linux-kernel - RE: [PATCH 2/3] smp: re-implement the kick_all_cpus_sync() with wake_up_if

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Date:	Mon, 18 Aug 2014 00:12:39 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Ingo Molnar" <mingo@...hat.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <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 2/3] smp: re-implement the kick_all_cpus_sync() with
 wake_up_if_idle()

Hello Andy,

> -----Original Message-----
> From: Andy Lutomirski [mailto:luto@...capital.net]
> Sent: Friday, August 15, 2014 11:41 PM
> To: Liu, Chuansheng
> Cc: Peter Zijlstra; Daniel Lezcano; Rafael J. Wysocki; Ingo Molnar;
> linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; Liu, Changcheng;
> Wang, Xiaoming; Chakravarty, Souvik K
> Subject: Re: [PATCH 2/3] smp: re-implement the kick_all_cpus_sync() with
> wake_up_if_idle()
> 
> On Fri, Aug 15, 2014 at 12:01 AM, Chuansheng Liu
> <chuansheng.liu@...el.com> wrote:
> > Currently using smp_call_function() just woke up the corresponding
> > cpu, but can not break the polling idle loop.
> >
> > Here using the new sched API wake_up_if_idle() to implement it.
> 
> kick_all_cpus_sync has other callers, and those other callers want the
> old behavior.  I think this should be a new function.
> 
Yes, seems some current users of kick_all_cpus_sync() need IPI indeed,
will try to send out patch V2 with one new function.