linux-kernel - Re: High latency on /sys/class/thermal

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Message-ID: <20090411231611.7c5f9b69@ua.pt>
Date:	Sat, 11 Apr 2009 23:16:11 +0100
From:	Tiago Simões Batista <tiagosbatista@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Tiago Simões Batista" <tiagosbatista@...il.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: High latency on /sys/class/thermal

Sorry about the noise, by brain was stopped when I sent the last mail,
please ignore the From address, it is wrong!

On Sat, 11 Apr 2009 12:14:16 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> (cc linux-acpi)
> 
> On Sat, 11 Apr 2009 15:56:12 +0100 "Tiago Sim__es Batista"
> <tiagosbatista@...il.com> wrote:
> 
> > Hi all
> > 
> > Yesterday, I recompiled my kernel (git + tuxonice)
> > v2.6.30-rc1-1002-gac91f91, there were a couple of issues, the main
> > one is ilustrated bellow.
> > 
> > I am not familiar with the kernel code, but if you give me some
> > pointers, I will be glad to investigate this further
> > 
> > $time cat /sys/class/thermal/thermal_zone0/temp 
> > 34000
> > 
> > real	0m6.613s
> > user	0m0.000s
> > sys	0m0.001s
> > 
> 
> Is this a regression?  Was 2.6.29 OK?
> 
> Thanks.

My last kernel was fine:

$ time cat /sys/class/thermal/thermal_zone0/temp 
48000

real	0m0.007s
user	0m0.001s
sys	0m0.007s


I also forgot to add some information about my kernels...

The good one is 2.6.29 + tuxonice as it was the day after the 2.6.29
kernel was released.

The bad one is a pull from linus tree on april the 9th plus tuxonice on
the same day

from git (hope this helps):
$ git describe v2.6.29-tiago2-ice
v2.6.29-836-g00492ed
$ git describe v2.6.30-rc1-tiago1-ice
v2.6.30-rc1-1002-gac91f91


If tuxonice is a suspect, I will be glad to remove it and recompile.
If I have the time later this weekend, and nothing was found, I will
try to bisect this.

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