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 */
  34static 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
  65static int rpc_proc_open(struct inode *inode, struct file *file)
  66{
  67        return single_open(file, rpc_proc_show, PDE(inode)->data);
  68}
  69
  70static 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 */
  81void 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}
 110EXPORT_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 */
 117struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt)
 118{
 119        return kcalloc(clnt->cl_maxproc, sizeof(struct rpc_iostats), GFP_KERNEL);
 120}
 121EXPORT_SYMBOL_GPL(rpc_alloc_iostats);
 122
 123/**
 124 * rpc_free_iostats - release an rpc_iostats structure
 125 * @stats: doomed rpc_iostats structure
 126 *
 127 */
 128void rpc_free_iostats(struct rpc_iostats *stats)
 129{
 130        kfree(stats);
 131}
 132EXPORT_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 */
 141void 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}
 167EXPORT_SYMBOL_GPL(rpc_count_iostats);
 168
 169static 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
 180void 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_protname);
 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}
 214EXPORT_SYMBOL_GPL(rpc_print_iostats);
 215
 216/*
 217 * Register/unregister RPC proc files
 218 */
 219static inline struct proc_dir_entry *
 220do_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
 230struct proc_dir_entry *
 231rpc_proc_register(struct net *net, struct rpc_stat *statp)
 232{
 233        return do_register(net, statp->program->name, statp, &rpc_proc_fops);
 234}
 235EXPORT_SYMBOL_GPL(rpc_proc_register);
 236
 237void
 238rpc_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}
 245EXPORT_SYMBOL_GPL(rpc_proc_unregister);
 246
 247struct proc_dir_entry *
 248svc_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}
 252EXPORT_SYMBOL_GPL(svc_proc_register);
 253
 254void
 255svc_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}
 262EXPORT_SYMBOL_GPL(svc_proc_unregister);
 263
 264int 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
 277void 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