Commit 44fb085b authored Mar 10, 2015 by Wanpeng Li Committed by Ingo Molnar Mar 10, 2015

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>

parent 1e78cdbd

kernel/sched/deadline.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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