linux-kernel - Re: [PATCH V3]hrtimer: Fix a performance regression by disable reprogramming in remove

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Date:	Mon, 07 Oct 2013 06:41:41 +0200
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Ethan Zhao <ethan.kernel@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rjw@...k.pl,
	daniel.lezcano@...aro.org, linux-pm@...r.kernel.org,
	lenb@...nel.org
Subject: Re: [PATCH V3]hrtimer: Fix a performance regression by disable
 reprogramming in remove_hrtimer

On Fri, 2013-10-04 at 20:06 +0800, Ethan Zhao wrote: 
> Mike, Peter,
>    Seems lots of work has been done these days, studious guys. those
> patches merged in last stable/dev branch (fix performance regression
> caused by extra rtimer programming and rescheduling IPI,confusing
> idle... etc) ? So I could just do a lazy pull for test with my
> environment.  I need catch up with other mail loops with my vacation
> again.

Massive timer overhead seems to have crawled off and died while I wasn't
looking.  Peter's fix for IPI woes..

tip commit ea811747 sched, idle: Fix the idle polling state logic

..hasn't yet swum upstream.

-Mike

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