Re: [patch resend 1/3] block: allocate request memory local to request queue
On 03/24/2015 05:21 PM, David Rientjes wrote: 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. Applied to for-4.1/core, thanks. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[patch resend 1/3] 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
---
block/blk-core.c | 19 ---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -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(>wait[BLK_RW_SYNC]);
init_waitqueue_head(>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;
--
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[patch resend 1/3] 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 t...@kernel.org
Signed-off-by: David Rientjes rient...@google.com
---
block/blk-core.c | 19 ---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -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;
--
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the body of a message to majord...@vger.kernel.org
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Please read the FAQ at http://www.tux.org/lkml/
Re: [patch resend 1/3] block: allocate request memory local to request queue
On 03/24/2015 05:21 PM, David Rientjes wrote: 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. Applied to for-4.1/core, thanks. -- Jens Axboe -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
