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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 | // SPDX-License-Identifier: GPL-2.0 /* * * sched-pipe.c * * pipe: Benchmark for pipe() * * Based on pipe-test-1m.c by Ingo Molnar <mingo@redhat.com> * http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test-1m.c * Ported to perf by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> */ #include <subcmd/parse-options.h> #include <api/fs/fs.h> #include "bench.h" #include "util/cgroup.h" #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <signal.h> #include <sys/wait.h> #include <string.h> #include <errno.h> #include <fcntl.h> #include <assert.h> #include <sys/time.h> #include <sys/types.h> #include <sys/syscall.h> #include <linux/time64.h> #include <pthread.h> struct thread_data { int nr; int pipe_read; int pipe_write; bool cgroup_failed; pthread_t pthread; }; #define LOOPS_DEFAULT 1000000 static int loops = LOOPS_DEFAULT; /* Use processes by default: */ static bool threaded; static char *cgrp_names[2]; static struct cgroup *cgrps[2]; static int parse_two_cgroups(const struct option *opt __maybe_unused, const char *str, int unset __maybe_unused) { char *p = strdup(str); char *q; int ret = -1; if (p == NULL) { fprintf(stderr, "memory allocation failure\n"); return -1; } q = strchr(p, ','); if (q == NULL) { fprintf(stderr, "it should have two cgroup names: %s\n", p); goto out; } *q = '\0'; cgrp_names[0] = strdup(p); cgrp_names[1] = strdup(q + 1); if (cgrp_names[0] == NULL || cgrp_names[1] == NULL) { fprintf(stderr, "memory allocation failure\n"); goto out; } ret = 0; out: free(p); return ret; } static const struct option options[] = { OPT_INTEGER('l', "loop", &loops, "Specify number of loops"), OPT_BOOLEAN('T', "threaded", &threaded, "Specify threads/process based task setup"), OPT_CALLBACK('G', "cgroups", NULL, "SEND,RECV", "Put sender and receivers in given cgroups", parse_two_cgroups), OPT_END() }; static const char * const bench_sched_pipe_usage[] = { "perf bench sched pipe <options>", NULL }; static int enter_cgroup(int nr) { char buf[32]; int fd, len, ret; int saved_errno; struct cgroup *cgrp; pid_t pid; if (cgrp_names[nr] == NULL) return 0; if (cgrps[nr] == NULL) { cgrps[nr] = cgroup__new(cgrp_names[nr], /*do_open=*/true); if (cgrps[nr] == NULL) goto err; } cgrp = cgrps[nr]; if (threaded) pid = syscall(__NR_gettid); else pid = getpid(); snprintf(buf, sizeof(buf), "%d\n", pid); len = strlen(buf); /* try cgroup v2 interface first */ if (threaded) fd = openat(cgrp->fd, "cgroup.threads", O_WRONLY); else fd = openat(cgrp->fd, "cgroup.procs", O_WRONLY); /* try cgroup v1 if failed */ if (fd < 0 && errno == ENOENT) fd = openat(cgrp->fd, "tasks", O_WRONLY); if (fd < 0) goto err; ret = write(fd, buf, len); close(fd); if (ret != len) { printf("Cannot enter to cgroup: %s\n", cgrp->name); return -1; } return 0; err: saved_errno = errno; printf("Failed to open cgroup file in %s\n", cgrp_names[nr]); if (saved_errno == ENOENT) { char mnt[PATH_MAX]; if (cgroupfs_find_mountpoint(mnt, sizeof(mnt), "perf_event") == 0) printf(" Hint: create the cgroup first, like 'mkdir %s/%s'\n", mnt, cgrp_names[nr]); } else if (saved_errno == EACCES && geteuid() > 0) { printf(" Hint: try to run as root\n"); } return -1; } static void exit_cgroup(int nr) { cgroup__put(cgrps[nr]); free(cgrp_names[nr]); } static void *worker_thread(void *__tdata) { struct thread_data *td = __tdata; int m = 0, i; int ret; ret = enter_cgroup(td->nr); if (ret < 0) { td->cgroup_failed = true; return NULL; } for (i = 0; i < loops; i++) { if (!td->nr) { ret = read(td->pipe_read, &m, sizeof(int)); BUG_ON(ret != sizeof(int)); ret = write(td->pipe_write, &m, sizeof(int)); BUG_ON(ret != sizeof(int)); } else { ret = write(td->pipe_write, &m, sizeof(int)); BUG_ON(ret != sizeof(int)); ret = read(td->pipe_read, &m, sizeof(int)); BUG_ON(ret != sizeof(int)); } } return NULL; } int bench_sched_pipe(int argc, const char **argv) { struct thread_data threads[2] = {}; struct thread_data *td; int pipe_1[2], pipe_2[2]; struct timeval start, stop, diff; unsigned long long result_usec = 0; int nr_threads = 2; int t; /* * why does "ret" exist? * discarding returned value of read(), write() * causes error in building environment for perf */ int __maybe_unused ret, wait_stat; pid_t pid, retpid __maybe_unused; argc = parse_options(argc, argv, options, bench_sched_pipe_usage, 0); BUG_ON(pipe(pipe_1)); BUG_ON(pipe(pipe_2)); gettimeofday(&start, NULL); for (t = 0; t < nr_threads; t++) { td = threads + t; td->nr = t; if (t == 0) { td->pipe_read = pipe_1[0]; td->pipe_write = pipe_2[1]; } else { td->pipe_write = pipe_1[1]; td->pipe_read = pipe_2[0]; } } if (threaded) { for (t = 0; t < nr_threads; t++) { td = threads + t; ret = pthread_create(&td->pthread, NULL, worker_thread, td); BUG_ON(ret); } for (t = 0; t < nr_threads; t++) { td = threads + t; ret = pthread_join(td->pthread, NULL); BUG_ON(ret); } } else { pid = fork(); assert(pid >= 0); if (!pid) { worker_thread(threads + 0); exit(0); } else { worker_thread(threads + 1); } retpid = waitpid(pid, &wait_stat, 0); assert((retpid == pid) && WIFEXITED(wait_stat)); } gettimeofday(&stop, NULL); timersub(&stop, &start, &diff); exit_cgroup(0); exit_cgroup(1); if (threads[0].cgroup_failed || threads[1].cgroup_failed) return 0; switch (bench_format) { case BENCH_FORMAT_DEFAULT: printf("# Executed %d pipe operations between two %s\n\n", loops, threaded ? "threads" : "processes"); result_usec = diff.tv_sec * USEC_PER_SEC; result_usec += diff.tv_usec; printf(" %14s: %lu.%03lu [sec]\n\n", "Total time", (unsigned long) diff.tv_sec, (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); printf(" %14lf usecs/op\n", (double)result_usec / (double)loops); printf(" %14d ops/sec\n", (int)((double)loops / ((double)result_usec / (double)USEC_PER_SEC))); break; case BENCH_FORMAT_SIMPLE: printf("%lu.%03lu\n", (unsigned long) diff.tv_sec, (unsigned long) (diff.tv_usec / USEC_PER_MSEC)); break; default: /* reaching here is something disaster */ fprintf(stderr, "Unknown format:%d\n", bench_format); exit(1); break; } return 0; } |