Commit-ID: 44fb085bfa17628c6d2aaa6af6b292a8499e9cbd Gitweb: http://git.kernel.org/tip/44fb085bfa17628c6d2aaa6af6b292a8499e9cbd Author: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx> AuthorDate: Tue, 10 Mar 2015 12:20:00 +0800 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Tue, 10 Mar 2015 05:46:50 +0100 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@xxxxxxxxxxxxxxx> Cc: Juri Lelli <juri.lelli@xxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/1425961200-3809-1-git-send-email-wanpeng.li@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/sched/deadline.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 3fa8fa6..0a81a95 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 -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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