Messages in this thread |  | | | Date | Mon, 9 Feb 2009 11:56:00 -0800 | | From | Andrew Morton <> | | Subject | Re: [patch]: fixing of pmtimer overflow that make Cx states time incorrect |
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On Mon, 02 Feb 2009 09:46:57 +0800 "alex.shi" <alex.shi@intel.com> wrote:
> Yagui want to give a clear explanation to be used for commitment. So I resend > this again. > > On most boxes the ACPI PM timer is 24-bit counter that runs on 3.579545MHz > clock. In such case the max C-state sleep time should be less than 4687ms when > it is used to record C2/C3 duration time. > But on some boxes the max C-state sleep time is more than 4687ms. In such > case the overflow happens and the C-state duration time can't be counted > accurately. > > Use clocksource to get the C-state time instead of ACPI PM timer. and use > div64_u64 to convert US_TO_PM_TIME_TICKS in i386 mode.
It seems that this bugfix was not applied, a cleanup patch was merged instead and this patch is now wrecked.
I'll need to drop it, sorry.
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