linux-kernel - Re: + sys_getppid-oopses-on-debug-kernel.patch added to -mm tree

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Message-ID: <20060809173830.GA10930@redhat.com>
Date:	Wed, 9 Aug 2006 13:38:30 -0400
From:	Dave Jones <davej@...hat.com>
To:	Kirill Korotaev <dev@...ru>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	Björn Steinbrink <B.Steinbrink@....de>,
	linux-kernel@...r.kernel.org, dev@...nvz.org, stable@...nel.org
Subject: Re: + sys_getppid-oopses-on-debug-kernel.patch added to -mm tree

On Wed, Aug 09, 2006 at 12:12:49PM +0400, Kirill Korotaev wrote:
 > >  > >>Even without getting into just how ugly this is, is it really worth
 > >  > >>it?
 > >  > it is impossible to run debug kernels w/o this patch :/
 > >  > or are you asking whether this optimization worth it?
 > >  > 
 > >  > What makes me worry is that this is a sign that vendors
 > >  > don't even bother to run debug kernels :((((
 > > 
 > > Fedora rawhide is nearly always shipping with DEBUG_SLAB enabled,
 > > and we didn't hit this once.  Are you sure this is a problem
 > > with DEBUG_SLAB, and not DEBUG_PAGEALLOC ?
 > Sorry, it's my fault. Surely, CONFIG_DEBUG_PAGEALLOC.

Then you're correct, vendors rarely turn this on :)
I do sometimes if I'm trying to chase down something particularly
difficult, and it usually gets me a bunch of mail from users
asking why 'everything got all slow', so it's a last-resort option
rather than a 'on all the time' option.

		Dave

-- 
http://www.codemonkey.org.uk
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