path: root/block/blk-core.c
diff options
authorDavid Rientjes <>2015-03-24 16:21:16 -0700
committerJens Axboe <>2015-03-24 20:00:07 -0600
commit271508dba2c3fc307e7c44e2731a2ece70a4025e (patch)
tree490ba0bdb3ab6d72974ed73c8adcdc3ce0b12329 /block/blk-core.c
parentbfd343aa1718457d34b99ce6573085ac340da288 (diff)
block: allocate request memory local to request queue
blk_init_rl() allocates a mempool using mempool_create_node() with node local memory. This only allocates the mempool and element list locally to the requeue queue node. What we really want to do is allocate the request itself local to the queue. To do this, we need our own alloc and free functions that will allocate from request_cachep and pass the request queue node in to prefer node local memory. Acked-by: Tejun Heo <> Signed-off-by: David Rientjes <> Signed-off-by: Jens Axboe <>
Diffstat (limited to 'block/blk-core.c')
1 files changed, 16 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 794c3e7f01cf..fd154b94447a 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -557,6 +557,18 @@ void blk_cleanup_queue(struct request_queue *q)
+/* Allocate memory local to the request queue */
+static void *alloc_request_struct(gfp_t gfp_mask, void *data)
+ int nid = (int)(long)data;
+ return kmem_cache_alloc_node(request_cachep, gfp_mask, nid);
+static void free_request_struct(void *element, void *unused)
+ kmem_cache_free(request_cachep, element);
int blk_init_rl(struct request_list *rl, struct request_queue *q,
gfp_t gfp_mask)
@@ -569,9 +581,10 @@ int blk_init_rl(struct request_list *rl, struct request_queue *q,
- rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, mempool_alloc_slab,
- mempool_free_slab, request_cachep,
- gfp_mask, q->node);
+ rl->rq_pool = mempool_create_node(BLKDEV_MIN_RQ, alloc_request_struct,
+ free_request_struct,
+ (void *)(long)q->node, gfp_mask,
+ q->node);
if (!rl->rq_pool)
return -ENOMEM;