linux-kernel - Re: [Bug #13319] Page allocation failures with b43 and p54usb

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Message-ID: <Pine.LNX.4.64.0906081657001.7036@melkki.cs.Helsinki.FI>
Date:	Mon, 8 Jun 2009 16:58:10 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
cc:	Rik van Riel <riel@...hat.com>,
	Larry Finger <Larry.Finger@...inger.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Johannes Berg <johannes@...solutions.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [Bug #13319] Page allocation failures with b43 and p54usb

Hi Mel,

On Mon, 8 Jun 2009, Mel Gorman wrote:
> Is there any chance you could hatchet together a patch
> slab-allocation-failure that reports on slab allocation failures similar
> to what the page allocator does? Minimally, it should tell us what
> the size of the allocation was but any other information such as the
> same of the slab, the size of pages it normally uses are, etc. would
> also be useful.

Would something like this be sufficient? Figuring out the actual _size_ 
passed to kmalloc() is pretty difficult as then we would need to do the 
NULL test in fastpath code or pass the argument deeper in the call-chain.

			Pekka

diff --git a/mm/slub.c b/mm/slub.c
index 65ffda5..b5acf18 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1565,6 +1565,8 @@ new_slab:
 		c->page = new;
 		goto load_freelist;
 	}
+	printk(KERN_WARNING "SLUB: unable to satisfy allocation for cache %s (size=%d, node=%d, gfp=%x)\n",
+		s->name, s->size, node, gfpflags);
 	return NULL;
 debug:
 	if (!alloc_debug_processing(s, c->page, object, addr))
--
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