linux-kernel - Re: [PATCH] cpuidle: Fix the CPU stuck at C0 for 2-3s after PM

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Date:	Thu, 14 Aug 2014 15:13:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Liu, Changcheng" <changcheng.liu@...el.com>,
	"Wang, Xiaoming" <xiaoming.wang@...el.com>,
	"Chakravarty, Souvik K" <souvik.k.chakravarty@...el.com>
Subject: Re: [PATCH] cpuidle: Fix the CPU stuck at C0 for 2-3s after PM_QOS
 back to DEFAULT

On Thu, Aug 14, 2014 at 11:24:06AM +0000, Liu, Chuansheng wrote:
> If inspecting the polling flag, we can not fix the race between poll_idle and smp_callback,
> since in poll_idle(), before set polling flag, if the smp_callback come in, then no resched bit set,
> after that, poll_idle() will do the polling action, without reselection immediately, it will bring power
> regression here.

-ENOPARSE. Is there a question there?

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