linux-kernel - Re: [PATCH 18/24] sctp: Remove unnecessary OOM logging messages

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Date:	Wed, 31 Aug 2011 17:25:11 -0700
From:	Joe Perches <joe@...ches.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, vladislav.yasevich@...com, sri@...ibm.com,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 18/24] sctp: Remove unnecessary OOM logging messages

On Mon, 2011-08-29 at 18:15 -0400, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 29 Aug 2011 23:51:21 +0200
> > Le lundi 29 août 2011 à 23:43 +0200, Eric Dumazet a écrit :
> >> Furthermore, a failed vmalloc() is not guaranteed to emit an OOM
> >> message, is it ?
> > It currently displays a message without context :
> > vmap allocation for size XXXXXX failed: use vmalloc=<size> to increase
> > size.
> > So we dont know which part of the kernel asked this allocation.
> > Please dont remove existing error messages after failed vmalloc() calls.
> Indeed.
> Joe, these vmalloc() and also the __GFP_NOWARN cases will need to be
> attended to and this series resubmitted as such.

No worries.

Andrew Morton picked up a patch I posted that
changes vmalloc to be similar to kmalloc when
the pointer returned is NULL (OOM).  It now
uses dump_stack for those cases.

https://patchwork.kernel.org/patch/1114682/

I'll keep all the current vmalloc failure messages
for now and resubmit in a day or two this series
with acks.  Not batman or netfilter though as they
were picked up by their maintainers.

A month or two after the vmalloc patch hits
mainline and/or wider testing, and it's deemed
acceptable, removing vmalloc site specific OOM
messages should be appropriate.

Anyone object?

I plan on submitting drivers/net OOM removals
next week.

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