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authorPeter Zijlstra <peterz@infradead.org>2012-02-11 09:05:00 +0400
committerIngo Molnar <mingo@kernel.org>2014-02-10 19:17:13 +0400
commit606dba2e289446600a0b68422ed2019af5355c12 (patch)
tree286562f6ddcca34f3f029b68507b820f0c81b707 /kernel/sched/stop_task.c
parentfed14d45f945042a15b09de48d7d3d58d9455fc4 (diff)
downloadlinux-606dba2e289446600a0b68422ed2019af5355c12.tar.xz
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/stop_task.c')
-rw-r--r--kernel/sched/stop_task.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index fdb6bb0b3356..a4147c9d2017 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -23,16 +23,20 @@ check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags)
/* we're never preempted */
}
-static struct task_struct *pick_next_task_stop(struct rq *rq)
+static struct task_struct *
+pick_next_task_stop(struct rq *rq, struct task_struct *prev)
{
struct task_struct *stop = rq->stop;
- if (stop && stop->on_rq) {
- stop->se.exec_start = rq_clock_task(rq);
- return stop;
- }
+ if (!stop || !stop->on_rq)
+ return NULL;
- return NULL;
+ if (prev)
+ prev->sched_class->put_prev_task(rq, prev);
+
+ stop->se.exec_start = rq_clock_task(rq);
+
+ return stop;
}
static void