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| author | Jeff Layton <jlayton@redhat.com> | 2013-03-27 10:15:38 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2013-04-03 11:47:23 -0400 |
| commit | 6c6910cd4d0cdb905fbba8c751afd143696930f2 (patch) | |
| tree | aa0693b81ed491499a5f8a2f0b0057d0c25967d6 | |
| parent | 9dc56143c298692276231735ec6546c1fac596e0 (diff) | |
| download | linux-stable-6c6910cd4d0cdb905fbba8c751afd143696930f2.tar.gz linux-stable-6c6910cd4d0cdb905fbba8c751afd143696930f2.tar.bz2 linux-stable-6c6910cd4d0cdb905fbba8c751afd143696930f2.zip | |
nfsd: track memory utilization by the DRC
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
| -rw-r--r-- | fs/nfsd/nfscache.c | 22 |
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; |