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| author |   Peter Zijlstra <peterz@infradead.org> | 2012-02-11 06:05:00 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2014-02-10 16:17:13 +0100 |
| commit | 606dba2e289446600a0b68422ed2019af5355c12 (patch) | |
| tree | 286562f6ddcca34f3f029b68507b820f0c81b707 /kernel/sched/stop_task.c | |
| parent | sched/fair: Track cgroup depth (diff) | |
| download | linux-dev-606dba2e289446600a0b68422ed2019af5355c12.tar.xz linux-dev-606dba2e289446600a0b68422ed2019af5355c12.zip | |
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.c | 16 |
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 |