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Linux/net/sunrpc/stats.c

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  1 /*
  2  * linux/net/sunrpc/stats.c
  3  *
  4  * procfs-based user access to generic RPC statistics. The stats files
  5  * reside in /proc/net/rpc.
  6  *
  7  * The read routines assume that the buffer passed in is just big enough.
  8  * If you implement an RPC service that has its own stats routine which
  9  * appends the generic RPC stats, make sure you don't exceed the PAGE_SIZE
 10  * limit.
 11  *
 12  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/slab.h>
 17 
 18 #include <linux/init.h>
 19 #include <linux/kernel.h>
 20 #include <linux/proc_fs.h>
 21 #include <linux/seq_file.h>
 22 #include <linux/sunrpc/clnt.h>
 23 #include <linux/sunrpc/svcsock.h>
 24 #include <linux/sunrpc/metrics.h>
 25 #include <linux/rcupdate.h>
 26 
 27 #include <trace/events/sunrpc.h>
 28 
 29 #include "netns.h"
 30 
 31 #define RPCDBG_FACILITY RPCDBG_MISC
 32 
 33 /*
 34  * Get RPC client stats
 35  */
 36 static int rpc_proc_show(struct seq_file *seq, void *v) {
 37         const struct rpc_stat   *statp = seq->private;
 38         const struct rpc_program *prog = statp->program;
 39         unsigned int i, j;
 40 
 41         seq_printf(seq,
 42                 "net %u %u %u %u\n",
 43                         statp->netcnt,
 44                         statp->netudpcnt,
 45                         statp->nettcpcnt,
 46                         statp->nettcpconn);
 47         seq_printf(seq,
 48                 "rpc %u %u %u\n",
 49                         statp->rpccnt,
 50                         statp->rpcretrans,
 51                         statp->rpcauthrefresh);
 52 
 53         for (i = 0; i < prog->nrvers; i++) {
 54                 const struct rpc_version *vers = prog->version[i];
 55                 if (!vers)
 56                         continue;
 57                 seq_printf(seq, "proc%u %u",
 58                                         vers->number, vers->nrprocs);
 59                 for (j = 0; j < vers->nrprocs; j++)
 60                         seq_printf(seq, " %u", vers->counts[j]);
 61                 seq_putc(seq, '\n');
 62         }
 63         return 0;
 64 }
 65 
 66 static int rpc_proc_open(struct inode *inode, struct file *file)
 67 {
 68         return single_open(file, rpc_proc_show, PDE_DATA(inode));
 69 }
 70 
 71 static const struct file_operations rpc_proc_fops = {
 72         .owner = THIS_MODULE,
 73         .open = rpc_proc_open,
 74         .read  = seq_read,
 75         .llseek = seq_lseek,
 76         .release = single_release,
 77 };
 78 
 79 /*
 80  * Get RPC server stats
 81  */
 82 void svc_seq_show(struct seq_file *seq, const struct svc_stat *statp)
 83 {
 84         const struct svc_program *prog = statp->program;
 85         const struct svc_version *vers;
 86         unsigned int i, j;
 87 
 88         seq_printf(seq,
 89                 "net %u %u %u %u\n",
 90                         statp->netcnt,
 91                         statp->netudpcnt,
 92                         statp->nettcpcnt,
 93                         statp->nettcpconn);
 94         seq_printf(seq,
 95                 "rpc %u %u %u %u %u\n",
 96                         statp->rpccnt,
 97                         statp->rpcbadfmt+statp->rpcbadauth+statp->rpcbadclnt,
 98                         statp->rpcbadfmt,
 99                         statp->rpcbadauth,
100                         statp->rpcbadclnt);
101 
102         for (i = 0; i < prog->pg_nvers; i++) {
103                 vers = prog->pg_vers[i];
104                 if (!vers)
105                         continue;
106                 seq_printf(seq, "proc%d %u", i, vers->vs_nproc);
107                 for (j = 0; j < vers->vs_nproc; j++)
108                         seq_printf(seq, " %u", vers->vs_count[j]);
109                 seq_putc(seq, '\n');
110         }
111 }
112 EXPORT_SYMBOL_GPL(svc_seq_show);
113 
114 /**
115  * rpc_alloc_iostats - allocate an rpc_iostats structure
116  * @clnt: RPC program, version, and xprt
117  *
118  */
119 struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
120 {
121         struct rpc_iostats *stats;
122         int i;
123 
124         stats = kcalloc(clnt->cl_maxproc, sizeof(*stats), GFP_KERNEL);
125         if (stats) {
126                 for (i = 0; i < clnt->cl_maxproc; i++)
127                         spin_lock_init(&stats[i].om_lock);
128         }
129         return stats;
130 }
131 EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
132 
133 /**
134  * rpc_free_iostats - release an rpc_iostats structure
135  * @stats: doomed rpc_iostats structure
136  *
137  */
138 void rpc_free_iostats(struct rpc_iostats *stats)
139 {
140         kfree(stats);
141 }
142 EXPORT_SYMBOL_GPL(rpc_free_iostats);
143 
144 /**
145  * rpc_count_iostats_metrics - tally up per-task stats
146  * @task: completed rpc_task
147  * @op_metrics: stat structure for OP that will accumulate stats from @task
148  */
149 void rpc_count_iostats_metrics(const struct rpc_task *task,
150                                struct rpc_iostats *op_metrics)
151 {
152         struct rpc_rqst *req = task->tk_rqstp;
153         ktime_t backlog, execute, now;
154 
155         if (!op_metrics || !req)
156                 return;
157 
158         now = ktime_get();
159         spin_lock(&op_metrics->om_lock);
160 
161         op_metrics->om_ops++;
