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Date: Tue, 14 Oct 2014 10:22:40 +0800 From: Wanpeng Li <wanpeng.li@...ux.intel.com> To: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: linux-kernel@...r.kernel.org, Wanpeng Li <wanpeng.li@...ux.intel.com> Subject: [PATCH 2/2] sched/deadline: don't need to balance during wakeup if wakee is pinned Use nr_cpus_allowed to bail from select_task_rq() when only one cpu can be used, and saves some cycles for pinned tasks. Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com> --- kernel/sched/deadline.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index f46b7f1..5874bf8 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -914,6 +914,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int sd_flag, int flags) struct task_struct *curr; struct rq *rq; + if (p->nr_cpus_allowed == 1) + goto out; + if (sd_flag != SD_BALANCE_WAKE) goto out; -- 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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