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| author |   Peter Zijlstra <peterz@infradead.org> | 2016-01-26 12:15:37 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-01-29 08:35:29 +0100 |
| commit | 07c4a776135ea6d808ea19aabeb51de6b8648402 (patch) | |
| tree | 27f3b4abc0ab0f77cca1040890723707f222f382 /kernel/events/core.c | |
| parent | perf: Remove __free_event() (diff) | |
| download | linux-dev-07c4a776135ea6d808ea19aabeb51de6b8648402.tar.xz linux-dev-07c4a776135ea6d808ea19aabeb51de6b8648402.zip | |
perf: Update locking order
Update the locking order to note that ctx::lock nests inside of
child_mutex, as per:
perf_ioctl(): ctx::mutex
-> perf_event_for_each(): event::child_mutex
-> _perf_event_enable(): ctx::lock
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | kernel/events/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 024adf0e34eb..d345964c2bd6 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -1086,8 +1086,8 @@ static void put_ctx(struct perf_event_context *ctx) * Lock order: * task_struct::perf_event_mutex * perf_event_context::mutex - * perf_event_context::lock * perf_event::child_mutex; + * perf_event_context::lock * perf_event::mmap_mutex * mmap_sem */ |