linux-kernel - Re: [patch 01/15] sched: (fixlet) dont update shares twice on on

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Message-ID: <BANLkTimr31i9hA375__Kw+i0GBFq5fPfvw@mail.gmail.com>
Date:	Wed, 11 May 2011 01:13:18 -0700
From:	Paul Turner <pjt@...gle.com>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [patch 01/15] sched: (fixlet) dont update shares twice on on_rq parent

On Wed, May 11, 2011 at 12:55 AM, Hidetoshi Seto
<seto.hidetoshi@...fujitsu.com> wrote:
> (2011/05/10 17:32), Mike Galbraith wrote:
>> On Tue, 2011-05-10 at 16:14 +0900, Hidetoshi Seto wrote:
>>> This small fixlet can stand alone.
>>> Peter, how about getting this into git tree first?
>>
>> tip 2f36825b176f67e5c5228aa33d828bc39718811f contains the below.
>>
>>                 /* Don't dequeue parent if it has other entities besides us */
>> -               if (cfs_rq->load.weight)
>> +               if (cfs_rq->load.weight) {
>> +                       /*
>> +                        * Bias pick_next to pick a task from this cfs_rq, as
>> +                        * p is sleeping when it is within its sched_slice.
>> +                        */
>> +                       if (task_sleep && parent_entity(se))
>> +                               set_next_buddy(parent_entity(se));
>>                         break;
>> +               }
>>                 flags |= DEQUEUE_SLEEP;
>>         }
>
> Oh, thanks Mike!
> It seems that this change in tip is better one.
>
> Paul, don't you mind rebasing your patches onto tip/sched/core next time?
> (...or is there better branch for rebase?)
>

I thought I had but apparently I missed this.

We still need to set se = parent_entity(se) to avoid the pointless
double update below.

Will definitely rebase.

Thanks!

>
> Thanks,
> H.Seto
>
>
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