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

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Message-ID: <CABawtvN-rO+YAy55+W-oxgtibh=9ZDnqNMGcreg6u==C3Cr7xA@mail.gmail.com>
Date:	Mon, 7 Oct 2013 12:57:54 +0800
From:	Ethan Zhao <ethan.kernel@...il.com>
To:	Mike Galbraith <bitbucket@...ine.de>
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 <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org, Len Brown <lenb@...nel.org>
Subject: Re: [PATCH V3]hrtimer: Fix a performance regression by disable
 reprogramming in remove_hrtimer

Got it.

On Mon, Oct 7, 2013 at 12:41 PM, Mike Galbraith <bitbucket@...ine.de> wrote:
> 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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