Re: [tip:sched/urgent] sched: Optimize task_sched_runtime()

[Davidlohr Bueso]

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@xxxxxxxxxxxxx>
> AuthorDate: Mon, 11 Nov 2013 18:21:56 +0100
> Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
> 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@xxxxxxxxxx>
> Suggested-by: Paul Turner <pjt@xxxxxxxxxx>
> Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Link: http://lkml.kernel.org/r/20131111172925.GG26898@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>

For what it's worth:

Tested-by: Davidlohr Bueso <davidlohr@xxxxxx>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/