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authorJeff Layton <jlayton@redhat.com>2013-03-27 10:15:38 -0400
committerJ. Bruce Fields <bfields@redhat.com>2013-04-03 11:47:23 -0400
commit6c6910cd4d0cdb905fbba8c751afd143696930f2 (patch)
treeaa0693b81ed491499a5f8a2f0b0057d0c25967d6 /fs/nfsd/nfscache.c
parent9dc56143c298692276231735ec6546c1fac596e0 (diff)
nfsd: track memory utilization by the DRC
Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/nfscache.c')
-rw-r--r--fs/nfsd/nfscache.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 48f5ef944234..1f45b3353bb1 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -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 @@ search_cache:
/* 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;