linux-kernel - Re: [RFC PATCH 0/5] Add support for S3 non-stop TSC support.

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Message-ID: <50FD48B6.9010202@intel.com>
Date:	Mon, 21 Jan 2013 14:55:02 +0100
From:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:	Feng Tang <feng.tang@...el.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, x86@...nel.org,
	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] Add support for S3 non-stop TSC support.

On 1/21/2013 7:38 AM, Feng Tang wrote:
> Hi All,
>
> On some new Intel Atom processors (Penwell and Cloverview), there is
> a feature that the TSC won't stop S3, say the TSC value won't be
> reset to 0 after resume. This feature makes TSC a more reliable
> clocksource and could benefit the timekeeping code during system
> suspend/resume cycles.
>
> The enabling efforts include adding new flags for this feature,
> modifying clocksource.c and timekeeping.c to support and utilizing
> it.
>
> One remaining question is inside the timekeeping_resume(), we don't
> know if it is called by resuming from suspend(s2ram) or from
> hibernate(s2disk), as there is no easy way to check it currently.
> But it doesn't hurt as these Penwell/Cloverview platforms only have
> S3 state, and no S4.
>
> Please help to review them, thanks!

The patches look reasonable to me.

Thanks,
Rafael

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