linux-kernel - Re: [tip:sched/urgent] sched: Optimize task_sched

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Message-ID: <1384831002.2459.3.camel@buesod1.americas.hpqcorp.net>
Date:	Mon, 18 Nov 2013 19:16:42 -0800
From:	Davidlohr Bueso <davidlohr@...com>
To:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	pjt@...gle.com, akpm@...ux-foundation.org, tglx@...utronix.de,
	kosaki.motohiro@...fujitsu.com, lwoodman@...hat.com
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/urgent] sched: Optimize task_sched_runtime()

On Wed, 2013-11-13 at 09:25 -0800, tip-bot for Peter Zijlstra wrote:
> Commit-ID:  911b2898b3c9fe0048e9485ad1629ed4fce330fd
> Gitweb:     http://git.kernel.org/tip/911b2898b3c9fe0048e9485ad1629ed4fce330fd
> Author:     Peter Zijlstra <peterz@...radead.org>
> AuthorDate: Mon, 11 Nov 2013 18:21:56 +0100
> Committer:  Ingo Molnar <mingo@...nel.org>
> CommitDate: Wed, 13 Nov 2013 13:33:54 +0100
> 
> sched: Optimize task_sched_runtime()
> 
> Large multi-threaded apps like to hit this using do_sys_times() and
> then queue up on the rq->lock.
> 
> Avoid when possible.
> 
> Larry reported ~20% performance increase his test case.
> 
> Reported-by: Larry Woodman <lwoodman@...hat.com>
> Suggested-by: Paul Turner <pjt@...gle.com>
> Signed-off-by: Peter Zijlstra <peterz@...radead.org>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Link: http://lkml.kernel.org/r/20131111172925.GG26898@twins.programming.kicks-ass.net
> Signed-off-by: Ingo Molnar <mingo@...nel.org>

For what it's worth:

Tested-by: Davidlohr Bueso <davidlohr@...com>

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