linux-kernel - Re: [PATCH] sched/deadline: do not try to push tasks if pinned task switches to dl

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Date:	Fri, 10 Oct 2014 18:26:42 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Wanpeng Li <wanpeng.li@...ux.intel.com>
CC:	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@....com>,
	Kirill V Tkhai <tkhai@...dex.ru>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/deadline: do not try to push tasks if pinned task
 switches to dl


于 10/10/14, 6:10 PM, Peter Zijlstra 写道:
> On Fri, Oct 10, 2014 at 10:43:17AM +0800, Wanpeng Li wrote:
>> As Kirill mentioned(https://lkml.org/lkml/2013/1/29/118):
>> | If rq has already had 2 or more pushable tasks and we try to add a
>> | pinned task then call of push_rt_task will just waste a time.
>>
>> Just switched pinned task is not able to be pushed. If the rq had had
>> several dl tasks before they have already been considered as candidates
>> to be pushed (or pulled). This patch does the same behavior as rt class
>> which introduced by commit 104479 (sched/rt: Do not try to push tasks
>> if pinned task switches to RT).
> Checkpatch rightly complains:
>
> ERROR: Please use 12 or more chars for the git commit ID like: 'commit 10447917551e ("sched/rt: Do not try to push tasks if pinned task switches to RT")'
> #12:
> which introduced by commit 104479 (sched/rt: Do not try to push tasks

I also got this warning before send out the patch, however, I check 6 
chars is enough for this commit. Anyway, I will send a newer version later.

Regards,
Wanpeng Li

>
>
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