nfsd: keep stats on worst hash balancing seen so far
The typical case with the DRC is a cache miss, so if we keep track of
the max number of entries that we've ever walked over in a search, then
we should have a reasonable estimate of the longest hash chain that
we've ever seen.
With that, we'll also keep track of the total size of the cache when we
see the longest chain. In the case of a tie, we prefer to track the
smallest total cache size in order to properly gauge the worst-case
ratio of max vs. avg chain length.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index fd81ca7..17cb0d6 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -41,6 +41,12 @@
/* amount of memory (in bytes) currently consumed by the DRC */
static unsigned int drc_mem_usage;
+/* longest hash chain seen */
+static unsigned int longest_chain;
+
+/* size of cache when we saw the longest hash chain */
+static unsigned int longest_chain_cachesize;
+
/*
* Calculate the hash index from an XID.
*/
@@ -319,15 +325,30 @@
static struct svc_cacherep *
nfsd_cache_search(struct svc_rqst *rqstp, __wsum csum)
{
- struct svc_cacherep *rp;
+ struct svc_cacherep *rp, *ret = NULL;
struct hlist_head *rh;
+ unsigned int entries = 0;
rh = &cache_hash[request_hash(rqstp->rq_xid)];
hlist_for_each_entry(rp, rh, c_hash) {
- if (nfsd_cache_match(rqstp, csum, rp))
- return rp;
+ ++entries;
+ if (nfsd_cache_match(rqstp, csum, rp)) {
+ ret = rp;
+ break;
+ }
}
- return NULL;
+
+ /* tally hash chain length stats */
+ if (entries > longest_chain) {
+ longest_chain = entries;
+ longest_chain_cachesize = num_drc_entries;
+ } else if (entries == longest_chain) {
+ /* prefer to keep the smallest cachesize possible here */
+ longest_chain_cachesize = min(longest_chain_cachesize,
+ num_drc_entries);
+ }
+
+ return ret;
}
/*
@@ -573,6 +594,8 @@
seq_printf(m, "cache misses: %u\n", nfsdstats.rcmisses);
seq_printf(m, "not cached: %u\n", nfsdstats.rcnocache);
seq_printf(m, "payload misses: %u\n", payload_misses);
+ seq_printf(m, "longest chain len: %u\n", longest_chain);
+ seq_printf(m, "cachesize at longest: %u\n", longest_chain_cachesize);
spin_unlock(&cache_lock);
return 0;
}