Messages in this thread |  | | Date | Tue, 21 Oct 2014 20:19:37 +0800 | From | Wanpeng Li <> | Subject | Re: [PATCH 2/2] sched/deadline: don't need to balance during wakeup if wakee is pinned |
| |
Cc Juri,
于 10/14/14, 10:22 AM, Wanpeng Li 写道: > 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> > --- > kernel/sched/deadline.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c > index f46b7f1..5874bf8 100644 > --- a/kernel/sched/deadline.c > +++ b/kernel/sched/deadline.c > @@ -914,6 +914,9 @@ 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 majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |