linux-kernel - Re: [PATCH 2/3] smp: Adding new function wake_up_all

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Message-ID: <20140903095251.GI4783@worktop.ger.corp.intel.com>
Date:	Wed, 3 Sep 2014 11:52:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chuansheng Liu <chuansheng.liu@...el.com>
Cc:	luto@...capital.net, daniel.lezcano@...aro.org, rjw@...ysocki.net,
	mingo@...hat.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, changcheng.liu@...el.com,
	xiaoming.wang@...el.com, souvik.k.chakravarty@...el.com
Subject: Re: [PATCH 2/3] smp: Adding new function wake_up_all_cpus()

On Mon, Aug 18, 2014 at 04:37:31PM +0800, Chuansheng Liu wrote:
> Currently kick_all_cpus_sync() can break non-polling idle cpus
> thru IPI interrupts.
> 
> But sometimes we need to break the polling idle cpus immediately
> to reselect the suitable c-state, also for non-idle cpus, we need
> to do nothing if we try to wake up them.
> 
> Here adding one new function wake_up_all_cpus() to let all cpus out
> of idle based on function wake_up_if_idle().

wake_up_all_idle_cpus() ?
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