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 }
118
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