linux-kernel - Re: suppress page allocation failure warnings from sys

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Message-ID: <20120329015059.GA22697@redhat.com>
Date:	Wed, 28 Mar 2012 21:50:59 -0400
From:	Dave Jones <davej@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joe Perches <joe@...ches.com>, Dave Chinner <david@...morbit.com>,
	viro@...iv.linux.org.uk,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: suppress page allocation failure warnings from sys_listxattr

On Wed, Mar 28, 2012 at 06:46:02PM -0700, Andrew Morton wrote:

 > Could.  There was some discussion last year and implementations were
 > tossed around.
 > 
 > I'm a bit apprehensive - kernel code is supposed to be robust, and
 > large allocations are not robust and vmalloc() is crappy.

Can you expand on crappy ?  Also, what happens if something allocates
and sits on a bunch of vmalloc'd memory ? would we start seeing oom kills ?
(thinking of the context of my fuzzing tool where a bunch of instances could
 feasibly call these syscalls and not sit on huge amounts per thread, but
 collectively...  I'm wondering if it could be provoked into killing
 processes I don't own)

	Dave

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