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From: Bradley Chapman <kakadu_croc@yahoo.com>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: What exactly are the issues with 2.6.0-test10 preempt?
Date: Mon, 24 Nov 2003 13:55:17 -0800 (PST)	[thread overview]
Message-ID: <20031124215517.3538.qmail@web40904.mail.yahoo.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0311242240410.2874-100000@poirot.grange>

Mr. Liakhovetski,

--- Guennadi Liakhovetski <g.liakhovetski@gmx.de> wrote:
> On Mon, 24 Nov 2003, Bradley Chapman wrote:
> 
> > Hmmm. This is what I have enabled under "Kernel hacking":
> >
> > #
> > # Kernel hacking
> > #
> > CONFIG_DEBUG_KERNEL=y
> > CONFIG_DEBUG_STACKOVERFLOW=y
> > CONFIG_DEBUG_SLAB=y
> > CONFIG_DEBUG_IOVIRT=y
> > CONFIG_MAGIC_SYSRQ=y
> > CONFIG_DEBUG_SPINLOCK=y
> > # CONFIG_DEBUG_PAGEALLOC is not set
>     ^^^^^^^^^^^^^^^^^^^^^^
> 
> Here's a candidate. I did have it on. Yes, I know it causes a slowdown -
> that was for testing. I could try to double check, if disabling that
> single option fixes the problem - but for that I'd need to recompile and
> re-install kernel and modules... I also didn't have
> CONFIG_DEBUG_STACKOVERFLOW switched on - but I don't think that could be
> the reason.

I've never enabled CONFIG_DEBUG_PAGEALLOC - the slowdown bit in the help text
never gave me a warm&fuzzy. If CONFIG_PREEMPT=y && CONFIG_DEBUG_PAGEALLOC=y,
perhaps the pagealloc debug code is exposing a messed-up preempt somewhere near
a memory allocation (IANAKC).

I found the thread regarding slab Oopsen where Linus mentioned CONFIG_PREEMPT
as a possiblity, but I'm not experiencing any issues with -test10 or -test9-bk22.
So I don't think the bug in that thread is affecting me at all, if it hasn't been
fixed.

> 
> > # CONFIG_DEBUG_INFO is not set
> > CONFIG_DEBUG_SPINLOCK_SLEEP=y
> > # CONFIG_FRAME_POINTER is not set
> > CONFIG_X86_EXTRA_IRQS=y
> > CONFIG_X86_FIND_SMP_CONFIG=y
> > CONFIG_X86_MPPARSE=y
> >
> > So far, though, not a single problem -- I was playing Flash animations while
> > printing a huge document without a single hiccup (I have an HP DeskJet 880C with
> > very little memory, so there was a lot of in-kernel activity).
> 
> Guennadi

Brad


=====


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  reply	other threads:[~2003-11-24 21:55 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-24 19:14 What exactly are the issues with 2.6.0-test10 preempt? Bradley Chapman
2003-11-24 21:08 ` Guennadi Liakhovetski
2003-11-24 21:29   ` Bradley Chapman
2003-11-24 21:47     ` Guennadi Liakhovetski
2003-11-24 21:55       ` Bradley Chapman [this message]
2003-11-24 21:59   ` Linus Torvalds
2003-11-24 22:26     ` Bradley Chapman
2003-11-24 22:32       ` Linus Torvalds
2003-11-24 22:45         ` Bradley Chapman
2003-11-24 23:00           ` Linus Torvalds
2003-11-24 23:45             ` Linus Torvalds
2003-11-25  7:55         ` Jos Hulzink
2003-11-24 22:41       ` Måns Rullgård
2003-11-24 22:51         ` Mike Fedyk
2003-11-25  1:37           ` Måns Rullgård
2003-11-25 17:22           ` bill davidsen
2003-11-24 22:57     ` Guennadi Liakhovetski
2003-11-25  7:17     ` Guennadi Liakhovetski
2003-11-25 16:20       ` Linus Torvalds
2003-11-30  9:09 ` Matthias Urlichs
     [not found] <20031124224514.56242.qmail@web40908.mail.yahoo.com.suse.lists.linux.kernel>
     [not found] ` <Pine.LNX.4.58.0311241452550.15101@home.osdl.org.suse.lists.linux.kernel>
2003-11-24 23:50   ` Andi Kleen
2003-11-25  0:00     ` Mike Fedyk
2003-11-25  0:05       ` Andi Kleen
2003-11-25  0:16         ` Chris Mason
2003-11-25 18:13 kernel
2003-11-25 18:14 root
2003-11-25 18:31 kernel
2003-11-26  9:30 ` Jens Axboe

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