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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>
This commit is contained in:
Wanpeng Li 2014-10-14 10:22:40 +08:00 committed by Ingo Molnar
parent 1d7e974cbf
commit f4e9d94a5b
1 changed files with 3 additions and 0 deletions
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3
kernel/sched/deadline.c
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@ -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;