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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 "netns.h"
 28 
 29 #define RPCDBG_FACILITY RPCDBG_MISC
 30 
 31 /*
 32  * Get RPC client stats
 33  */
 34 static int rpc_proc_show(struct seq_file *seq, void *v) {
 35         const struct rpc_stat   *statp = seq->private;
 36         const struct rpc_program *prog = statp->program;
 37         unsigned int i, j;
 38 
 39         seq_printf(seq,
 40                 "net %u %u %u %u\n",
 41                         statp->netcnt,
 42                         statp->netudpcnt,
 43                         statp->nettcpcnt,
 44                         statp->nettcpconn);
 45         seq_printf(seq,
 46                 "rpc %u %u %u\n",
 47                         statp->rpccnt,
 48                         statp->rpcretrans,
 49                         statp->rpcauthrefresh);
 50 
 51         for (i = 0; i < prog->nrvers; i++) {
 52                 const struct rpc_version *vers = prog->version[i];
 53                 if (!vers)
 54                         continue;
 55                 seq_printf(seq, "proc%u %u",
 56                                         vers->number, vers->nrprocs);
 57                 for (j = 0; j < vers->nrprocs; j++)
 58                         seq_printf(seq, " %u",
 59                                         vers->procs[j].p_count);
 60                 seq_putc(seq, '\n');
 61         }
 62         return 0;
 63 }
 64 
 65 static int rpc_proc_open(struct inode *inode, struct file *file)
 66 {
 67         return single_open(file, rpc_proc_show, PDE_DATA(inode));
 68 }
 69 
 70 static const struct file_operations rpc_proc_fops = {
 71         .owner = THIS_MODULE,
 72         .open = rpc_proc_open,
 73         .read  = seq_read,
 74         .llseek = seq_lseek,
 75         .release = single_release,
 76 };
 77 
 78 /*
 79  * Get RPC server stats
 80  */
 81 void svc_seq_show(struct seq_file *seq, const struct svc_stat *statp) {
 82         const struct svc_program *prog = statp->program;
 83         const struct svc_procedure *proc;
 84         const struct svc_version *vers;
 85         unsigned int i, j;
 86 
 87         seq_printf(seq,
 88                 "net %u %u %u %u\n",
 89                         statp->netcnt,
 90                         statp->netudpcnt,
 91                         statp->nettcpcnt,
 92                         statp->nettcpconn);
 93         seq_printf(seq,
 94                 "rpc %u %u %u %u %u\n",
 95                         statp->rpccnt,
 96                         statp->rpcbadfmt+statp->rpcbadauth+statp->rpcbadclnt,
 97                         statp->rpcbadfmt,
 98                         statp->rpcbadauth,
 99                         statp->rpcbadclnt);
100 
101         for (i = 0; i < prog->pg_nvers; i++) {
102                 if (!(vers = prog->pg_vers[i]) || !(proc = vers->vs_proc))
103                         continue;
104                 seq_printf(seq, "proc%d %u", i, vers->vs_nproc);
105                 for (j = 0; j < vers->vs_nproc; j++, proc++)
106                         seq_printf(seq, " %u", proc->pc_count);
107                 seq_putc(seq, '\n');
108         }
109 }
110 EXPORT_SYMBOL_GPL(svc_seq_show);
111 
112 /**
113  * rpc_alloc_iostats - allocate an rpc_iostats structure
114  * @clnt: RPC program, version, and xprt
115  *
116  */
117 struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
118 {
119         struct rpc_iostats *stats;
120         int i;
121 
122         stats = kcalloc(clnt->cl_maxproc, sizeof(*stats), GFP_KERNEL);
123         if (stats) {
124                 for (i = 0; i < clnt->cl_maxproc; i++)
125                         spin_lock_init(&stats[i].om_lock);
126         }
127         return stats;
128 }
129 EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
130 
131 /**
132  * rpc_free_iostats - release an rpc_iostats structure
133  * @stats: doomed rpc_iostats structure
134  *
135  */
136 void rpc_free_iostats(struct rpc_iostats *stats)
137 {
138         kfree(stats);
139 }
140 EXPORT_SYMBOL_GPL(rpc_free_iostats);
141 
142 /**
143  * rpc_count_iostats_metrics - tally up per-task stats
144  * @task: completed rpc_task
145  * @op_metrics: stat structure for OP that will accumulate stats from @task
146  */
147 void rpc_count_iostats_metrics(const struct rpc_task *task,
148                                struct rpc_iostats *op_metrics)
149 {
150         struct rpc_rqst *req = task->tk_rqstp;
151         ktime_t delta, now;
152 
153         if (!op_metrics || !req)
154                 return;
155 
156         now = ktime_get();
157         spin_lock(&op_metrics->om_lock);
158 
159         op_metrics->om_ops++;
160         op_metrics->om_ntrans += req->rq_ntrans;
161         op_metrics->om_timeouts += task->tk_timeouts;
162 
163         op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
164         op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
