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authorPeter Zijlstra <peterz@infradead.org>2012-02-11 06:05:00 +0100
committerIngo Molnar <mingo@kernel.org>2014-02-10 16:17:13 +0100
commit606dba2e289446600a0b68422ed2019af5355c12 (patch)
tree286562f6ddcca34f3f029b68507b820f0c81b707 /kernel/sched/deadline.c
parentfed14d45f945042a15b09de48d7d3d58d9455fc4 (diff)
downloadop-kernel-dev-606dba2e289446600a0b68422ed2019af5355c12.zip
op-kernel-dev-606dba2e289446600a0b68422ed2019af5355c12.tar.gz
sched: Push put_prev_task() into pick_next_task()
In order to avoid having to do put/set on a whole cgroup hierarchy when we context switch, push the put into pick_next_task() so that both operations are in the same function. Further changes then allow us to possibly optimize away redundant work. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1328936700.2476.17.camel@laptop Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/deadline.c')
-rw-r--r--kernel/sched/deadline.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index b5700bc..50797d5 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -990,7 +990,7 @@ static struct sched_dl_entity *pick_next_dl_entity(struct rq *rq,
return rb_entry(left, struct sched_dl_entity, rb_node);
}
-struct task_struct *pick_next_task_dl(struct rq *rq)
+struct task_struct *pick_next_task_dl(struct rq *rq, struct task_struct *prev)
{
struct sched_dl_entity *dl_se;
struct task_struct *p;
@@ -1001,6 +1001,9 @@ struct task_struct *pick_next_task_dl(struct rq *rq)
if (unlikely(!dl_rq->dl_nr_running))
return NULL;
+ if (prev)
+ prev->sched_class->put_prev_task(rq, prev);
+
dl_se = pick_next_dl_entity(rq, dl_rq);
BUG_ON(!dl_se);
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