Re: [PATCH 2/2] sched/deadline: don't need to balance during wakeup if wakee is pinned

[Wanpeng Li]

Hi Juri,

ä 10/21/14, 9:29 PM, Juri Lelli åé:
> Hi,
>
> On 21/10/14 13:19, Wanpeng Li wrote:
> > Cc Juri,
> >
> > ä 10/14/14, 10:22 AM, Wanpeng Li åé:
> > > 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@xxxxxxxxxxxxxxx>
> > > ---
> > >   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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