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block: allocate request memory local to request queue

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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 <tj@kernel.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
David Rientjes 2015-03-24 16:21:16 -07:00 committed by Jens Axboe
parent bfd343aa17
commit 271508dba2
1 changed files with 16 additions and 3 deletions
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19
block/blk-core.c
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@ -557,6 +557,18 @@ void blk_cleanup_queue(struct request_queue *q)
}
EXPORT_SYMBOL(blk_cleanup_queue);
/* 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,
init_waitqueue_head(&rl->wait[BLK_RW_SYNC]);
init_waitqueue_head(&rl->wait[BLK_RW_ASYNC]);
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;