Re: unusual scheduling performance

From: Davide Libenzi (davidel@xmailserver.org)
Date: Mon Nov 18 2002 - 18:20:01 EST


On Mon, 18 Nov 2002, Andrew Morton wrote:

> 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?

Could you pls use 2.5.48 ...
This is wierd, the code is straight forward.

- Davide

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