linux-kernel - Re: [PATCH] cpuidle: move field disable from per-driver to per-cpu

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Message-ID: <20120614144127.GA2612@ti119.telemetry-investments.com>
Date:	Thu, 14 Jun 2012 10:41:27 -0400
From:	"Andrew J. Schorr" <aschorr@...emetry-investments.com>
To:	ShuoX Liu <shuox.liu@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Brown, Len" <len.brown@...el.com>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
Subject: Re: [PATCH] cpuidle: move field disable from per-driver to per-cpu

Hi,

On Thu, Jun 14, 2012 at 10:52:48AM +0800, ShuoX Liu wrote:
> Andrew J.Schorr raises a question. When he changes the disable setting
> on a single CPU, it affects all the other CPUs. Basically, currently,
> the disable field is per-driver instead of per-cpu. All the C states of
> the same driver are shared by all CPU in the same machine.
> 
> Below patch changes field disable to per-cpu, so we could set this
> separately for each cpu.

Thanks.  I have not tested this, but it looks very useful to have the
flexibility to disable certain C states on a subset of the cores.  The current
implementation affecting all cores is much less powerful.

Thanks,
Andrew
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