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| author |   Peter Zijlstra <peterz@infradead.org> | 2018-01-16 20:51:06 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-02-06 10:20:31 +0100 |
| commit | b85c8b71bf8de36a88f338f406f02a8cb48c5c3b (patch) | |
| tree | d9df9a5f4ad7b07e139adeb9655adabb010cf675 /kernel/sched/stats.h | |
| parent | membarrier/selftest: Test private expedited sync core command (diff) | |
| download | linux-dev-b85c8b71bf8de36a88f338f406f02a8cb48c5c3b.tar.xz linux-dev-b85c8b71bf8de36a88f338f406f02a8cb48c5c3b.zip | |
sched/core: Optimize ttwu_stat()
The whole of ttwu_stat() is guarded by a single schedstat_enabled(),
there is absolutely no point in then issuing another static_branch for
every single schedstat_inc() in there.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/stats.h')
| -rw-r--r-- | kernel/sched/stats.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h index baf500d12b7c..61500bb97ed8 100644 --- a/kernel/sched/stats.h +++ b/kernel/sched/stats.h @@ -31,6 +31,7 @@ rq_sched_info_dequeued(struct rq *rq, unsigned long long delta) rq->rq_sched_info.run_delay += delta; } #define schedstat_enabled() static_branch_unlikely(&sched_schedstats) +#define __schedstat_inc(var) do { var++; } while (0) #define schedstat_inc(var) do { if (schedstat_enabled()) { var++; } } while (0) #define schedstat_add(var, amt) do { if (schedstat_enabled()) { var += (amt); } } while (0) #define schedstat_set(var, val) do { if (schedstat_enabled()) { var = (val); } } while (0) @@ -48,6 +49,7 @@ static inline void rq_sched_info_depart(struct rq *rq, unsigned long long delta) {} #define schedstat_enabled() 0 +#define __schedstat_inc(var) do { } while (0) #define schedstat_inc(var) do { } while (0) #define schedstat_add(var, amt) do { } while (0) #define schedstat_set(var, val) do { } while (0) |