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author | Wanpeng Li <wanpeng.li@linux.intel.com> | 2015-03-10 12:20:00 +0800 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-03-10 05:46:50 +0100 |
commit | 44fb085bfa17628c6d2aaa6af6b292a8499e9cbd (patch) | |
tree | b36a7e11fa7cb3bf9dfb86c56c72431ab86b773e /kernel/sched/deadline.c | |
parent | 1e78cdbd9b2266503339accafe0ebdd99b93a531 (diff) | |
download | linux-stable-44fb085bfa17628c6d2aaa6af6b292a8499e9cbd.tar.gz linux-stable-44fb085bfa17628c6d2aaa6af6b292a8499e9cbd.tar.bz2 linux-stable-44fb085bfa17628c6d2aaa6af6b292a8499e9cbd.zip |
sched/deadline: Add rq->clock update skip for dl task yield
This patch adds rq->clock update skip for SCHED_DEADLINE task yield,
to tell update_rq_clock() that we've just updated the clock, so that
we don't do a microscopic update in schedule() and double the
fastpath cost.
Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1425961200-3809-1-git-send-email-wanpeng.li@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/deadline.c')
-rw-r--r-- | kernel/sched/deadline.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 3fa8fa6d9403..0a81a954c041 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -914,6 +914,12 @@ static void yield_task_dl(struct rq *rq) } update_rq_clock(rq); update_curr_dl(rq); + /* + * Tell update_rq_clock() that we've just updated, + * so we don't do microscopic update in schedule() + * and double the fastpath cost. + */ + rq_clock_skip_update(rq, true); } #ifdef CONFIG_SMP |