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Message-Id: <1425961200-3809-1-git-send-email-wanpeng.li@linux.intel.com> Date: Tue, 10 Mar 2015 12:20:00 +0800 From: Wanpeng Li <wanpeng.li@...ux.intel.com> To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: Juri Lelli <juri.lelli@....com>, linux-kernel@...r.kernel.org, Wanpeng Li <wanpeng.li@...ux.intel.com> Subject: [PATCH] sched/deadline: add rq->clock update skip for dl task yield This patch add rq->clock update skip for dl task yield to tell update_rq_clock() that we've just updated, so we don't do microscopic update in schedule() and double the fastpath cost. Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com> --- kernel/sched/deadline.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 1ed6928..c397e6b 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -968,6 +968,12 @@ 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 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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