diff options
| -rw-r--r-- | mm/slab.c | 94 |
1 files changed, 86 insertions, 8 deletions
@@ -270,7 +270,9 @@ static void kmem_cache_node_init(struct kmem_cache_node *parent) MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ } while (0) +#define CFLGS_OBJFREELIST_SLAB (0x40000000UL) #define CFLGS_OFF_SLAB (0x80000000UL) +#define OBJFREELIST_SLAB(x) ((x)->flags & CFLGS_OBJFREELIST_SLAB) #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) #define BATCHREFILL_LIMIT 16 @@ -480,7 +482,7 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size, * the slabs are all pages aligned, the objects will be at the * correct alignment when allocated. */ - if (flags & CFLGS_OFF_SLAB) { + if (flags & (CFLGS_OBJFREELIST_SLAB | CFLGS_OFF_SLAB)) { *num = slab_size / buffer_size; *left_over = slab_size % buffer_size; } else { @@ -1801,6 +1803,12 @@ static void slab_destroy_debugcheck(struct kmem_cache *cachep, struct page *page) { int i; + + if (OBJFREELIST_SLAB(cachep) && cachep->flags & SLAB_POISON) { + poison_obj(cachep, page->freelist - obj_offset(cachep), + POISON_FREE); + } + for (i = 0; i < cachep->num; i++) { void *objp = index_to_obj(cachep, page, i); @@ -2029,6 +2037,29 @@ __kmem_cache_alias(const char *name, size_t size, size_t align, return cachep; } +static bool set_objfreelist_slab_cache(struct kmem_cache *cachep, + size_t size, unsigned long flags) +{ + size_t left; + + cachep->num = 0; + + if (cachep->ctor || flags & SLAB_DESTROY_BY_RCU) + return false; + + left = calculate_slab_order(cachep, size, + flags | CFLGS_OBJFREELIST_SLAB); + if (!cachep->num) + return false; + + if (cachep->num * sizeof(freelist_idx_t) > cachep->object_size) + return false; + + cachep->colour = left / cachep->colour_off; + + return true; +} + static bool set_off_slab_cache(struct kmem_cache *cachep, size_t size, unsigned long flags) { @@ -2217,6 +2248,11 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) } #endif + if (set_objfreelist_slab_cache(cachep, size, flags)) { + flags |= CFLGS_OBJFREELIST_SLAB; + goto done; + } + if (set_off_slab_cache(cachep, size, flags)) { flags |= CFLGS_OFF_SLAB; goto done; @@ -2434,7 +2470,9 @@ static void *alloc_slabmgmt(struct kmem_cache *cachep, page->s_mem = addr + colour_off; page->active = 0; - if (OFF_SLAB(cachep)) { + if (OBJFREELIST_SLAB(cachep)) + freelist = NULL; + else if (OFF_SLAB(cachep)) { /* Slab management obj is off-slab. */ freelist = kmem_cache_alloc_node(cachep->freelist_cache, local_flags, nodeid); @@ -2507,6 +2545,11 @@ static void cache_init_objs(struct kmem_cache *cachep, cache_init_objs_debug(cachep, page); + if (OBJFREELIST_SLAB(cachep)) { + page->freelist = index_to_obj(cachep, page, cachep->num - 1) + + obj_offset(cachep); + } + for (i = 0; i < cachep->num; i++) { /* constructor could break poison info */ if (DEBUG == 0 && cachep->ctor) @@ -2558,6 +2601,9 @@ static void slab_put_obj(struct kmem_cache *cachep, } #endif page->active--; + if (!page->freelist) + page->freelist = objp + obj_offset(cachep); + set_free_obj(page, page->active, objnr); } @@ -2632,7 +2678,7 @@ static int cache_grow(struct kmem_cache *cachep, /* Get slab management. */ freelist = alloc_slabmgmt(cachep, page, offset, local_flags & ~GFP_CONSTRAINT_MASK, nodeid); - if (!freelist) + if (OFF_SLAB(cachep) && !freelist) goto opps1; slab_map_pages(cachep, page, freelist); @@ -2735,14 +2781,42 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, #define cache_free_debugcheck(x,objp,z) (objp) #endif +static inline void fixup_objfreelist_debug(struct kmem_cache *cachep, + void **list) +{ +#if DEBUG + void *next = *list; + void *objp; + + while (next) { + objp = next - obj_offset(cachep); + next = *(void **)next; + poison_obj(cachep, objp, POISON_FREE); + } +#endif +} + static inline void fixup_slab_list(struct kmem_cache *cachep, - struct kmem_cache_node *n, struct page *page) + struct kmem_cache_node *n, struct page *page, + void **list) { /* move slabp to correct slabp list: */ list_del(&page->lru); - if (page->active == cachep->num) + if (page->active == cachep->num) { list_add(&page->lru, &n->slabs_full); - else + if (OBJFREELIST_SLAB(cachep)) { +#if DEBUG + /* Poisoning will be done without holding the lock */ + if (cachep->flags & SLAB_POISON) { + void **objp = page->freelist; + + *objp = *list; + *list = objp; + } +#endif + page->freelist = NULL; + } + } else list_add(&page->lru, &n->slabs_partial); } @@ -2768,6 +2842,7 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags, struct kmem_cache_node *n; struct array_cache *ac; int node; + void *list = NULL; check_irq_off(); node = numa_mem_id(); @@ -2819,13 +2894,14 @@ retry: ac_put_obj(cachep, ac, slab_get_obj(cachep, page)); } - fixup_slab_list(cachep, n, page); + fixup_slab_list(cachep, n, page, &list); } must_grow: n->free_objects -= ac->avail; alloc_done: spin_unlock(&n->list_lock); + fixup_objfreelist_debug(cachep, &list); if (unlikely(!ac->avail)) { int x; @@ -3062,6 +3138,7 @@ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, struct page *page; struct kmem_cache_node *n; void *obj; + void *list = NULL; int x; VM_BUG_ON(nodeid < 0 || nodeid >= MAX_NUMNODES); @@ -3086,9 +3163,10 @@ retry: obj = slab_get_obj(cachep, page); n->free_objects--; - fixup_slab_list(cachep, n, page); + fixup_slab_list(cachep, n, page, &list); spin_unlock(&n->list_lock); + fixup_objfreelist_debug(cachep, &list); goto done; must_grow: |
