From: Andrew Morton <akpm@linux-foundation.org>
To: alex.shi@intel.com
Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>,
Len Brown <lenb@kernel.org>
Subject: Re: [patch]: fixing of pmtimer overflow that make Cx states time incorrect
Date: Mon, 9 Feb 2009 11:56:00 -0800 [thread overview]
Message-ID: <20090209115600.4ecd65e5.akpm@linux-foundation.org> (raw)
In-Reply-To: <1233539217.4069.24.camel@alexs-hp>
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.
next prev parent reply other threads:[~2009-02-09 19:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1232342024.21839.6.camel@alexs-hp>
2009-01-27 6:52 ` [patch]: fixing of pmtimer overflow that make Cx states time incorrect Andrew Morton
2009-02-01 2:04 ` yakui_zhao
2009-02-01 10:03 ` alex.shi
2009-02-02 1:46 ` alex.shi
2009-02-03 6:18 ` yakui_zhao
2009-02-03 7:24 ` Andrew Morton
2009-02-09 19:56 ` Andrew Morton [this message]
2009-02-10 3:37 ` alex.shi
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