LXR linux/fs/nfsd/stats.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * procfs-based user access to knfsd statistics
   4 *
   5 * /proc/net/rpc/nfsd
   6 *
   7 * Format:
   8 *      rc <hits> <misses> <nocache>
   9 *                      Statistsics for the reply cache
  10 *      fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
  11 *                      statistics for filehandle lookup
  12 *      io <bytes-read> <bytes-written>
  13 *                      statistics for IO throughput
  14 *      th <threads> <fullcnt> <10%-20%> <20%-30%> ... <90%-100%> <100%> 
  15 *                      time (seconds) when nfsd thread usage above thresholds
  16 *                      and number of times that all threads were in use
  17 *      ra cache-size  <10%  <20%  <30% ... <100% not-found
  18 *                      number of times that read-ahead entry was found that deep in
  19 *                      the cache.
  20 *      plus generic RPC stats (see net/sunrpc/stats.c)
  21 *
  22 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
  23 */
  24
  25#include <linux/seq_file.h>
  26#include <linux/module.h>
  27#include <linux/sunrpc/stats.h>
  28#include <net/net_namespace.h>
  29
  30#include "nfsd.h"
  31
  32struct nfsd_stats       nfsdstats;
  33struct svc_stat         nfsd_svcstats = {
  34        .program        = &nfsd_program,
  35};
  36
  37static int nfsd_proc_show(struct seq_file *seq, void *v)
  38{
  39        int i;
  40
  41        seq_printf(seq, "rc %u %u %u\nfh %u %u %u %u %u\nio %u %u\n",
  42                      nfsdstats.rchits,
  43                      nfsdstats.rcmisses,
  44                      nfsdstats.rcnocache,
  45                      nfsdstats.fh_stale,
  46                      nfsdstats.fh_lookup,
  47                      nfsdstats.fh_anon,
  48                      nfsdstats.fh_nocache_dir,
  49                      nfsdstats.fh_nocache_nondir,
  50                      nfsdstats.io_read,
  51                      nfsdstats.io_write);
  52        /* thread usage: */
  53        seq_printf(seq, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
  54        for (i=0; i<10; i++) {
  55                unsigned int jifs = nfsdstats.th_usage[i];
  56                unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
  57                seq_printf(seq, " %u.%03u", sec, msec);
  58        }
  59
  60        /* newline and ra-cache */
  61        seq_printf(seq, "\nra %u", nfsdstats.ra_size);
  62        for (i=0; i<11; i++)
  63                seq_printf(seq, " %u", nfsdstats.ra_depth[i]);
  64        seq_putc(seq, '\n');
  65        
  66        /* show my rpc info */
  67        svc_seq_show(seq, &nfsd_svcstats);
  68
  69#ifdef CONFIG_NFSD_V4
  70        /* Show count for individual nfsv4 operations */
  71        /* Writing operation numbers 0 1 2 also for maintaining uniformity */
  72        seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
  73        for (i = 0; i <= LAST_NFS4_OP; i++)
  74                seq_printf(seq, " %u", nfsdstats.nfs4_opcount[i]);
  75
  76        seq_putc(seq, '\n');
  77#endif
  78
  79        return 0;
  80}
  81
  82static int nfsd_proc_open(struct inode *inode, struct file *file)
  83{
  84        return single_open(file, nfsd_proc_show, NULL);
  85}
  86
  87static const struct file_operations nfsd_proc_fops = {
  88        .open = nfsd_proc_open,
  89        .read  = seq_read,
  90        .llseek = seq_lseek,
  91        .release = single_release,
  92};
  93
  94void
  95nfsd_stat_init(void)
  96{
  97        svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_fops);
  98}
  99
 100void
 101nfsd_stat_shutdown(void)
 102{
 103        svc_proc_unregister(&init_net, "nfsd");
 104}
 105