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

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Message-ID: <CAOJsxLHEAZbN-sPeJ10qAN-HVEj0Rq_RkLt0QCvZHhZitW+9pw@mail.gmail.com>
Date:	Fri, 24 Feb 2012 23:52:38 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Josef Bacik <josef@...hat.com>, 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>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] oom: add sysctl to enable slab memory dump

On Fri, 24 Feb 2012, Josef Bacik wrote:
>> Um well yeah, I'm rewriting a chunk of btrfs which was rapantly leaking memory
>> so the OOM just couldn't keep up with how much I was sucking down.  This is
>> strictly a developer is doing something stupid and needs help pointing out what
>> it is sort of moment, not a day to day OOM.

On Fri, Feb 24, 2012 at 11:45 PM, David Rientjes <rientjes@...gle.com> wrote:
> If you're debugging new kernel code and you realize that excessive amount
> of memory is being consumed so that nothing can even fork, you may want to
> try cat /proc/slabinfo before you get into that condition the next time
> around, although I already suspect that you know the cache you're leaking.
> It doesn't mean we need to add hundreds of lines of code to the kernel.
> Try kmemleak.

Kmemleak is a wonderful tool but it's also pretty heavy-weight which
makes it inconvenient in many cases.

                                Pekka
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