1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/net/sunrpc/stats.c
5 * procfs-based user access to generic RPC statistics. The stats files
6 * reside in /proc/net/rpc.
8 * The read routines assume that the buffer passed in is just big enough.
9 * If you implement an RPC service that has its own stats routine which
10 * appends the generic RPC stats, make sure you don't exceed the PAGE_SIZE
13 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
16 #include <linux/module.h>
17 #include <linux/slab.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/sunrpc/clnt.h>
24 #include <linux/sunrpc/svcsock.h>
25 #include <linux/sunrpc/metrics.h>
26 #include <linux/rcupdate.h>
28 #include <trace/events/sunrpc.h>
32 #define RPCDBG_FACILITY RPCDBG_MISC
35 * Get RPC client stats
37 static int rpc_proc_show(struct seq_file *seq, void *v) {
38 const struct rpc_stat *statp = seq->private;
39 const struct rpc_program *prog = statp->program;
52 statp->rpcauthrefresh);
54 for (i = 0; i < prog->nrvers; i++) {
55 const struct rpc_version *vers = prog->version[i];
58 seq_printf(seq, "proc%u %u",
59 vers->number, vers->nrprocs);
60 for (j = 0; j < vers->nrprocs; j++)
61 seq_printf(seq, " %u", vers->counts[j]);
67 static int rpc_proc_open(struct inode *inode, struct file *file)
69 return single_open(file, rpc_proc_show, pde_data(inode));
72 static const struct proc_ops rpc_proc_ops = {
73 .proc_open = rpc_proc_open,
74 .proc_read = seq_read,
75 .proc_lseek = seq_lseek,
76 .proc_release = single_release,
80 * Get RPC server stats
82 void svc_seq_show(struct seq_file *seq, const struct svc_stat *statp)
84 const struct svc_program *prog = statp->program;
85 const struct svc_version *vers;
96 "rpc %u %u %u %u %u\n",
98 statp->rpcbadfmt+statp->rpcbadauth+statp->rpcbadclnt,
103 for (i = 0; i < prog->pg_nvers; i++) {
104 vers = prog->pg_vers[i];
107 seq_printf(seq, "proc%d %u", i, vers->vs_nproc);
108 for (j = 0; j < vers->vs_nproc; j++) {
110 for_each_possible_cpu(k)
111 count += per_cpu(vers->vs_count[j], k);
112 seq_printf(seq, " %lu", count);
117 EXPORT_SYMBOL_GPL(svc_seq_show);
120 * rpc_alloc_iostats - allocate an rpc_iostats structure
121 * @clnt: RPC program, version, and xprt
124 struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
126 struct rpc_iostats *stats;
129 stats = kcalloc(clnt->cl_maxproc, sizeof(*stats), GFP_KERNEL);
131 for (i = 0; i < clnt->cl_maxproc; i++)
132 spin_lock_init(&stats[i].om_lock);
136 EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
139 * rpc_free_iostats - release an rpc_iostats structure
140 * @stats: doomed rpc_iostats structure
143 void rpc_free_iostats(struct rpc_iostats *stats)
147 EXPORT_SYMBOL_GPL(rpc_free_iostats);
150 * rpc_count_iostats_metrics - tally up per-task stats
151 * @task: completed rpc_task
152 * @op_metrics: stat structure for OP that will accumulate stats from @task
154 void rpc_count_iostats_metrics(const struct rpc_task *task,
155 struct rpc_iostats *op_metrics)
157 struct rpc_rqst *req = task->tk_rqstp;
158 ktime_t backlog, execute, now;
160 if (!op_metrics || !req)
164 spin_lock(&op_metrics->om_lock);
166 op_metrics->om_ops++;
167 /* kernel API: om_ops must never become larger than om_ntrans */
168 op_metrics->om_ntrans += max(req->rq_ntrans, 1);
169 op_metrics->om_timeouts += task->tk_timeouts;
171 op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
172 op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
175 if (ktime_to_ns(req->rq_xtime)) {
176 backlog = ktime_sub(req->rq_xtime, task->tk_start);
177 op_metrics->om_queue = ktime_add(op_metrics->om_queue, backlog);
180 op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
182 execute = ktime_sub(now, task->tk_start);
183 op_metrics->om_execute = ktime_add(op_metrics->om_execute, execute);
184 if (task->tk_status < 0)
185 op_metrics->om_error_status++;
187 spin_unlock(&op_metrics->om_lock);
189 trace_rpc_stats_latency(req->rq_task, backlog, req->rq_rtt, execute);
191 EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);
