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Subject: Re: [patch v3] swap: virtual swap readahead
From: Peter Zijlstra <peterz@infradead.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Johannes Weiner <hannes@cmpxchg.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Rik van Riel <riel@redhat.com>,
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Date: Wed, 10 Jun 2009 11:42:56 +0200
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On Wed, 2009-06-10 at 16:56 +0800, Wu Fengguang wrote:
> 
> Yes it worked!  But then I run into page allocation failures:
> 
> [  340.639803] Xorg: page allocation failure. order:4, mode:0x40d0
> [  340.645744] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303
> [  340.651839] Call Trace:
> [  340.654289]  [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0
> [  340.660645]  [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0
> [  340.666472]  [<ffffffff810f8608>] __kmalloc+0x198/0x250
> [  340.671786]  [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915]
> [  340.678746]  [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915]

Jesse Barnes had a patch to add a vmalloc fallback to those largish kms
allocs.

But order-4 allocs failing isn't really strange, but it might indicate
this patch fragments stuff sooner, although I've seen these particular
failues before.
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