The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsd/stats.c

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    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 }

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