linux-kernel - Re: [tip:sched/core] sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target

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Date:	Thu, 9 Apr 2015 09:17:55 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	tip-bot for Tim Chen <tipbot@...or.com>,
	<suruchi.a.kadu@...el.com>, <linux-kernel@...r.kernel.org>,
	<sbohrer@...advisors.com>, <peterz@...radead.org>,
	<mingo@...nel.org>, <tglx@...utronix.de>, <doug.nelson@...el.com>,
	<torvalds@...ux-foundation.org>, <tim.c.chen@...ux.intel.com>,
	<hpa@...or.com>, <stable@...r.kernel.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: [tip:sched/core] sched/rt:  Reduce rq lock contention by eliminating
 locking of non-feasible target

>> Commit-ID:  80e3d87b2c5582db0ab5e39610ce3707d97ba409
>> Gitweb:     http://git.kernel.org/tip/80e3d87b2c5582db0ab5e39610ce3707d97ba409
>> Author:     Tim Chen <tim.c.chen@...ux.intel.com>
>> AuthorDate: Fri, 12 Dec 2014 15:38:12 -0800
>> Committer:  Ingo Molnar <mingo@...nel.org>
>> CommitDate: Fri, 30 Jan 2015 19:38:49 +0100
>>
>> sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target
>>
>> This patch adds checks that prevens futile attempts to move rt tasks
>> to a CPU with active tasks of equal or higher priority.
>>
>> This reduces run queue lock contention and improves the performance of
>> a well known OLTP benchmark by 0.7%.
>>
>> Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
>> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>> Cc: Shawn Bohrer <sbohrer@...advisors.com>
>> Cc: Suruchi Kadu <suruchi.a.kadu@...el.com>
>> Cc: Doug Nelson<doug.nelson@...el.com>
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>> Link: http://lkml.kernel.org/r/1421430374.2399.27.camel@schen9-desk2.jf.intel.com
>> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> 
> I see this has been added to mainline already. I think this should go
> to stable as well. As far back as it applies. I'll even add this to the
> stable-rt if need be. But I rather pull it into stable-rt via the
> stable branches.
> 

Queued up for 3.4. Thanks!

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