Commit f4e9d94a authored Oct 14, 2014 by Wanpeng Li Committed by Ingo Molnar Oct 28, 2014

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@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1413253360-5318-2-git-send-email-wanpeng.li@linux.intel.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 1d7e974c

kernel/sched/deadline.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;