root/fs/nfsd/stats.c

DEFINITIONS

1. nfsd_proc_show
2. nfsd_proc_open
3. nfsd_stat_init
4. nfsd_stat_shutdown

   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 
  32 struct nfsd_stats       nfsdstats;
  33 struct svc_stat         nfsd_svcstats = {
  34         .program        = &nfsd_program,
  35 };
  36 
  37 static 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 
  82 static int nfsd_proc_open(struct inode *inode, struct file *file)
  83 {
  84         return single_open(file, nfsd_proc_show, NULL);
  85 }
  86 
  87 static 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 
  94 void
  95 nfsd_stat_init(void)
  96 {
  97         svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_fops);
  98 }
  99 
 100 void
 101 nfsd_stat_shutdown(void)
 102 {
 103         svc_proc_unregister(&init_net, "nfsd");
 104 }