linux-kernel - Re: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1

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Message-ID: <CABeCy1aUztmELNiD59L1cDj_KPPBYn=UYiF-Nu=K5sdeH3T2Sg@mail.gmail.com>
Date:	Thu, 23 Feb 2012 12:04:45 -0800
From:	Venki Pallipadi <venki@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts
 to an idle CPU -v1

[ Resending without the ugly email client formatting ]

On Thu, Feb 23, 2012 at 1:08 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, 2012-02-23 at 08:50 +0100, Ingo Molnar wrote:
>> * Venkatesh Pallipadi <venki@...gle.com> wrote:
>
>> > * We can also eliminate TS_POLLING flag in favor of this. But, that will have
>> >   a lot more touchpoints and better done as a standlone change.
>>
>> Should most definitely be done for this series to be acceptble -
>> as a preparatory patch in the series, with the feature at the
>> end of the series.
>
> I don't think you can, TS_POLLING still works for idle=poll, whereas
> this new stuff requires monitor/mwait.
>

Even poll_idle should be able to use this ipiless_wakeup. It just have
to poll for an additional IPI_PENDING bit along with need_resched.
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