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

[Pekka J Enberg]

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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