Messages in this thread |  | | Date | Tue, 21 Oct 2014 21:39:26 +0800 | From | Wanpeng Li <> | Subject | Re: [PATCH 2/2] sched/deadline: don't need to balance during wakeup if wakee is pinned |
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Hi Juri,
于 10/21/14, 9:29 PM, Juri Lelli 写道: > Hi, > > On 21/10/14 13:19, Wanpeng Li wrote: >> 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; >>> > Apart from the encoding of the resend, it looks good, thanks!
What's your meaning of resend? Do you mean this one?
https://lkml.org/lkml/2014/10/10/425
I'm afraid they are different patches.
Regards, Wanpeng Li
> > Best, > > - Juri >
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