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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         return kcalloc(clnt->cl_maxproc, sizeof(struct rpc_iostats), GFP_KERNEL);
120 }
121 EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
122 
123 /**
124  * rpc_free_iostats - release an rpc_iostats structure
125  * @stats: doomed rpc_iostats structure
126  *
127  */
128 void rpc_free_iostats(struct rpc_iostats *stats)
129 {
130         kfree(stats);
131 }
132 EXPORT_SYMBOL_GPL(rpc_free_iostats);
133 
134 /**
135  * rpc_count_iostats - tally up per-task stats
136  * @task: completed rpc_task
137  * @stats: array of stat structures
138  *
139  * Relies on the caller for serialization.
140  */
141 void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats)
142 {
143         struct rpc_rqst *req = task->tk_rqstp;
144         struct rpc_iostats *op_metrics;
145         ktime_t delta;
146 
147         if (!stats || !req)
148                 return;
149 
150         op_metrics = &stats[task->tk_msg.rpc_proc->p_statidx];
151 
152         op_metrics->om_ops++;
153         op_metrics->om_ntrans += req->rq_ntrans;
154         op_metrics->om_timeouts += task->tk_timeouts;
155 
156         op_metrics->om_bytes_sent += req->rq_xmit_bytes_sent;
157         op_metrics->om_bytes_recv += req->rq_reply_bytes_recvd;
158 
159         delta = ktime_sub(req->rq_xtime, task->tk_start);
160         op_metrics->om_queue = ktime_add(op_metrics->om_queue, delta);
161 
162         op_metrics->om_rtt = ktime_add(op_metrics->om_rtt, req->rq_rtt);
163 
164         delta = ktime_sub(ktime_get(), task->tk_start);
165         op_metrics->om_execute = ktime_add(op_metrics->om_execute, delta);
166 }
167 EXPORT_SYMBOL_GPL(rpc_count_iostats);
168 
169 static void _print_name(struct seq_file *seq, unsigned int op,
170                         struct rpc_procinfo *procs)
171 {
172         if (procs[op].p_name)
173                 seq_printf(seq, "\t%12s: ", procs[op].p_name);
174         else if (op == 0)
175                 seq_printf(seq, "\t        NULL: ");
176         else
177                 seq_printf(seq, "\t%12u: ", op);
178 }
179 
180 void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
181 {
182         struct rpc_iostats *stats = clnt->cl_metrics;
183         struct rpc_xprt *xprt;
184         unsigned int op, maxproc = clnt->cl_maxproc;
185 
186         if (!stats)
187                 return;
188 
189         seq_printf(seq, "\tRPC iostats version: %s  ", RPC_IOSTATS_VERS);
190         seq_printf(seq, "p/v: %u/%u (%s)\n",
191                         clnt->cl_prog, clnt->cl_vers, clnt->cl_program->name);
192 
193         rcu_read_lock();
194         xprt = rcu_dereference(clnt->cl_xprt);
195         if (xprt)
196                 xprt->ops->print_stats(xprt, seq);
197         rcu_read_unlock();
198 
199         seq_printf(seq, "\tper-op statistics\n");
200         for (op = 0; op < maxproc; op++) {
201                 struct rpc_iostats *metrics = &stats[op];
202                 _print_name(seq, op, clnt->cl_procinfo);
203                 seq_printf(seq, "%lu %lu %lu %Lu %Lu %Lu %Lu %Lu\n",
204                                 metrics->om_ops,
205                                 metrics->om_ntrans,
206                                 metrics->om_timeouts,
207                                 metrics->om_bytes_sent,
208                                 metrics->om_bytes_recv,
209                                 ktime_to_ms(metrics->om_queue),
210                                 ktime_to_ms(metrics->om_rtt),
211                                 ktime_to_ms(metrics->om_execute));
212         }
213 }
214 EXPORT_SYMBOL_GPL(rpc_print_iostats);
215 
216 /*
217  * Register/unregister RPC proc files
218  */
219 static inline struct proc_dir_entry *
220 do_register(struct net *net, const char *name, void *data,
221             const struct file_operations *fops)
222 {
223         struct sunrpc_net *sn;
224 
225         dprintk("RPC:       registering /proc/net/rpc/%s\n", name);
226         sn = net_generic(net, sunrpc_net_id);
227         return proc_create_data(name, 0, sn->proc_net_rpc, fops, data);
228 }
229 
230 struct proc_dir_entry *
231 rpc_proc_register(struct net *net, struct rpc_stat *statp)
232 {
233         return do_register(net, statp->program->name, statp, &rpc_proc_fops);
234 }
235 EXPORT_SYMBOL_GPL(rpc_proc_register);
236 
237 void
238 rpc_proc_unregister(struct net *net, const char *name)
239 {
240         struct sunrpc_net *sn;
241 
242         sn = net_generic(net, sunrpc_net_id);
243         remove_proc_entry(name, sn->proc_net_rpc);
244 }
245 EXPORT_SYMBOL_GPL(rpc_proc_unregister);
246 
247 struct proc_dir_entry *
248 svc_proc_register(struct net *net, struct svc_stat *statp, const struct file_operations *fops)
249 {
250         return do_register(net, statp->program->pg_name, statp, fops);
251 }
252 EXPORT_SYMBOL_GPL(svc_proc_register);
253 
254 void
255 svc_proc_unregister(struct net *net, const char *name)
256 {
257         struct sunrpc_net *sn;
258 
259         sn = net_generic(net, sunrpc_net_id);
260         remove_proc_entry(name, sn->proc_net_rpc);
261 }
262 EXPORT_SYMBOL_GPL(svc_proc_unregister);
263 
264 int rpc_proc_init(struct net *net)
265 {
266         struct sunrpc_net *sn;
267 
268         dprintk("RPC:       registering /proc/net/rpc\n");
269         sn = net_generic(net, sunrpc_net_id);
270         sn->proc_net_rpc = proc_mkdir("rpc", net->proc_net);
271         if (sn->proc_net_rpc == NULL)
272                 return -ENOMEM;
273 
274         return 0;
275 }
276 
277 void rpc_proc_exit(struct net *net)
278 {
279         dprintk("RPC:       unregistering /proc/net/rpc\n");
280         remove_proc_entry("rpc", net->proc_net);
281 }
282 
283 

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