stats.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:3k
- /*
- * linux/fs/nfsd/stats.c
- *
- * procfs-based user access to knfsd statistics
- *
- * /proc/net/rpc/nfsd
- *
- * Format:
- * rc <hits> <misses> <nocache>
- * Statistsics for the reply cache
- * fh <stale> <total-lookups> <anonlookups> <dir-not-in-dcache> <nondir-not-in-dcache>
- * statistics for filehandle lookup
- * io <bytes-read> <bytes-writtten>
- * statistics for IO throughput
- * th <threads> <fullcnt> <10%-20%> <20%-30%> ... <90%-100%> <100%>
- * time (seconds) when nfsd thread usage above thresholds
- * and number of times that all threads were in use
- * ra cache-size <10% <20% <30% ... <100% not-found
- * number of times that read-ahead entry was found that deep in
- * the cache.
- * plus generic RPC stats (see net/sunrpc/stats.c)
- *
- * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #define __NO_VERSION__
- #include <linux/module.h>
- #include <linux/sunrpc/svc.h>
- #include <linux/sunrpc/stats.h>
- #include <linux/nfsd/nfsd.h>
- #include <linux/nfsd/stats.h>
- struct nfsd_stats nfsdstats;
- struct svc_stat nfsd_svcstats = { &nfsd_program, };
- static int
- nfsd_proc_read(char *buffer, char **start, off_t offset, int count,
- int *eof, void *data)
- {
- int len;
- int i;
- len = sprintf(buffer, "rc %u %u %unfh %u %u %u %u %unio %u %un",
- nfsdstats.rchits,
- nfsdstats.rcmisses,
- nfsdstats.rcnocache,
- nfsdstats.fh_stale,
- nfsdstats.fh_lookup,
- nfsdstats.fh_anon,
- nfsdstats.fh_nocache_dir,
- nfsdstats.fh_nocache_nondir,
- nfsdstats.io_read,
- nfsdstats.io_write);
- /* thread usage: */
- len += sprintf(buffer+len, "th %u %u", nfsdstats.th_cnt, nfsdstats.th_fullcnt);
- for (i=0; i<10; i++) {
- unsigned int jifs = nfsdstats.th_usage[i];
- unsigned int sec = jifs / HZ, msec = (jifs % HZ)*1000/HZ;
- len += sprintf(buffer+len, " %u.%03u", sec, msec);
- }
- /* newline and ra-cache */
- len += sprintf(buffer+len, "nra %u", nfsdstats.ra_size);
- for (i=0; i<11; i++)
- len += sprintf(buffer+len, " %u", nfsdstats.ra_depth[i]);
- len += sprintf(buffer+len, "n");
-
- /* Assume we haven't hit EOF yet. Will be set by svc_proc_read. */
- *eof = 0;
- /*
- * Append generic nfsd RPC statistics if there's room for it.
- */
- if (len <= offset) {
- len = svc_proc_read(buffer, start, offset - len, count,
- eof, data);
- return len;
- }
- if (len < count) {
- len += svc_proc_read(buffer + len, start, 0, count - len,
- eof, data);
- }
- if (offset >= len) {
- *start = buffer;
- return 0;
- }
- *start = buffer + offset;
- if ((len -= offset) > count)
- return count;
- return len;
- }
- void
- nfsd_stat_init(void)
- {
- struct proc_dir_entry *ent;
- if ((ent = svc_proc_register(&nfsd_svcstats)) != 0) {
- ent->read_proc = nfsd_proc_read;
- ent->owner = THIS_MODULE;
- }
- }
- void
- nfsd_stat_shutdown(void)
- {
- svc_proc_unregister("nfsd");
- }