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/sched.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/stat.h>
  30 #define __NO_VERSION__
  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 = { &nfsd_program, };
  40
  41 static int
  42 nfsd_proc_read(char *buffer, char **start, off_t offset, int count,
  43                                 int *eof, void *data)
  44 {
  45         int     len;
  46         int     i;
  47
  48         len = sprintf(buffer, "rc %u %u %u\nfh %u %u %u %u %u\nio %u %u\n",
  49                       nfsdstats.rchits,
  50                       nfsdstats.rcmisses,
  51                       nfsdstats.rcnocache,
  52                       nfsdstats.fh_stale,
  53                       nfsdstats.fh_lookup,
  54                       nfsdstats.fh_anon,
  55                       nfsdstats.fh_nocache_dir,
  56                       nfsdstats.fh_nocache_nondir,
  57                       nfsdstats.io_read,
  58                       nfsdstats.io_write);
  59         /* thread usage: */
  60         len += sprintf(buffer+len, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
  61         for (i=0; i<10; i++) {
  62                 unsigned int jifs = nfsdstats.th_usage[i];
  63                 unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
  64                 len += sprintf(buffer+len, " %u.%03u", sec, msec);
  65         }
  66
  67         /* newline and ra-cache */
  68         len += sprintf(buffer+len, "\nra %u", nfsdstats.ra_size);
  69         for (i=0; i<11; i++)
  70                 len += sprintf(buffer+len, " %u", nfsdstats.ra_depth[i]);
  71         len += sprintf(buffer+len, "\n");
  72
  73
  74         /* Assume we haven't hit EOF yet. Will be set by svc_proc_read. */
  75         *eof = 0;
  76
  77         /*
  78          * Append generic nfsd RPC statistics if there's room for it.
  79          */
  80         if (len <= offset) {
  81                 len = svc_proc_read(buffer, start, offset - len, count,
  82                                     eof, data);
  83                 return len;
  84         }
  85
  86         if (len < count) {
  87                 len += svc_proc_read(buffer + len, start, 0, count - len,
  88                                      eof, data);
  89         }
  90
  91         if (offset >= len) {
  92                 *start = buffer;
  93                 return 0;
  94         }
  95
  96         *start = buffer + offset;
  97         if ((len -= offset) > count)
  98                 return count;
  99         return len;
 100 }
 101
 102 void
 103 nfsd_stat_init(void)
 104 {
 105         struct proc_dir_entry   *ent;
 106
 107         if ((ent = svc_proc_register(&nfsd_svcstats)) != 0) {
 108                 ent->read_proc = nfsd_proc_read;
 109                 ent->owner = THIS_MODULE;
 110         }
 111 }
 112
 113 void
 114 nfsd_stat_shutdown(void)
 115 {
 116         svc_proc_unregister("nfsd");
 117 }