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authorAlex Shi <alex.shi@intel.com>2013-06-20 10:18:55 +0800
committerIngo Molnar <mingo@kernel.org>2013-06-27 10:07:41 +0200
commit2509940fd71c2e2915a05052bbdbf2d478364184 (patch)
treee2a9466c8cca831158c18a4c4c750420b11fea30 /kernel/sched
parentbf5b986ed4d20428eeec3df4a03dbfebb9b6538c (diff)
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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@intel.com> Reviewed-by: Paul Turner <pjt@google.com> Tested-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1371694737-29336-12-git-send-email-alex.shi@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/fair.c10
-rw-r--r--kernel/sched/sched.h3
2 files changed, 8 insertions, 5 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 30ccc37112d0..b43474a964c2 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 5585eb25e9a3..705991906fbe 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 */