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

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Message-ID: <alpine.DEB.2.00.1202241342240.22880@chino.kir.corp.google.com>
Date:	Fri, 24 Feb 2012 13:45:32 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Josef Bacik <josef@...hat.com>
cc:	Rafael Aquini <aquini@...hat.com>, linux-mm@...ck.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.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.
>  

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.
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