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Date: Mon, 18 Nov 2013 18:59:28 -0500
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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CC: kosaki.motohiro@jp.fujitsu.com
Subject: Re: [tip:sched/urgent] sched: Optimize task_sched_runtime()
References: <20131111172925.GG26898@twins.programming.kicks-ass.net> <tip-911b2898b3c9fe0048e9485ad1629ed4fce330fd@git.kernel.org>
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On 11/13/2013 12:25 PM, tip-bot for Peter Zijlstra wrote:
> Commit-ID:  911b2898b3c9fe0048e9485ad1629ed4fce330fd
> Gitweb:     http://git.kernel.org/tip/911b2898b3c9fe0048e9485ad1629ed4fce330fd
> Author:     Peter Zijlstra <peterz@infradead.org>
> AuthorDate: Mon, 11 Nov 2013 18:21:56 +0100
> Committer:  Ingo Molnar <mingo@kernel.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@redhat.com>
> Suggested-by: Paul Turner <pjt@google.com>
> Signed-off-by: Peter Zijlstra <peterz@infradead.org>
> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Link: http://lkml.kernel.org/r/20131111172925.GG26898@twins.programming.kicks-ass.net
> Signed-off-by: Ingo Molnar <mingo@kernel.org>

Sorry for the delay. I took a vacation. As you know, this patch originally
written me, then I already tested this. So, of course,

Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

# S-O-B is better? dunno.