From: Peter Zijlstra <peterz@infradead.org>
To: "Liu, Chuansheng" <chuansheng.liu@intel.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Liu, Changcheng" <changcheng.liu@intel.com>,
"Wang, Xiaoming" <xiaoming.wang@intel.com>,
"Chakravarty, Souvik K" <souvik.k.chakravarty@intel.com>
Subject: Re: [PATCH] cpuidle: Fix the CPU stuck at C0 for 2-3s after PM_QOS back to DEFAULT
Date: Thu, 14 Aug 2014 15:13:04 +0200 [thread overview]
Message-ID: <20140814131304.GK16043@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <27240C0AC20F114CBF8149A2696CBE4A01E5B61C@SHSMSX101.ccr.corp.intel.com>
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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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next prev parent reply other threads:[~2014-08-14 13:13 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-14 2:11 [PATCH] cpuidle: Fix the CPU stuck at C0 for 2-3s after PM_QOS back to DEFAULT Chuansheng Liu
[not found] ` <CAKnoXLw3DrBAxCUWEkXtvCTf+E1w0xTHJSiSUY6Qd6xHXeGaoQ@mail.gmail.com>
2014-08-14 10:53 ` Peter Zijlstra
2014-08-14 11:24 ` Liu, Chuansheng
2014-08-14 13:13 ` Peter Zijlstra [this message]
2014-08-14 14:10 ` Liu, Chuansheng
2014-08-14 14:17 ` Daniel Lezcano
2014-08-14 14:26 ` Liu, Chuansheng
2014-08-14 11:00 ` Peter Zijlstra
2014-08-14 11:14 ` Daniel Lezcano
2014-08-14 11:17 ` Liu, Chuansheng
2014-08-14 12:41 ` Peter Zijlstra
2014-08-14 13:29 ` Daniel Lezcano
2014-08-14 13:57 ` Liu, Chuansheng
2014-08-14 21:12 ` Andy Lutomirski
2014-08-14 21:16 ` Peter Zijlstra
2014-08-14 21:22 ` Andy Lutomirski
2014-08-15 1:21 ` Liu, Chuansheng
2014-08-15 1:27 ` Andy Lutomirski
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