Commit-ID: 07c4a776135ea6d808ea19aabeb51de6b8648402
Gitweb: http://git.kernel.org/tip/07c4a776135ea6d808ea19aabeb51de6b8648402
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Tue, 26 Jan 2016 12:15:37 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Fri, 29 Jan 2016 08:35:29 +0100
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@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 024adf0..d345964 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
*/
--
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