:10 -07:00
sysctl_binary.c kernel: remove unnecessary head file 2013-06-26 18:01:46 +09:00
task_work.c
taskstats.c
test_kprobes.c kernel/: rename random32() to prandom_u32() 2013-04-29 18:28:42 -07:00
time.c sched: Rename sched.c as sched/core.c in comments and Documentation 2013-06-19 12:58:42 +02:00
timeconst.bc
timer.c kernel: delete __cpuinit usage from all core kernel files 2013-07-14 19:36:59 -04:00
tracepoint.c Tracing updates for Linux 3.10 2013-04-29 13:55:38 -07:00
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-05-01 17:51:54 -07:00
user_namespace.c userns: limit the maximum depth of user_namespace->parent chain 2013-08-08 13:11:39 -07:00
utsname.c proc: Split the namespace stuff out into linux/proc_ns.h 2013-05-01 17:29:39 -04:00
utsname_sysctl.c
wait.c Fix __wait_on_atomic_t() to call the action func if the counter != 0 2013-07-23 15:46:48 -07:00
watchdog.c watchdog: Make it work under full dynticks 2013-07-30 22:29:15 +02:00
workqueue.c Merge branch 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2013-08-06 13:58:34 -07:00
workqueue_internal.h sched: Rename sched.c as sched/core.c in comments and Documentation 2013-06-19 12:58:42 +02:00