linux-kernel - Re: kacpi_notify_wq and kacpid

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Date:	Fri, 22 Jan 2010 22:45:15 +0330
From:	Ali Gholami Rudi <aligrudi@...il.com>
To:	astarikovskiy@...e.de, ali@...i.ir
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	lenb@...nel.org
Subject: Re: kacpi_notify_wq and kacpid_wq use a lot of cpu

Alexey Starikovskiy <astarikovskiy@...e.de> wrote:
> > Sometimes kacpi_notify_wq and kacpid_wq workqueues use a lot of cpu.
> > 
> > I'm using yesterday's tip.  At times kacpi_notify_wq uses 30-50% of
> > my cpu and kacpid_wq uses 3-5%:
> > 
> > # uptime
> >  12:49:54 up  4:16,  1 user,  load average: 0.52, 0.55, 0.40
> > # ps -e | grep kacpi
> >   189 ?        00:00:52 kacpid
> >   190 ?        00:10:26 kacpi_notify
> >   191 ?        00:00:00 kacpi_hotplug
> > 
> > This sometimes happens after a few hours of uptime; so this is
> > very hard to bisect (by the way, I think the same thing causes
> > the fans to work fullspeed sometimes when I reboot the machine).
> > I tried this patch to find out which of the callers of
> > acpi_os_execute() is the culprit:
> > 
> > Is there something I can do to trace the problem? dmesg and lspci
> > are attached.
>
> Please open new bug at bugzilla.kernel.org, for ACPI. 

http://bugzilla.kernel.org/show_bug.cgi?id=15106

> It would help if you provide name of your machine (make?)

This is a hp-compaq 610 laptop.

> and acpidump output.

Attached to the bugzilla report.

> Do you know the kernel, there this problem did not occur (is it a regression)?

The oldest kernel I tried on this machine was something after 2.6.32
and it had the same problem.

Thanks,
Ali

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