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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2016-05-19 17:10:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 19:12:14 -0700
commit213b46958c65c7adaaf3201102da16ce0264e9cf (patch)
tree0f1a9a7bf4a6501b7a4e3016758c5b227651c03e
parent76b342bdc71badea2cbac7bf6590aa86e895c507 (diff)
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mm/slab: refill cpu cache through a new slab without holding a node lock
Until now, cache growing makes a free slab on node's slab list and then we can allocate free objects from it. This necessarily requires to hold a node lock which is very contended. If we refill cpu cache before attaching it to node's slab list, we can avoid holding a node lock as much as possible because this newly allocated slab is only visible to the current task. This will reduce lock contention. Below is the result of concurrent allocation/free in slab allocation benchmark made by Christoph a long time ago. I make the output simpler. The number shows cycle count during alloc/free respectively so less is better. * Before Kmalloc N*alloc N*free(32): Average=355/750 Kmalloc N*alloc N*free(64): Average=452/812 Kmalloc N*alloc N*free(128): Average=559/1070 Kmalloc N*alloc N*free(256): Average=1176/980 Kmalloc N*alloc N*free(512): Average=1939/1189 Kmalloc N*alloc N*free(1024): Average=3521/1278 Kmalloc N*alloc N*free(2048): Average=7152/1838 Kmalloc N*alloc N*free(4096): Average=13438/2013 * After Kmalloc N*alloc N*free(32): Average=248/966 Kmalloc N*alloc N*free(64): Average=261/949 Kmalloc N*alloc N*free(128): Average=314/1016 Kmalloc N*alloc N*free(256): Average=741/1061 Kmalloc N*alloc N*free(512): Average=1246/1152 Kmalloc N*alloc N*free(1024): Average=2437/1259 Kmalloc N*alloc N*free(2048): Average=4980/1800 Kmalloc N*alloc N*free(4096): Average=9000/2078 It shows that contention is reduced for all the object sizes and performance increases by 30 ~ 40%. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab.c68
1 files changed, 36 insertions, 32 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 8c4db214b05b..37600e91742f 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2865,6 +2865,30 @@ static noinline void *cache_alloc_pfmemalloc(struct kmem_cache *cachep,
return obj;
}
+/*
+ * Slab list should be fixed up by fixup_slab_list() for existing slab
+ * or cache_grow_end() for new slab
+ */
+static __always_inline int alloc_block(struct kmem_cache *cachep,
+ struct array_cache *ac, struct page *page, int batchcount)
+{
+ /*
+ * There must be at least one object available for
+ * allocation.
+ */
+ BUG_ON(page->active >= cachep->num);
+
+ while (page->active < cachep->num && batchcount--) {
+ STATS_INC_ALLOCED(cachep);
+ STATS_INC_ACTIVE(cachep);
+ STATS_SET_HIGH(cachep);
+
+ ac->entry[ac->avail++] = slab_get_obj(cachep, page);
+ }
+
+ return batchcount;
+}
+
static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
{
int batchcount;
@@ -2877,7 +2901,6 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
check_irq_off();
node = numa_mem_id();
-retry:
ac = cpu_cache_get(cachep);
batchcount = ac->batchcount;
if (!ac->touched && batchcount > BATCHREFILL_LIMIT) {
@@ -2907,21 +2930,7 @@ retry:
check_spinlock_acquired(cachep);
- /*
- * The slab was either on partial or free list so
- * there must be at least one object available for
- * allocation.
- */
- BUG_ON(page->active >= cachep->num);
-
- while (page->active < cachep->num && batchcount--) {
- STATS_INC_ALLOCED(cachep);
- STATS_INC_ACTIVE(cachep);
- STATS_SET_HIGH(cachep);
-
- ac->entry[ac->avail++] = slab_get_obj(cachep, page);
- }
-
+ batchcount = alloc_block(cachep, ac, page, batchcount);
fixup_slab_list(cachep, n, page, &list);
}
@@ -2941,21 +2950,18 @@ alloc_done:
}
page = cache_grow_begin(cachep, gfp_exact_node(flags), node);
- cache_grow_end(cachep, page);
/*
* cache_grow_begin() can reenable interrupts,
* then ac could change.
*/
ac = cpu_cache_get(cachep);
- node = numa_mem_id();
+ if (!ac->avail && page)
+ alloc_block(cachep, ac, page, batchcount);
+ cache_grow_end(cachep, page);
- /* no objects in sight? abort */
- if (!page && ac->avail == 0)
+ if (!ac->avail)
return NULL;
-
- if (!ac->avail) /* objects refilled by interrupt? */
- goto retry;
}
ac->touched = 1;
@@ -3149,14 +3155,13 @@ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
{
struct page *page;
struct kmem_cache_node *n;
- void *obj;
+ void *obj = NULL;
void *list = NULL;
VM_BUG_ON(nodeid < 0 || nodeid >= MAX_NUMNODES);
n = get_node(cachep, nodeid);
BUG_ON(!n);
-retry:
check_irq_off();
spin_lock(&n->list_lock);
page = get_first_slab(n, false);
@@ -3178,19 +3183,18 @@ retry:
spin_unlock(&n->list_lock);
fixup_objfreelist_debug(cachep, &list);
- goto done;
+ return obj;
must_grow:
spin_unlock(&n->list_lock);
page = cache_grow_begin(cachep, gfp_exact_node(flags), nodeid);
+ if (page) {
+ /* This slab isn't counted yet so don't update free_objects */
+ obj = slab_get_obj(cachep, page);
+ }
cache_grow_end(cachep, page);
- if (page)
- goto retry;
- return fallback_alloc(cachep, flags);
-
-done:
- return obj;
+ return obj ? obj : fallback_alloc(cachep, flags);
}
static __always_inline void *