From: Andrew Morton <akpm@digeo.com>
To: Dave Hansen <haveblue@us.ibm.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
"Martin J. Bligh" <mbligh@aracnet.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu, rml@tech9.net,
riel@surriel.com, Davide Libenzi <davidel@xmailserver.org>
Subject: Re: unusual scheduling performance
Date: Mon, 18 Nov 2002 15:09:42 -0800 [thread overview]
Message-ID: <3DD97336.40326A65@digeo.com> (raw)
In-Reply-To: 3DD96EE6.1080603@us.ibm.com
Dave Hansen wrote:
>
> As Andrew suggested, I put a dump_stack() in rwsem_down_write_failed().
>
> This was actually in a 2.5.47 bk snapshot, so it has eventpoll in it.
So printk("hey!\n") would have worked. Looks like it would have
talked to you, too...
> kksymoops is broken, so:
> dmesg | tail -20 | sort | uniq | ksymoops -m /boot/System.map
>
> Trace; c01c5757 <rwsem_down_write_failed+27/170>
> Trace; c01220c6 <update_wall_time+16/50>
> Trace; c01223ee <do_timer+2e/c0>
> Trace; c0166bd3 <.text.lock.eventpoll+6/f3>
> Trace; c0146568 <__fput+18/c0>
> Trace; c010ae9a <handle_IRQ_event+2a/60>
> Trace; c0144a05 <filp_close+85/b0>
> Trace; c0144a8d <sys_close+5d/70>
> Trace; c0108fab <syscall_call+7/b>
>
So it would appear that eventpoll_release() is the problem.
How odd. You're not actually _using_ epoll there, are you?
next prev parent reply other threads:[~2002-11-18 23:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-18 8:18 unusual scheduling performance William Lee Irwin III
2002-11-18 16:34 ` Martin J. Bligh
2002-11-18 16:53 ` William Lee Irwin III
2002-11-18 17:53 ` Dave Hansen
2002-11-18 18:16 ` Andrew Morton
2002-11-18 18:34 ` Davide Libenzi
2002-11-18 18:52 ` Andrew Morton
2002-11-18 18:58 ` Davide Libenzi
2002-11-18 18:56 ` Dave Hansen
2002-11-18 18:59 ` Davide Libenzi
2002-11-18 20:17 ` William Lee Irwin III
2002-11-18 22:51 ` Dave Hansen
2002-11-18 23:09 ` Andrew Morton [this message]
2002-11-18 23:20 ` Davide Libenzi
2002-11-18 23:26 ` Dave Hansen
2002-11-18 23:30 ` Davide Libenzi
2002-11-18 23:33 ` Davide Libenzi
2002-11-20 14:12 ` Ingo Molnar
2002-11-20 22:19 ` William Lee Irwin III
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