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rbd: allocate object requests with a slab allocator

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Create a slab cache to manage rbd_obj_request allocation.  We aren't
using a constructor, and we'll zero-fill object request structures
when they're allocated.

This is part of:
    http://tracker.ceph.com/issues/3926

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-05-01 12:43:03 -05:00
parent f907ad5596
commit 868311b1eb
1 changed files with 20 additions and 3 deletions
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23
drivers/block/rbd.c
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@ -346,6 +346,7 @@ static LIST_HEAD(rbd_client_list); /* clients */
static DEFINE_SPINLOCK(rbd_client_list_lock);
static struct kmem_cache *rbd_img_request_cache;
static struct kmem_cache *rbd_obj_request_cache;
static int rbd_img_request_submit(struct rbd_img_request *img_request);
@ -1762,7 +1763,7 @@ static struct rbd_obj_request *rbd_obj_request_create(const char *object_name,
if (!name)
return NULL;
obj_request = kzalloc(sizeof (*obj_request), GFP_KERNEL);
obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_KERNEL);
if (!obj_request) {
kfree(name);
return NULL;
@ -1814,7 +1815,8 @@ static void rbd_obj_request_destroy(struct kref *kref)
}
kfree(obj_request->object_name);
kfree(obj_request);
obj_request->object_name = NULL;
kmem_cache_free(rbd_obj_request_cache, obj_request);
}
/*
@ -5008,14 +5010,29 @@ static int rbd_slab_init(void)
sizeof (struct rbd_img_request),
__alignof__(struct rbd_img_request),
0, NULL);
if (rbd_img_request_cache)
if (!rbd_img_request_cache)
return -ENOMEM;
rbd_assert(!rbd_obj_request_cache);
rbd_obj_request_cache = kmem_cache_create("rbd_obj_request",
sizeof (struct rbd_obj_request),
__alignof__(struct rbd_obj_request),
0, NULL);
if (rbd_obj_request_cache)
return 0;
kmem_cache_destroy(rbd_img_request_cache);
rbd_img_request_cache = NULL;
return -ENOMEM;
}
static void rbd_slab_exit(void)
{
rbd_assert(rbd_obj_request_cache);
kmem_cache_destroy(rbd_obj_request_cache);
rbd_obj_request_cache = NULL;
rbd_assert(rbd_img_request_cache);
kmem_cache_destroy(rbd_img_request_cache);
rbd_img_request_cache = NULL;