linux-kernel - Re: [patch] CFS scheduler, -v19

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Message-ID: <20070717170628.GA6002@elte.hu>
Date:	Tue, 17 Jul 2007 19:06:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Markus <lists4me@....de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [patch] CFS scheduler, -v19


* Markus <lists4me@....de> wrote:

> > > Nothing is printed for a disapeared app for me.
> > > 
> > > Is there anything more I can try?
> > 
> > sure - could you start one of those apps via:
> > 
> > 	strace -ttt -TTT -o trace.log -f <app>
> > 
> > and wait for it to "disappear"? Then compress the trace.log via 
> > bzip2 -9 (it's probably going to be a really large file) and send me 
> > it?
> private mail, aswell (187K)

i think it fails here due to some IO error:

 9173  1184675906.674610 write(2, "konqueror: Fatal IO error: clien"..., 41) = 41 <0.000007>

could this be due to:

9173  1184675906.194424 ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff341af5c0)
= -1 ENOTTY (Inappropriate ioctl for device) <0.000006>
9173  1184675906.194463 ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, 0x7fff341af5c0)
= -1 ENOTTY (Inappropriate ioctl for device) <0.000004>

? Are those -ENOTTY results normal?

or perhaps the problem started alot earlier, at:

9173  1184675906.155015 write(2, "In file kernel/qpixmap_x11.cpp, "..., 56) = 56 <0.000006>
9173  1184675906.155052 write(2, "QImage::convertDepth: Image is a"..., 44) = 44 <0.000004>
9173  1184675906.155169 gettimeofday({1184675906, 155179}, NULL) = 0 <0.000006>
9173  1184675906.155249 write(11, "close(6f1c2f7):about:konqueror\n", 31) = 31 <0.000032>

i think konqueror tried to say something here about an image problem?

could you perhaps upload the strace to some webpage so that others can 
take a look too?

it might also be good to add "-s 1000" to the strace command, so that we 
can see the full messages that konqueror tried to log to some other 
task, i.e.:

  strace -s 1000 -ttt -TTT -o trace.log -f <app>

and perhaps try to do a 'comparison' trace.normal.log as well, with 
konqueror having no problems. Also a KDE expert's advice would be useful 
here too i guess ...

	Ingo
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