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Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c94
1 files changed, 86 insertions, 8 deletions
diff --git a/mm/slab.c b/mm/slab.c
index d3608d15fbe4..85e394f5918c 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -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:
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 14:40:45 +0000