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Message-Id: <20090209115600.4ecd65e5.akpm@linux-foundation.org> Date: Mon, 9 Feb 2009 11:56:00 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: alex.shi@...el.com Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>, Len Brown <lenb@...nel.org> Subject: Re: [patch]: fixing of pmtimer overflow that make Cx states time incorrect On Mon, 02 Feb 2009 09:46:57 +0800 "alex.shi" <alex.shi@...el.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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