Commit-ID: 2509940fd71c2e2915a05052bbdbf2d478364184
Gitweb: http://git.kernel.org/tip/2509940fd71c2e2915a05052bbdbf2d478364184
Author: Alex Shi <alex.shi@xxxxxxxxx>
AuthorDate: Thu, 20 Jun 2013 10:18:55 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 27 Jun 2013 10:07:41 +0200
sched/cfs_rq: Change atomic64_t removed_load to atomic_long_t
Similar to runnable_load_avg, blocked_load_avg variable, long type is
enough for removed_load in 64 bit or 32 bit machine.
Then we avoid the expensive atomic64 operations on 32 bit machine.
Signed-off-by: Alex Shi <alex.shi@xxxxxxxxx>
Reviewed-by: Paul Turner <pjt@xxxxxxxxxx>
Tested-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1371694737-29336-12-git-send-email-alex.shi@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 10 ++++++----
kernel/sched/sched.h | 3 ++-
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 30ccc37..b43474a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1517,8 +1517,9 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
if (!decays && !force_update)
return;
- if (atomic64_read(&cfs_rq->removed_load)) {
- u64 removed_load = atomic64_xchg(&cfs_rq->removed_load, 0);
+ if (atomic_long_read(&cfs_rq->removed_load)) {
+ unsigned long removed_load;
+ removed_load = atomic_long_xchg(&cfs_rq->removed_load, 0);
subtract_blocked_load_contrib(cfs_rq, removed_load);
}
@@ -3480,7 +3481,8 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu)
*/
if (se->avg.decay_count) {
se->avg.decay_count = -__synchronize_entity_decay(se);
- atomic64_add(se->avg.load_avg_contrib, &cfs_rq->removed_load);
+ atomic_long_add(se->avg.load_avg_contrib,
+ &cfs_rq->removed_load);
}
}
#endif /* CONFIG_SMP */
@@ -5942,7 +5944,7 @@ void init_cfs_rq(struct cfs_rq *cfs_rq)
#endif
#ifdef CONFIG_SMP
atomic64_set(&cfs_rq->decay_counter, 1);
- atomic64_set(&cfs_rq->removed_load, 0);
+ atomic_long_set(&cfs_rq->removed_load, 0);
#endif
}
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 5585eb2..7059919 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -278,8 +278,9 @@ struct cfs_rq {
* the FAIR_GROUP_SCHED case).
*/
unsigned long runnable_load_avg, blocked_load_avg;
- atomic64_t decay_counter, removed_load;
+ atomic64_t decay_counter;
u64 last_decay;
+ atomic_long_t removed_load;
#ifdef CONFIG_FAIR_GROUP_SCHED
/* Required to track per-cpu representation of a task_group */
--
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