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| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2017-08-29 17:01:03 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-09-29 14:28:30 +0300 |
| commit | 5bce9db1894c998c5b85a34036d679ea6517668f (patch) | |
| tree | 98d531a881d66e722e2f275a43f4fc3681d21630 /tools/perf/scripts/python/call-graph-from-sql.py | |
| parent | 4c4de7d3c8383e3bf122cd84c61e7523df02b1ae (diff) | |
| download | linux-5bce9db1894c998c5b85a34036d679ea6517668f.tar.xz | |
perf/core: Explain perf_sched_mutex
To clarify why atomic_inc_return(&perf_sched_events) is not sufficient and
a mutex is needed to order static branch enabling vs the atomic counter
increment, this adds a comment with a short explanation.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170829140103.6563-1-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-sql.py')
0 files changed, 0 insertions, 0 deletions