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Message-ID: <CANRm+CwmtRXSch0DSok+pKs=LzCHQayMy5PBObNtAx_d7m9jQw@mail.gmail.com>
Date: Sun, 22 May 2016 15:27:18 +0800
From: Wanpeng Li <kernellwp@...il.com>
To: Mike Galbraith <mgalbraith@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Pavan Kondeti <pkondeti@...eaurora.org>,
Ben Segall <bsegall@...gle.com>,
Matt Fleming <matt@...eblueprint.co.uk>,
Morten Rasmussen <morten.rasmussen@....com>,
Paul Turner <pjt@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Byungchul Park <byungchul.park@....com>,
Andrew Hunter <ahh@...gle.com>
Subject: Re: [PATCH 2/3] sched,fair: Fix local starvation
2016-05-22 15:15 GMT+08:00 Mike Galbraith <mgalbraith@...e.de>:
> On Sun, 2016-05-22 at 14:50 +0800, Wanpeng Li wrote:
>> 2016-05-21 22:04 GMT+08:00 Mike Galbraith <mgalbraith@...e.de>:
>> > On Tue, 2016-05-10 at 19:43 +0200, Peter Zijlstra wrote:
>> >
>> > (Evolution authors must either not do patch review, or use some other
>> > mailer. Squint hard, this crud really is your patch;)
>> >
>> > > --- a/kernel/sched/core.c
>> > > +++ b/kernel/sched/core.c
>> > >
>> > > @@ -1762,7 +1770,11 @@ void sched_ttwu_pending(void)
>> > > > > while (llist) {
>> > > > > > p = llist_entry(llist, struct task_struct, wake_entry);
>> > > > > > llist = llist_next(llist);
>> > > -> > > ttwu_do_activate(rq, p, 0, cookie);
>> > > +> > > /*
>> > > +> > > * See ttwu_queue(); we only call ttwu_queue_remote() when
>> > > +> > > * its a x-cpu wakeup.
>> > > +> > > */
>> > > +> > > ttwu_do_activate(rq, p, WF_MIGRATED, cookie);
>> >
>> > Wakees that were not migrated/normalized eat an unwanted min_vruntime,
>>
>> Why there were wakees queued by twu_queue_remote() not migrated?
>
> Queuing to a remote cache domain implies x-cpu wakeup, but does not
> imply migration.
What's the meaning of 'x-cpu wakeup'? ;-)
Regards,
Wanpeng Li
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