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This allows us to move the updates for th_cnt out of the mutex. This is a step towards reducing mutex coverage in nfsd(). Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* procfs-based user access to knfsd statistics
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*
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* /proc/net/rpc/nfsd
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*
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* Format:
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* rc <hits> <misses> <nocache>
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* Statistsics for the reply cache
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* fh <stale> <deprecated filehandle cache stats>
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* statistics for filehandle lookup
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* io <bytes-read> <bytes-written>
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* statistics for IO throughput
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* th <threads> <deprecated thread usage histogram stats>
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* number of threads
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* ra <deprecated ra-cache stats>
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*
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* plus generic RPC stats (see net/sunrpc/stats.c)
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*
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* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/sunrpc/stats.h>
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#include <net/net_namespace.h>
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#include "nfsd.h"
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struct nfsd_stats nfsdstats;
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struct svc_stat nfsd_svcstats = {
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.program = &nfsd_program,
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};
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static int nfsd_proc_show(struct seq_file *seq, void *v)
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{
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int i;
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seq_printf(seq, "rc %lld %lld %lld\nfh %lld 0 0 0 0\nio %lld %lld\n",
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_HITS]),
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_MISSES]),
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_RC_NOCACHE]),
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_FH_STALE]),
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_READ]),
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_IO_WRITE]));
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/* thread usage: */
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seq_printf(seq, "th %u 0", atomic_read(&nfsdstats.th_cnt));
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/* deprecated thread usage histogram stats */
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for (i = 0; i < 10; i++)
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seq_puts(seq, " 0.000");
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/* deprecated ra-cache stats */
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seq_puts(seq, "\nra 0 0 0 0 0 0 0 0 0 0 0 0\n");
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/* show my rpc info */
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svc_seq_show(seq, &nfsd_svcstats);
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#ifdef CONFIG_NFSD_V4
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/* Show count for individual nfsv4 operations */
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/* Writing operation numbers 0 1 2 also for maintaining uniformity */
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seq_printf(seq,"proc4ops %u", LAST_NFS4_OP + 1);
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for (i = 0; i <= LAST_NFS4_OP; i++) {
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seq_printf(seq, " %lld",
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percpu_counter_sum_positive(&nfsdstats.counter[NFSD_STATS_NFS4_OP(i)]));
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}
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seq_putc(seq, '\n');
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#endif
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return 0;
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}
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static int nfsd_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, nfsd_proc_show, NULL);
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}
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static const struct proc_ops nfsd_proc_ops = {
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.proc_open = nfsd_proc_open,
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.proc_read = seq_read,
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.proc_lseek = seq_lseek,
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.proc_release = single_release,
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};
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int nfsd_percpu_counters_init(struct percpu_counter counters[], int num)
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{
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int i, err = 0;
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for (i = 0; !err && i < num; i++)
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err = percpu_counter_init(&counters[i], 0, GFP_KERNEL);
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if (!err)
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return 0;
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for (; i > 0; i--)
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percpu_counter_destroy(&counters[i-1]);
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return err;
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}
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void nfsd_percpu_counters_reset(struct percpu_counter counters[], int num)
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{
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int i;
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for (i = 0; i < num; i++)
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percpu_counter_set(&counters[i], 0);
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}
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void nfsd_percpu_counters_destroy(struct percpu_counter counters[], int num)
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{
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int i;
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for (i = 0; i < num; i++)
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percpu_counter_destroy(&counters[i]);
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}
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static int nfsd_stat_counters_init(void)
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{
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return nfsd_percpu_counters_init(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
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}
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static void nfsd_stat_counters_destroy(void)
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{
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nfsd_percpu_counters_destroy(nfsdstats.counter, NFSD_STATS_COUNTERS_NUM);
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}
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int nfsd_stat_init(void)
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{
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int err;
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err = nfsd_stat_counters_init();
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if (err)
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return err;
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svc_proc_register(&init_net, &nfsd_svcstats, &nfsd_proc_ops);
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return 0;
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}
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void nfsd_stat_shutdown(void)
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{
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nfsd_stat_counters_destroy();
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svc_proc_unregister(&init_net, "nfsd");
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}
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