linux-kernel - Re: [PATCH v4 0/4] Add support for S3 non-stop TSC support.

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Date:	Wed, 13 Mar 2013 12:17:25 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Feng Tang <feng.tang@...el.com>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	x86@...nel.org, Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-kernel@...r.kernel.org, gong.chen@...ux.intel.com
Subject: Re: [PATCH v4 0/4] Add support for S3 non-stop TSC support.

On 03/11/2013 08:56 PM, Feng Tang wrote:
> Hi All,
>
> On some new Intel Atom processors (Penwell and Cloverview), there is
> a feature that the TSC won't stop in 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.h and timekeeping.c to support and utilizing
> it.
>
> The major change to timekeeping is the way to count suspended time,
> current way is trying to use the persistent clock first, and then
> try the rtc if persistent clock can't do it. This patch will change
> the trying order to:
> 	suspend-nonstop clocksource -> persistent clock -> rtc
>
> Please help to review them, thanks a lot!
>

Thanks!

I've gone ahead and queued these, with my minor modifications, for 3.10 
(pending further testing).

thanks
-john



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