Commit-ID: f4e9d94a5bf60193d45f92b136e3d166be3ec8d5 Gitweb: http://git.kernel.org/tip/f4e9d94a5bf60193d45f92b136e3d166be3ec8d5 Author: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx> AuthorDate: Tue, 14 Oct 2014 10:22:40 +0800 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Tue, 28 Oct 2014 10:48:02 +0100 sched/deadline: Don't 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@xxxxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/1413253360-5318-2-git-send-email-wanpeng.li@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/sched/deadline.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index fab3bf8..2e31a30 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -933,6 +933,9 @@ 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; -- 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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