linux-kernel - Re: [PATCH] cpuidle/powernv: Enter fastsleep on checking if deep idle states are allowed

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Date:	Mon, 15 Sep 2014 08:23:16 -0400
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Michael Ellerman <mpe@...erman.id.au>, mikey@...ling.org,
	linux-pm@...r.kernel.org, rjw@...ysocki.net,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] cpuidle/powernv: Enter fastsleep on checking if deep
 idle states are allowed

On Mon, 2014-09-15 at 14:22 +0530, Preeti U Murthy wrote:
> > We were talking about getting rid of powersave_nap altogether, but I
> think we
> > decided we couldn't, I forget.
> 
> Isn't this a helpful knob to disable cpuidle at runtime? Currently we
> check the value of powersave_nap before entering both nap and
> fastsleep.

It's useful when diagnosing some problems that can be caused by idle
states.

Cheers,
Ben.


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