linux-kernel - Re: [PATCH 1/2] slub: fix leakage

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Message-ID: <Pine.LNX.4.64.0711060738100.30188@blonde.wat.veritas.com>
Date:	Tue, 6 Nov 2007 07:58:40 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
cc:	Christoph Lameter <clameter@....com>,
	Olivér Pintér <oliver.pntr@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Willy Tarreau <w@....eu>, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH 1/2] slub: fix leakage

On Tue, 6 Nov 2007, Jeff Chua wrote:
> On Nov 6, 2007 2:45 AM, Christoph Lameter <clameter@....com> wrote:
> 
> > 1. We can avoid going back to the page allocator for awhile since we will
> > find the almost free slab if the current slab is exhausted.
> 
> Does this impact SLAB as well?

No, it's in code peculiar to SLUB.

Of course, there might be a similar bug somewhere in SLAB.
More likely to be something else though.

> I'm getting out of memory with kernel
> 2.6.21, 2.6.22 and 2.6.23, so I'm stuck with 2.6.20-15 for systems
> running Oracle. It only happens with lots of activities.

It would help everybody if you could get more info on this.
Give 2.6.24-rc2 a try when it appears, if you can.

Do you think it's the SLAB which is growing?  If /proc/meminfo's
Slab count goes up and up, then use /proc/slabinfo to see what
it is that's leaking.  Then there's CONFIG_DEBUG_SLAB_LEAK.

With 2.6.22 or 2.6.23 you could CONFIG_SLUB instead, apply
the leak fix from this thread, and see if SLUB behaves the same
(using Documentation/vm/slabinfo.c instead of /proc/slabinfo); but
chances are the problem's above it, and it will behave the same.

Best start a new thread when you can report back.

Thanks,
Hugh
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