linux-kernel - Re: [PATCH] oom: add sysctl to enable slab memory dump

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Message-ID: <alpine.LFD.2.02.1202240856370.1917@tux.localdomain>
Date:	Fri, 24 Feb 2012 08:57:37 +0200 (EET)
From:	Pekka Enberg <penberg@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
cc:	Rafael Aquini <aquini@...hat.com>, linux-mm@...ck.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>, Rik van Riel <riel@...hat.com>,
	Josef Bacik <josef@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] oom: add sysctl to enable slab memory dump

On Thu, 23 Feb 2012, David Rientjes wrote:
> > Great! So, why not letting the time tell us if this feature will be obsoleted
> > or not? I'd rather have this patch obsoleted by another one proven better, than
> > just stay still waiting for something that might, or might not, happen in the
> > future.
> 
> Because (1) you're adding a sysctl that we don't want to obsolete and 
> remove from the kernel that someone will come to depend on and then have 
> to find an alternative solution like /dev/mem_notify, and (2) people parse 
> messages like this that are emitted to the kernel log that we don't want 
> to break in the future.
> 
> So NACK on this approach.

Right. We should drop the sysctl and make it into a kernel command line 
debugging option instead.

			Pekka
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