diff options
| -rw-r--r-- | mm/slub.c | 40 |
1 files changed, 19 insertions, 21 deletions
diff --git a/mm/slub.c b/mm/slub.c index 466089cd5de..a465c0a09fb 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -142,11 +142,11 @@ SLAB_POISON | SLAB_STORE_USER) /* - * Debugging flags that require metadata to be stored in the slab, up to - * DEBUG_SIZE in size. + * Debugging flags that require metadata to be stored in the slab. These get + * disabled when slub_debug=O is used and a cache's min order increases with + * metadata. */ -#define DEBUG_SIZE_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) -#define DEBUG_SIZE (3 * sizeof(void *) + 2 * sizeof(struct track)) +#define DEBUG_METADATA_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) /* * Set of flags that will prevent slab merging @@ -1040,27 +1040,13 @@ static unsigned long kmem_cache_flags(unsigned long objsize, unsigned long flags, const char *name, void (*ctor)(void *)) { - int debug_flags = slub_debug; - /* * Enable debugging if selected on the kernel commandline. */ - if (debug_flags) { - if (slub_debug_slabs && - strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs))) - goto out; - - /* - * Disable debugging that increases slab size if the minimum - * slab order would have increased as a result. - */ - if (disable_higher_order_debug && - get_order(objsize + DEBUG_SIZE) > get_order(objsize)) - debug_flags &= ~DEBUG_SIZE_FLAGS; + if (slub_debug && (!slub_debug_slabs || + !strncmp(slub_debug_slabs, name, strlen(slub_debug_slabs)))) + flags |= slub_debug; - flags |= debug_flags; - } -out: return flags; } #else @@ -2488,6 +2474,18 @@ static int kmem_cache_open(struct kmem_cache *s, gfp_t gfpflags, if (!calculate_sizes(s, -1)) goto error; + if (disable_higher_order_debug) { + /* + * Disable debugging flags that store metadata if the min slab + * order increased. + */ + if (get_order(s->size) > get_order(s->objsize)) { + s->flags &= ~DEBUG_METADATA_FLAGS; + s->offset = 0; + if (!calculate_sizes(s, -1)) + goto error; + } + } /* * The larger the object size is, the more pages we want on the partial |