On Thu, Oct 01, 2009 at 09:56:04PM +0200, Rafael J. Wysocki wrote: > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=14265 > Subject : ifconfig: page allocation failure. order:5, mode:0x8020 w/ e100 > Submitter : Karol Lewandowski <karol.k.lewandowski@xxxxxxxxx> > Date : 2009-09-15 12:05 (17 days old) > References : http://marc.info/?l=linux-kernel&m=125301636509517&w=4 Guys, could anyone check if patch below helps? I think I've finally found culprit of all allocation failures (but I might be wrong too... ;-) Thanks. commit d6849591e042bceb66f1b4513a1df6740d2ad762 Author: Karol Lewandowski <karol.k.lewandowski@xxxxxxxxx> Date: Wed Oct 21 21:01:20 2009 +0200 SLUB: Don't drop __GFP_NOFAIL completely from allocate_slab() Commit ba52270d18fb17ce2cf176b35419dab1e43fe4a3 unconditionally cleared __GFP_NOFAIL flag on all allocations. Preserve this flag on second attempt to allocate page (with possibly decreased order). This should help with bugs #14265, #14141 and similar. Signed-off-by: Karol Lewandowski <karol.k.lewandowski@xxxxxxxxx> diff --git a/mm/slub.c b/mm/slub.c index b627675..ac5db65 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -1084,7 +1084,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) { struct page *page; struct kmem_cache_order_objects oo = s->oo; - gfp_t alloc_gfp; + gfp_t alloc_gfp, nofail; flags |= s->allocflags; @@ -1092,6 +1092,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) * Let the initial higher-order allocation fail under memory pressure * so we fall-back to the minimum order allocation. */ + nofail = flags & __GFP_NOFAIL; alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL; page = alloc_slab_page(alloc_gfp, node, oo); @@ -1100,8 +1101,10 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) /* * Allocation may have failed due to fragmentation. * Try a lower order alloc if possible + * + * Preserve __GFP_NOFAIL flag if previous allocation failed. */ - page = alloc_slab_page(flags, node, oo); + page = alloc_slab_page(flags | nofail, node, oo); if (!page) return NULL; -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
