On Wed, 2009-06-10 at 18:44 +0300, Pekka Enberg wrote: > Aha, SLUB thinks the minimum order for 4096 is 1. I guess you have > CONFIG_SLUB_DEBUG enabled? If yes, something like to following should > help. Christoph, are you okay with this patch? > > Pekka > > diff --git a/mm/slub.c b/mm/slub.c > index 65ffda5..2c93c30 100644 > --- a/mm/slub.c > +++ b/mm/slub.c > @@ -2334,6 +2334,8 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) > > } > > +#define MAX_DEBUG_SIZE (3 * sizeof(void *) + 2 * sizeof(struct track)) > + > static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags, > const char *name, size_t size, > size_t align, unsigned long flags, > @@ -2346,6 +2348,9 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags, > s->align = align; > s->flags = kmem_cache_flags(size, flags, name, ctor); > > + if ((size + MAX_DEBUG_SIZE) >= PAGE_SIZE) > + flags &= ~(SLAB_POISON|SLAB_RED_ZONE|SLAB_STORE_USER); > + > if (!calculate_sizes(s, -1)) > goto error; > > Argh, that patch has a typo. Please try this one instead. Pekka diff --git a/mm/slub.c b/mm/slub.c index 65ffda5..cb0473c 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2334,6 +2334,8 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) } +#define MAX_DEBUG_SIZE (3 * sizeof(void *) + 2 * sizeof(struct track)) + static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags, const char *name, size_t size, size_t align, unsigned long flags, @@ -2346,6 +2348,9 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags, s->align = align; s->flags = kmem_cache_flags(size, flags, name, ctor); + if ((size + MAX_DEBUG_SIZE) >= PAGE_SIZE) + s->flags &= ~(SLAB_POISON|SLAB_RED_ZONE|SLAB_STORE_USER); + if (!calculate_sizes(s, -1)) goto error; -- 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
