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nfsd: create a dedicated slabcache for DRC entries

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Currently we use kmalloc() which wastes a little bit of memory on each
allocation since it's a power of 2 allocator. Since we're allocating a
1024 of these now, and may need even more later, let's create a new
slabcache for them.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2013-01-28 14:41:10 -05:00 committed by J. Bruce Fields
parent 09662d58d5
commit 8a8bc40d9b
1 changed files with 13 additions and 2 deletions
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15
fs/nfsd/nfscache.c
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@ -26,6 +26,7 @@
static struct hlist_head * cache_hash; static struct hlist_head * cache_hash;
static struct list_head lru_head; static struct list_head lru_head;
static int cache_disabled = 1; static int cache_disabled = 1;
static struct kmem_cache *drc_slab;
/* /*
* Calculate the hash index from an XID. * Calculate the hash index from an XID.
@ -51,10 +52,15 @@ int nfsd_reply_cache_init(void)
struct svc_cacherep *rp; struct svc_cacherep *rp;
int i; int i;
drc_slab = kmem_cache_create("nfsd_drc", sizeof(struct svc_cacherep),
0, 0, NULL);
if (!drc_slab)
goto out_nomem;
INIT_LIST_HEAD(&lru_head); INIT_LIST_HEAD(&lru_head);
i = CACHESIZE; i = CACHESIZE;
while (i) { while (i) {
rp = kmalloc(sizeof(*rp), GFP_KERNEL); rp = kmem_cache_alloc(drc_slab, GFP_KERNEL);
if (!rp) if (!rp)
goto out_nomem; goto out_nomem;
list_add(&rp->c_lru, &lru_head); list_add(&rp->c_lru, &lru_head);
@ -85,13 +91,18 @@ void nfsd_reply_cache_shutdown(void)
if (rp->c_state == RC_DONE && rp->c_type == RC_REPLBUFF) if (rp->c_state == RC_DONE && rp->c_type == RC_REPLBUFF)
kfree(rp->c_replvec.iov_base); kfree(rp->c_replvec.iov_base);
list_del(&rp->c_lru); list_del(&rp->c_lru);
kfree(rp); kmem_cache_free(drc_slab, rp);
} }
cache_disabled = 1; cache_disabled = 1;
kfree (cache_hash); kfree (cache_hash);
cache_hash = NULL; cache_hash = NULL;
if (drc_slab) {
kmem_cache_destroy(drc_slab);
drc_slab = NULL;
}
} }
/* /*