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authorPeter Zijlstra <peterz@infradead.org>2018-01-23 20:34:30 +0100
committerIngo Molnar <mingo@kernel.org>2018-02-06 10:20:32 +0100
commit2ed41a55023dc5be6742ca0eb8df5cb20e8dcaae (patch)
tree86d013760b261d3b2c134bfc1e9b5e638b1a013b /kernel
parentb85c8b71bf8de36a88f338f406f02a8cb48c5c3b (diff)
downloadlinux-2ed41a55023dc5be6742ca0eb8df5cb20e8dcaae.tar.bz2
sched/core: Optimize update_stats_*()
These functions are already gated by schedstats_enabled(), there is no point in then issuing another static_branch for every individual update in them. 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')
-rw-r--r--kernel/sched/fair.c32
-rw-r--r--kernel/sched/stats.h4
2 files changed, 20 insertions, 16 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7b6535987500..a6b8157197bf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -871,7 +871,7 @@ update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
likely(wait_start > prev_wait_start))
wait_start -= prev_wait_start;
- schedstat_set(se->statistics.wait_start, wait_start);
+ __schedstat_set(se->statistics.wait_start, wait_start);
}
static inline void
@@ -893,17 +893,17 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
* time stamp can be adjusted to accumulate wait time
* prior to migration.
*/
- schedstat_set(se->statistics.wait_start, delta);
+ __schedstat_set(se->statistics.wait_start, delta);
return;
}
trace_sched_stat_wait(p, delta);
}
- schedstat_set(se->statistics.wait_max,
+ __schedstat_set(se->statistics.wait_max,
max(schedstat_val(se->statistics.wait_max), delta));
- schedstat_inc(se->statistics.wait_count);
- schedstat_add(se->statistics.wait_sum, delta);
- schedstat_set(se->statistics.wait_start, 0);
+ __schedstat_inc(se->statistics.wait_count);
+ __schedstat_add(se->statistics.wait_sum, delta);
+ __schedstat_set(se->statistics.wait_start, 0);
}
static inline void
@@ -928,10 +928,10 @@ update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
delta = 0;
if (unlikely(delta > schedstat_val(se->statistics.sleep_max)))
- schedstat_set(se->statistics.sleep_max, delta);
+ __schedstat_set(se->statistics.sleep_max, delta);
- schedstat_set(se->statistics.sleep_start, 0);
- schedstat_add(se->statistics.sum_sleep_runtime, delta);
+ __schedstat_set(se->statistics.sleep_start, 0);
+ __schedstat_add(se->statistics.sum_sleep_runtime, delta);
if (tsk) {
account_scheduler_latency(tsk, delta >> 10, 1);
@@ -945,15 +945,15 @@ update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
delta = 0;
if (unlikely(delta > schedstat_val(se->statistics.block_max)))
- schedstat_set(se->statistics.block_max, delta);
+ __schedstat_set(se->statistics.block_max, delta);
- schedstat_set(se->statistics.block_start, 0);
- schedstat_add(se->statistics.sum_sleep_runtime, delta);
+ __schedstat_set(se->statistics.block_start, 0);
+ __schedstat_add(se->statistics.sum_sleep_runtime, delta);
if (tsk) {
if (tsk->in_iowait) {
- schedstat_add(se->statistics.iowait_sum, delta);
- schedstat_inc(se->statistics.iowait_count);
+ __schedstat_add(se->statistics.iowait_sum, delta);
+ __schedstat_inc(se->statistics.iowait_count);
trace_sched_stat_iowait(tsk, delta);
}
@@ -1012,10 +1012,10 @@ update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
struct task_struct *tsk = task_of(se);
if (tsk->state & TASK_INTERRUPTIBLE)
- schedstat_set(se->statistics.sleep_start,
+ __schedstat_set(se->statistics.sleep_start,
rq_clock(rq_of(cfs_rq)));
if (tsk->state & TASK_UNINTERRUPTIBLE)
- schedstat_set(se->statistics.block_start,
+ __schedstat_set(se->statistics.block_start,
rq_clock(rq_of(cfs_rq)));
}
}
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 61500bb97ed8..8e7b58de61e7 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -33,7 +33,9 @@ rq_sched_info_dequeued(struct rq *rq, unsigned long long 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 { var += (amt); } while (0)
#define schedstat_add(var, amt) do { if (schedstat_enabled()) { var += (amt); } } while (0)
+#define __schedstat_set(var, val) do { var = (val); } while (0)
#define schedstat_set(var, val) do { if (schedstat_enabled()) { var = (val); } } while (0)
#define schedstat_val(var) (var)
#define schedstat_val_or_zero(var) ((schedstat_enabled()) ? (var) : 0)
@@ -51,7 +53,9 @@ 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_add(var, amt) do { } while (0)
+#define __schedstat_set(var, val) do { } while (0)
#define schedstat_set(var, val) do { } while (0)
#define schedstat_val(var) 0
#define schedstat_val_or_zero(var) 0