Disable slub debug facilities and allocate slabs at minimal order when corrupt_dbg > 0 to increase probability to catch random memory corruption by cpu exception. Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx> --- mm/slub.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 7d2a996..b0e4318 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2844,7 +2844,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) unsigned long flags = s->flags; unsigned long size = s->objsize; unsigned long align = s->align; - int order; + int order, min_order; /* * Round up object size to the next word boundary. We can only @@ -2929,8 +2929,11 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) */ size = ALIGN(size, align); s->size = size; + min_order = get_order(size); if (forced_order >= 0) order = forced_order; + else if (corrupt_dbg()) + order = min_order; else order = calculate_order(size, s->reserved); @@ -2951,7 +2954,7 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) * Determine the number of objects per slab */ s->oo = oo_make(order, size, s->reserved); - s->min = oo_make(get_order(size), size, s->reserved); + s->min = oo_make(min_order, size, s->reserved); if (oo_objects(s->oo) > oo_objects(s->max)) s->max = s->oo; @@ -3645,6 +3648,9 @@ void __init kmem_cache_init(void) struct kmem_cache *temp_kmem_cache_node; unsigned long kmalloc_size; + if (corrupt_dbg()) + slub_debug = 0; + kmem_size = offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *); -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>