linux-kernel - Re: [bug] shrink_slab shrinkersize handling

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Message-Id: <20120516145303.8a9cb329.akpm@linux-foundation.org>
Date:	Wed, 16 May 2012 14:53:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	solmac john <johnsolmac@...il.com>
Cc:	Dave Chinner <david@...morbit.com>, linux-mm <linux-mm@...ck.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kernelnewbies@...nelnewbies.org, linux-kernel@...r.kernel.org,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Subject: Re: [bug] shrink_slab shrinkersize handling

On Wed, 16 May 2012 14:33:18 +0530
solmac john <johnsolmac@...il.com> wrote:

> Hi All,
> 
> During mm performance testing sometimes I observed below kernel messages
> 
> [   80.776000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2133936901
> [   80.784000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2139256767
> [   80.796000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2079333971
> [   80.804000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-2096156269
> [   80.812000] shrink_slab: ashmem_shrink+0x0/0x114 negative objects to
> delete nr=-20658392
> 
> ...
>
> I found one patch  http://lkml.org/lkml/2011/8/22/80    for this fix
> Please let me know reason why I am getting above error and above is really
> fix for this problem.  ?

Yes, that patch should fix it.

Aside: I spent some time trying to work out the reason why local
variable `max_pass' in shrink_slab() is called `max_pass' and failed.


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