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| author | Wanpeng Li <wanpeng.li@linux.intel.com> | 2014-10-14 10:22:40 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-10-28 10:48:02 +0100 |
| commit | f4e9d94a5bf60193d45f92b136e3d166be3ec8d5 (patch) | |
| tree | cc5b69ef98a81450aff3d548b155b293b047ca30 /kernel/sched | |
| parent | 1d7e974cbf2fce2683f34ff33c173fd7ef5478c7 (diff) | |
| download | blackbird-obmc-linux-f4e9d94a5bf60193d45f92b136e3d166be3ec8d5.tar.gz blackbird-obmc-linux-f4e9d94a5bf60193d45f92b136e3d166be3ec8d5.zip | |
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>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/deadline.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index fab3bf81bb7c..2e31a30e623c 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; |
