fs/nfsd/stats.c

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