194 * rpc_count_iostats - tally up per-task stats
195 * @task: completed rpc_task
196 * @stats: array of stat structures
198 * Uses the statidx from @task
200 void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
202 rpc_count_iostats_metrics(task,
203 &stats[task->tk_msg.rpc_proc->p_statidx]);
205 EXPORT_SYMBOL_GPL(rpc_count_iostats);
207 static void _print_name(struct seq_file *seq, unsigned int op,
208 const struct rpc_procinfo *procs)
210 if (procs[op].p_name)
211 seq_printf(seq, "\t%12s: ", procs[op].p_name);
213 seq_printf(seq, "\t NULL: ");
215 seq_printf(seq, "\t%12u: ", op);
218 static void _add_rpc_iostats(struct rpc_iostats *a, struct rpc_iostats *b)
220 a->om_ops += b->om_ops;
221 a->om_ntrans += b->om_ntrans;
222 a->om_timeouts += b->om_timeouts;
223 a->om_bytes_sent += b->om_bytes_sent;
224 a->om_bytes_recv += b->om_bytes_recv;
225 a->om_queue = ktime_add(a->om_queue, b->om_queue);
226 a->om_rtt = ktime_add(a->om_rtt, b->om_rtt);
227 a->om_execute = ktime_add(a->om_execute, b->om_execute);
228 a->om_error_status += b->om_error_status;
231 static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
232 int op, const struct rpc_procinfo *procs)
234 _print_name(seq, op, procs);
235 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %llu %lu\n",
239 stats->om_bytes_sent,
240 stats->om_bytes_recv,
241 ktime_to_ms(stats->om_queue),
242 ktime_to_ms(stats->om_rtt),
243 ktime_to_ms(stats->om_execute),
244 stats->om_error_status);
247 static int do_print_stats(struct rpc_clnt *clnt, struct rpc_xprt *xprt, void *seqv)
249 struct seq_file *seq = seqv;
251 xprt->ops->print_stats(xprt, seq);
255 void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
257 unsigned int op, maxproc = clnt->cl_maxproc;
259 if (!clnt->cl_metrics)
262 seq_printf(seq, "\tRPC iostats version: %s ", RPC_IOSTATS_VERS);
263 seq_printf(seq, "p/v: %u/%u (%s)\n",
264 clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
266 rpc_clnt_iterate_for_each_xprt(clnt, do_print_stats, seq);
268 seq_printf(seq, "\tper-op statistics\n");
269 for (op = 0; op < maxproc; op++) {
270 struct rpc_iostats stats = {};
271 struct rpc_clnt *next = clnt;
273 _add_rpc_iostats(&stats, &next->cl_metrics[op]);
274 if (next == next->cl_parent)
276 next = next->cl_parent;
278 _print_rpc_iostats(seq, &stats, op, clnt->cl_procinfo);
281 EXPORT_SYMBOL_GPL(rpc_clnt_show_stats);
284 * Register/unregister RPC proc files
286 static inline struct proc_dir_entry *
287 do_register(struct net *net, const char *name, void *data,
288 const struct proc_ops *proc_ops)
290 struct sunrpc_net *sn;
292 dprintk("RPC: registering /proc/net/rpc/%s\n", name);
293 sn = net_generic(net, sunrpc_net_id);
294 return proc_create_data(name, 0, sn->proc_net_rpc, proc_ops, data);
297 struct proc_dir_entry *
298 rpc_proc_register(struct net *net, struct rpc_stat *statp)
300 return do_register(net, statp->program->name, statp, &rpc_proc_ops);
302 EXPORT_SYMBOL_GPL(rpc_proc_register);
305 rpc_proc_unregister(struct net *net, const char *name)
307 struct sunrpc_net *sn;
309 sn = net_generic(net, sunrpc_net_id);
310 remove_proc_entry(name, sn->proc_net_rpc);
312 EXPORT_SYMBOL_GPL(rpc_proc_unregister);
314 struct proc_dir_entry *
315 svc_proc_register(struct net *net, struct svc_stat *statp, const struct proc_ops *proc_ops)
317 return do_register(net, statp->program->pg_name, net, proc_ops);
319 EXPORT_SYMBOL_GPL(svc_proc_register);
322 svc_proc_unregister(struct net *net, const char *name)
324 struct sunrpc_net *sn;
326 sn = net_generic(net, sunrpc_net_id);
327 remove_proc_entry(name, sn->proc_net_rpc);
329 EXPORT_SYMBOL_GPL(svc_proc_unregister);
331 int rpc_proc_init(struct net *net)
333 struct sunrpc_net *sn;
335 dprintk("RPC: registering /proc/net/rpc\n");
336 sn = net_generic(net, sunrpc_net_id);
337 sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
338 if (sn->proc_net_rpc == NULL)
344 void rpc_proc_exit(struct net *net)
346 dprintk("RPC: unregistering /proc/net/rpc\n");
347 remove_proc_entry("rpc", net->proc_net);