root/fs/nfsd/stats.c

DEFINITIONS

1. nfsd_proc_show
2. nfsd_proc_open
3. nfsd_stat_init
4. nfsd_stat_shutdown

/*
 * 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/time.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stat.h>
#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 = {
        .program        = &nfsd_program,
};

static int nfsd_proc_show(struct seq_file *seq, void *v)
{
        int i;

        seq_printf(seq, "rc %u %u %u\nfh %u %u %u %u %u\nio %u %u\n",
                      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: */
        seq_printf(seq, "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;
                seq_printf(seq, " %u.%03u", sec, msec);
        }

        /* newline and ra-cache */
        seq_printf(seq, "\nra %u", nfsdstats.ra_size);
        for (i=0; i<11; i++)
                seq_printf(seq, " %u", nfsdstats.ra_depth[i]);
        seq_putc(seq, '\n');
        
        /* show my rpc info */
        svc_seq_show(seq, &nfsd_svcstats);

#ifdef CONFIG_NFSD_V4
        /* Show count for individual nfsv4 operations */
        /* Writing operation numbers 0 1 2 also for maintaining uniformity */
        seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
        for (i = 0; i <= LAST_NFS4_OP; i++)
                seq_printf(seq, " %u", nfsdstats.nfs4_opcount[i]);

        seq_putc(seq, '\n');
#endif

        return 0;
}

static int nfsd_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, nfsd_proc_show, NULL);
}

static const struct file_operations nfsd_proc_fops = {
        .owner = THIS_MODULE,
        .open = nfsd_proc_open,
        .read  = seq_read,
        .llseek = seq_lseek,
        .release = single_release,
};

void
nfsd_stat_init(void)
{
        svc_proc_register(&nfsd_svcstats, &nfsd_proc_fops);
}

void
nfsd_stat_shutdown(void)
{
        svc_proc_unregister("nfsd");
}