linux-kernel - Re: [PATCH] intel_idle: disable NHM/WSM HW C-state auto-demotion (v3)

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Message-ID: <AANLkTinVCvUkmX3pnSy_Ah3fOm6hV-jAPrQXAQ971xnS@mail.gmail.com>
Date:	Sun, 27 Feb 2011 17:17:53 +0100
From:	Pierre Tardy <tardyp@...il.com>
To:	Len Brown <lenb@...nel.org>
Cc:	linux-pm@...ts.linux-foundation.org, x86@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] intel_idle: disable NHM/WSM HW C-state auto-demotion (v3)

On Wed, Feb 16, 2011 at 7:22 AM, Len Brown <lenb@...nel.org> wrote:
> From: Len Brown <len.brown@...el.com>
>
> Hardware C-state auto-demotion is a mechanism where the HW overrides
> the OS C-state request, instead demoting to a shallower state,
> which is less expensive, but saves less power.
I'm interrested, for pytimechart, to have trace information of what
actual c-state got reached after each idle request.
Do you have any info on how to get that?

Regards
Pierre
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