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nfsd: track memory utilization by the DRC

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Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2013-03-27 10:15:38 -04:00 committed by J. Bruce Fields
parent 9dc56143c2
commit 6c6910cd4d
1 changed files with 17 additions and 5 deletions
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22
fs/nfsd/nfscache.c
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@ -38,6 +38,9 @@ static unsigned int num_drc_entries;
/* cache misses due only to checksum comparison failures */
static unsigned int payload_misses;
/* amount of memory (in bytes) currently consumed by the DRC */
static unsigned int drc_mem_usage;
/*
* Calculate the hash index from an XID.
*/
@ -112,12 +115,15 @@ nfsd_reply_cache_alloc(void)
static void
nfsd_reply_cache_free_locked(struct svc_cacherep *rp)
{
if (rp->c_type == RC_REPLBUFF)
if (rp->c_type == RC_REPLBUFF && rp->c_replvec.iov_base) {
drc_mem_usage -= rp->c_replvec.iov_len;
kfree(rp->c_replvec.iov_base);
}
if (!hlist_unhashed(&rp->c_hash))
hlist_del(&rp->c_hash);
list_del(&rp->c_lru);
--num_drc_entries;
drc_mem_usage -= sizeof(*rp);
kmem_cache_free(drc_slab, rp);
}
@ -372,8 +378,10 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
spin_unlock(&cache_lock);
rp = nfsd_reply_cache_alloc();
spin_lock(&cache_lock);
if (likely(rp))
if (likely(rp)) {
++num_drc_entries;
drc_mem_usage += sizeof(*rp);
}
search_cache:
found = nfsd_cache_search(rqstp, csum);
@ -415,6 +423,7 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
/* release any buffer */
if (rp->c_type == RC_REPLBUFF) {
drc_mem_usage -= rp->c_replvec.iov_len;
kfree(rp->c_replvec.iov_base);
rp->c_replvec.iov_base = NULL;
}
@ -483,6 +492,7 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
struct svc_cacherep *rp = rqstp->rq_cacherep;
struct kvec *resv = &rqstp->rq_res.head[0], *cachv;
int len;
size_t bufsize = 0;
if (!rp)
return;
@ -504,19 +514,21 @@ nfsd_cache_update(struct svc_rqst *rqstp, int cachetype, __be32 *statp)
break;
case RC_REPLBUFF:
cachv = &rp->c_replvec;
cachv->iov_base = kmalloc(len << 2, GFP_KERNEL);
bufsize = len << 2;
cachv->iov_base = kmalloc(bufsize, GFP_KERNEL);
if (!cachv->iov_base) {
nfsd_reply_cache_free(rp);
return;
}
cachv->iov_len = len << 2;
memcpy(cachv->iov_base, statp, len << 2);
cachv->iov_len = bufsize;
memcpy(cachv->iov_base, statp, bufsize);
break;
case RC_NOCACHE:
nfsd_reply_cache_free(rp);
return;
}
spin_lock(&cache_lock);
drc_mem_usage += bufsize;
lru_put_end(rp);
rp->c_secure = rqstp->rq_secure;
rp->c_type = cachetype;