Commit-ID: f4e9d94a5bf60193d45f92b136e3d166be3ec8d5 Gitweb: http://git.kernel.org/tip/f4e9d94a5bf60193d45f92b136e3d166be3ec8d5 Author: Wanpeng Li <[email protected]> AuthorDate: Tue, 14 Oct 2014 10:22:40 +0800 Committer: Ingo Molnar <[email protected]> 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 <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Linus Torvalds <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- 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-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
