[PATCH v2 1/3] nfsd: remove unused stats counters

Amir Goldstein
2021-01-06T07:53:50Z

Commit 501cb1849f86 ("nfsd: rip out the raparms cache") removed the
code that updates read-ahead cache stats counters,
commit 8bbfa9f3889b ("knfsd: remove the nfsd thread busy histogram")
removed code that updates the thread busy stats counters back in 2009
and code that updated filehandle cache stats was removed back in 2002.

Remove the unused stats counters from nfsd_stats struct and print
hardcoded zeros in /proc/net/rpc/nfsd.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
fs/nfsd/stats.c | 41 ++++++++++++++++-------------------------
fs/nfsd/stats.h | 10 ----------
2 files changed, 16 insertions(+), 35 deletions(-)

diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
index b1bc582b0493..e928e224205a 100644
--- a/fs/nfsd/stats.c
+++ b/fs/nfsd/stats.c
@@ -7,16 +7,14 @@
* Format:
* rc <hits> <misses> <nocache>
* Statistsics for the reply cache
- * fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
+ * fh <stale> <deprecated filehandle cache stats>
* statistics for filehandle lookup
* io <bytes-read> <bytes-written>
* statistics for IO throughput
- * th <threads> <fullcnt> <10%-20%> <20%-30%> ... <90%-100%> <100%>
- * time (seconds) when nfsd thread usage above thresholds
- * and number of times that all threads were in use
- * ra cache-size <10% <20% <30% ... <100% not-found
- * number of times that read-ahead entry was found that deep in
- * the cache.
+ * th <threads> <deprecated thread usage histogram stats>
+ * number of threads
+ * ra <deprecated ra-cache stats>
+ *
* plus generic RPC stats (see net/sunrpc/stats.c)
*
* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
@@ -38,31 +36,24 @@ static int nfsd_proc_show(struct seq_file *seq, void *v)
{
int i;

- seq_printf(seq, "rc %u %u %u\nfh %u %u %u %u %u\nio %u %u\n",
+ seq_printf(seq, "rc %u %u %u\nfh %u 0 0 0 0\nio %u %u\n",
nfsdstats.rchits,
nfsdstats.rcmisses,
nfsdstats.rcnocache,
nfsdstats.fh_stale,
- nfsdstats.fh_lookup,
- nfsdstats.fh_anon,
- nfsdstats.fh_nocache_dir,
- nfsdstats.fh_nocache_nondir,
nfsdstats.io_read,
nfsdstats.io_write);
+
/* thread usage: */
- seq_printf(seq, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
- for (i=0; i<10; i++) {
- unsigned int jifs = nfsdstats.th_usage[i];
- unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
- seq_printf(seq, " %u.%03u", sec, msec);
- }
-
- /* newline and ra-cache */
- seq_printf(seq, "\nra %u", nfsdstats.ra_size);
- for (i=0; i<11; i++)
- seq_printf(seq, " %u", nfsdstats.ra_depth[i]);
- seq_putc(seq, '\n');
-
+ seq_printf(seq, "th %u 0", nfsdstats.th_cnt);
+
+ /* deprecated thread usage histogram stats */
+ for (i = 0; i < 10; i++)
+ seq_puts(seq, " 0.000");
+
+ /* deprecated ra-cache stats */
+ seq_puts(seq, "\nra 0 0 0 0 0 0 0 0 0 0 0 0\n");
+
/* show my rpc info */
svc_seq_show(seq, &nfsd_svcstats);

diff --git a/fs/nfsd/stats.h b/fs/nfsd/stats.h
index b23fdac69820..5e3cdf21556a 100644
--- a/fs/nfsd/stats.h
+++ b/fs/nfsd/stats.h
@@ -15,19 +15,9 @@ struct nfsd_stats {
unsigned int rcmisses; /* repcache hits */
unsigned int rcnocache; /* uncached reqs */
unsigned int fh_stale; /* FH stale error */
- unsigned int fh_lookup; /* dentry cached */
- unsigned int fh_anon; /* anon file dentry returned */
- unsigned int fh_nocache_dir; /* filehandle not found in dcache */
- unsigned int fh_nocache_nondir; /* filehandle not found in dcache */
unsigned int io_read; /* bytes returned to read requests */
unsigned int io_write; /* bytes passed in write requests */
unsigned int th_cnt; /* number of available threads */
- unsigned int th_usage[10]; /* number of ticks during which n perdeciles
- * of available threads were in use */
- unsigned int th_fullcnt; /* number of times last free thread was used */
- unsigned int ra_size; /* size of ra cache */
- unsigned int ra_depth[11]; /* number of times ra entry was found that deep
- * in the cache (10percentiles). [10] = not found */
#ifdef CONFIG_NFSD_V4
unsigned int nfs4_opcount[LAST_NFS4_OP + 1]; /* count of individual nfsv4 operations */
#endif
--
2.17.1