162         /* kernel API: om_ops must never become larger than om_ntrans */
163         op_metrics->om_ntrans += max(req->rq_ntrans, 1);
164         op_metrics->om_timeouts += task->tk_timeouts;
165 
166         op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
167         op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
168 
169         backlog = 0;
170         if (ktime_to_ns(req->rq_xtime)) {
171                 backlog = ktime_sub(req->rq_xtime, task->tk_start);
172                 op_metrics->om_queue = ktime_add(op_metrics->om_queue, backlog);
173         }
174 
175         op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
176 
177         execute = ktime_sub(now, task->tk_start);
178         op_metrics->om_execute = ktime_add(op_metrics->om_execute, execute);
179 
180         spin_unlock(&op_metrics->om_lock);
181 
182         trace_rpc_stats_latency(req->rq_task, backlog, req->rq_rtt, execute);
183 }
184 EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);
185 
186 /**
187  * rpc_count_iostats - tally up per-task stats
188  * @task: completed rpc_task
189  * @stats: array of stat structures
190  *
191  * Uses the statidx from @task
192  */
193 void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
194 {
195         rpc_count_iostats_metrics(task,
196                                   &stats[task->tk_msg.rpc_proc->p_statidx]);
197 }
198 EXPORT_SYMBOL_GPL(rpc_count_iostats);
199 
200 static void _print_name(struct seq_file *seq, unsigned int op,
201                         const struct rpc_procinfo *procs)
202 {
203         if (procs[op].p_name)
204                 seq_printf(seq, "\t%12s: ", procs[op].p_name);
205         else if (op == 0)
206                 seq_printf(seq, "\t        NULL: ");
207         else
208                 seq_printf(seq, "\t%12u: ", op);
209 }
210 
211 void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
212 {
213         struct rpc_iostats *stats = clnt->cl_metrics;
214         struct rpc_xprt *xprt;
215         unsigned int op, maxproc = clnt->cl_maxproc;
216 
217         if (!stats)
218                 return;
219 
220         seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
221         seq_printf(seq, "p/v: %u/%u (%s)\n",
222                         clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
223 
224         rcu_read_lock();
225         xprt = rcu_dereference(clnt->cl_xprt);
226         if (xprt)
227                 xprt->ops->print_stats(xprt, seq);
228         rcu_read_unlock();
229 
230         seq_printf(seq, "\tper-op statistics\n");
231         for (op = 0; op < maxproc; op++) {
232                 struct rpc_iostats *metrics = &stats[op];
233                 _print_name(seq, op, clnt->cl_procinfo);
234                 seq_printf(seq, "%lu %lu %lu %Lu %Lu %Lu %Lu %Lu\n",
235                                 metrics->om_ops,
236                                 metrics->om_ntrans,
237                                 metrics->om_timeouts,
238                                 metrics->om_bytes_sent,
239                                 metrics->om_bytes_recv,
240                                 ktime_to_ms(metrics->om_queue),
241                                 ktime_to_ms(metrics->om_rtt),
242                                 ktime_to_ms(metrics->om_execute));
243         }
244 }
245 EXPORT_SYMBOL_GPL(rpc_print_iostats);
246 
247 /*
248  * Register/unregister RPC proc files
249  */
250 static inline struct proc_dir_entry *
251 do_register(struct net *net, const char *name, void *data,
252             const struct file_operations *fops)
253 {
254         struct sunrpc_net *sn;
255 
256         dprintk("RPC:       registering /proc/net/rpc/%s\n", name);
257         sn = net_generic(net, sunrpc_net_id);
258         return proc_create_data(name, 0, sn->proc_net_rpc, fops, data);
259 }
260 
261 struct proc_dir_entry *
262 rpc_proc_register(struct net *net, struct rpc_stat *statp)
263 {
264         return do_register(net, statp->program->name, statp, &rpc_proc_fops);
265 }
266 EXPORT_SYMBOL_GPL(rpc_proc_register);
267 
268 void
269 rpc_proc_unregister(struct net *net, const char *name)
270 {
271         struct sunrpc_net *sn;
272 
273         sn = net_generic(net, sunrpc_net_id);
274         remove_proc_entry(name, sn->proc_net_rpc);
275 }
276 EXPORT_SYMBOL_GPL(rpc_proc_unregister);
277 
278 struct proc_dir_entry *
279 svc_proc_register(struct net *net, struct svc_stat *statp, const struct file_operations *fops)
280 {
281         return do_register(net, statp->program->pg_name, statp, fops);
282 }
283 EXPORT_SYMBOL_GPL(svc_proc_register);
284 
285 void
286 svc_proc_unregister(struct net *net, const char *name)
287 {
288         struct sunrpc_net *sn;
289 
290         sn = net_generic(net, sunrpc_net_id);
291         remove_proc_entry(name, sn->proc_net_rpc);
292 }
293 EXPORT_SYMBOL_GPL(svc_proc_unregister);
294 
295 int rpc_proc_init(struct net *net)
296 {
297         struct sunrpc_net *sn;
298 
299         dprintk("RPC:       registering /proc/net/rpc\n");
300         sn = net_generic(net, sunrpc_net_id);
301         sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
302         if (sn->proc_net_rpc == NULL)
303                 return -ENOMEM;
304 
305         return 0;
306 }
307 
308 void rpc_proc_exit(struct net *net)
309 {
310         dprintk("RPC:       unregistering /proc/net/rpc\n");
311         remove_proc_entry("rpc", net->proc_net);
312 }
313 
314 

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