165 
166         delta = ktime_sub(req->rq_xtime, task->tk_start);
167         op_metrics->om_queue = ktime_add(op_metrics->om_queue, delta);
168 
169         op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
170 
171         delta = ktime_sub(now, task->tk_start);
172         op_metrics->om_execute = ktime_add(op_metrics->om_execute, delta);
173 
174         spin_unlock(&op_metrics->om_lock);
175 }
176 EXPORT_SYMBOL_GPL(rpc_count_iostats_metrics);
177 
178 /**
179  * rpc_count_iostats - tally up per-task stats
180  * @task: completed rpc_task
181  * @stats: array of stat structures
182  *
183  * Uses the statidx from @task
184  */
185 void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
186 {
187         rpc_count_iostats_metrics(task,
188                                   &stats[task->tk_msg.rpc_proc->p_statidx]);
189 }
190 EXPORT_SYMBOL_GPL(rpc_count_iostats);
191 
192 static void _print_name(struct seq_file *seq, unsigned int op,
193                         struct rpc_procinfo *procs)
194 {
195         if (procs[op].p_name)
196                 seq_printf(seq, "\t%12s: ", procs[op].p_name);
197         else if (op == 0)
198                 seq_printf(seq, "\t        NULL: ");
199         else
200                 seq_printf(seq, "\t%12u: ", op);
201 }
202 
203 void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
204 {
205         struct rpc_iostats *stats = clnt->cl_metrics;
206         struct rpc_xprt *xprt;
207         unsigned int op, maxproc = clnt->cl_maxproc;
208 
209         if (!stats)
210                 return;
211 
212         seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
213         seq_printf(seq, "p/v: %u/%u (%s)\n",
214                         clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
215 
216         rcu_read_lock();
217         xprt = rcu_dereference(clnt->cl_xprt);
218         if (xprt)
219                 xprt->ops->print_stats(xprt, seq);
220         rcu_read_unlock();
221 
222         seq_printf(seq, "\tper-op statistics\n");
223         for (op = 0; op < maxproc; op++) {
224                 struct rpc_iostats *metrics = &stats[op];
225                 _print_name(seq, op, clnt->cl_procinfo);
226                 seq_printf(seq, "%lu %lu %lu %Lu %Lu %Lu %Lu %Lu\n",
227                                 metrics->om_ops,
228                                 metrics->om_ntrans,
229                                 metrics->om_timeouts,
230                                 metrics->om_bytes_sent,
231                                 metrics->om_bytes_recv,
232                                 ktime_to_ms(metrics->om_queue),
233                                 ktime_to_ms(metrics->om_rtt),
234                                 ktime_to_ms(metrics->om_execute));
235         }
236 }
237 EXPORT_SYMBOL_GPL(rpc_print_iostats);
238 
239 /*
240  * Register/unregister RPC proc files
241  */
242 static inline struct proc_dir_entry *
243 do_register(struct net *net, const char *name, void *data,
244             const struct file_operations *fops)
245 {
246         struct sunrpc_net *sn;
247 
248         dprintk("RPC:       registering /proc/net/rpc/%s\n", name);
249         sn = net_generic(net, sunrpc_net_id);
250         return proc_create_data(name, 0, sn->proc_net_rpc, fops, data);
251 }
252 
253 struct proc_dir_entry *
254 rpc_proc_register(struct net *net, struct rpc_stat *statp)
255 {
256         return do_register(net, statp->program->name, statp, &rpc_proc_fops);
257 }
258 EXPORT_SYMBOL_GPL(rpc_proc_register);
259 
260 void
261 rpc_proc_unregister(struct net *net, const char *name)
262 {
263         struct sunrpc_net *sn;
264 
265         sn = net_generic(net, sunrpc_net_id);
266         remove_proc_entry(name, sn->proc_net_rpc);
267 }
268 EXPORT_SYMBOL_GPL(rpc_proc_unregister);
269 
270 struct proc_dir_entry *
271 svc_proc_register(struct net *net, struct svc_stat *statp, const struct file_operations *fops)
272 {
273         return do_register(net, statp->program->pg_name, statp, fops);
274 }
275 EXPORT_SYMBOL_GPL(svc_proc_register);
276 
277 void
278 svc_proc_unregister(struct net *net, const char *name)
279 {
280         struct sunrpc_net *sn;
281 
282         sn = net_generic(net, sunrpc_net_id);
283         remove_proc_entry(name, sn->proc_net_rpc);
284 }
285 EXPORT_SYMBOL_GPL(svc_proc_unregister);
286 
287 int rpc_proc_init(struct net *net)
288 {
289         struct sunrpc_net *sn;
290 
291         dprintk("RPC:       registering /proc/net/rpc\n");
292         sn = net_generic(net, sunrpc_net_id);
293         sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
294         if (sn->proc_net_rpc == NULL)
295                 return -ENOMEM;
296 
297         return 0;
298 }
299 
300 void rpc_proc_exit(struct net *net)
301 {
302         dprintk("RPC:       unregistering /proc/net/rpc\n");
303         remove_proc_entry("rpc", net->proc_net);
304 }
305 
306 

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