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libceph: allocate ceph message data with a slab allocator

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Create a slab cache to manage ceph_msg_data structure allocation.

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 12:43:04 -05:00
parent e3d5d63804
commit 81b36be4c5
1 changed files with 23 additions and 3 deletions
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26
net/ceph/messenger.c
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@ -155,6 +155,7 @@ static bool con_flag_test_and_set(struct ceph_connection *con,
/* Slab caches for frequently-allocated structures */
static struct kmem_cache *ceph_msg_cache;
static struct kmem_cache *ceph_msg_data_cache;
/* static tag bytes (protocol control messages) */
static char tag_msg = CEPH_MSGR_TAG_MSG;
@ -236,11 +237,30 @@ static int ceph_msgr_slab_init(void)
ceph_msg_cache = kmem_cache_create("ceph_msg",
sizeof (struct ceph_msg),
__alignof__(struct ceph_msg), 0, NULL);
return ceph_msg_cache ? 0 : -ENOMEM;
if (!ceph_msg_cache)
return -ENOMEM;
BUG_ON(ceph_msg_data_cache);
ceph_msg_data_cache = kmem_cache_create("ceph_msg_data",
sizeof (struct ceph_msg_data),
__alignof__(struct ceph_msg_data),
0, NULL);
if (ceph_msg_data_cache)
return 0;
kmem_cache_destroy(ceph_msg_cache);
ceph_msg_cache = NULL;
return -ENOMEM;
}
static void ceph_msgr_slab_exit(void)
{
BUG_ON(!ceph_msg_data_cache);
kmem_cache_destroy(ceph_msg_data_cache);
ceph_msg_data_cache = NULL;
BUG_ON(!ceph_msg_cache);
kmem_cache_destroy(ceph_msg_cache);
ceph_msg_cache = NULL;
@ -3008,7 +3028,7 @@ static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
if (WARN_ON(!ceph_msg_data_type_valid(type)))
return NULL;
data = kzalloc(sizeof (*data), GFP_NOFS);
data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
if (data)
data->type = type;
INIT_LIST_HEAD(&data->links);
@ -3026,7 +3046,7 @@ static void ceph_msg_data_destroy(struct ceph_msg_data *data)
ceph_pagelist_release(data->pagelist);
kfree(data->pagelist);
}
kfree(data);
kmem_cache_free(ceph_msg_data_cache, data);
}
void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,