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

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Date:	Thu, 23 Feb 2012 18:03:56 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Rafael Aquini <aquini@...hat.com>
Cc:	David Rientjes <rientjes@...gle.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, 2012-02-23 at 13:22 -0200, Rafael Aquini wrote:
> > I think this also gives another usecase for a possible /dev/mem_notify in 
> > the future: userspace could easily poll on an eventfd and wait for an oom 
> > to occur and then cat /proc/slabinfo to attain all this.  In other words, 
> > if we had this functionality (which I think we undoubtedly will in the 
> > future), this patch would be obsoleted.
> 
> 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.

Sure.

I'm not really convinced such an ABI would be a full replacement for
this patch. There's certainly advantages to having all this visible in
syslog even if we'd have such a mechanism.

			Pekka

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