| 1 | /* |
| 2 | * Copyright (C) 2012 Fusion-io |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | * |
| 17 | * Parts of this file were imported from Jens Axboe's blktrace sources (also GPL) |
| 18 | */ |
| 19 | #include <sys/types.h> |
| 20 | #include <sys/stat.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <unistd.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <stdio.h> |
| 25 | #include <math.h> |
| 26 | #include <inttypes.h> |
| 27 | #include <string.h> |
| 28 | #include <asm/types.h> |
| 29 | #include <errno.h> |
| 30 | #include <sys/mman.h> |
| 31 | #include <time.h> |
| 32 | #include <signal.h> |
| 33 | #include <sys/wait.h> |
| 34 | #include <spawn.h> |
| 35 | |
| 36 | #include "plot.h" |
| 37 | #include "blkparse.h" |
| 38 | #include "list.h" |
| 39 | |
| 40 | extern char **environ; |
| 41 | |
| 42 | static int line_len = 1024; |
| 43 | static char line[1024]; |
| 44 | |
| 45 | static pid_t blktrace_pid = 0; |
| 46 | static pid_t mpstat_pid = 0; |
| 47 | |
| 48 | char *blktrace_args[17 + MAX_DEVICES_PER_TRACE * 2] = { |
| 49 | "blktrace", |
| 50 | "-b", "8192", |
| 51 | "-a", "queue", |
| 52 | "-a", "complete", |
| 53 | "-a", "issue", |
| 54 | "-a", "notify", |
| 55 | "-D", ".", |
| 56 | NULL, |
| 57 | }; |
| 58 | |
| 59 | char *mpstat_args[] = { |
| 60 | "mpstat", |
| 61 | "-P", "ALL", "1", |
| 62 | NULL, |
| 63 | }; |
| 64 | |
| 65 | #define DEST_DIR_INDEX 12 |
| 66 | #define LAST_ARG 13 |
| 67 | |
| 68 | int stop_tracer(pid_t *tracer_pid) |
| 69 | { |
| 70 | int ret; |
| 71 | pid_t pid = *tracer_pid; |
| 72 | pid_t pid_ret; |
| 73 | int status = 0; |
| 74 | |
| 75 | if (pid == 0) |
| 76 | return 0; |
| 77 | |
| 78 | *tracer_pid = 0; |
| 79 | ret = kill(pid, SIGTERM); |
| 80 | if (ret) { |
| 81 | fprintf(stderr, "failed to stop tracer pid %lu error %s\n", |
| 82 | (unsigned long)pid, strerror(errno)); |
| 83 | return -errno; |
| 84 | } |
| 85 | pid_ret = waitpid(pid, &status, WUNTRACED); |
| 86 | if (pid_ret == pid && WIFEXITED(status) == 0) { |
| 87 | fprintf(stderr, "blktrace returns error %d\n", WEXITSTATUS(status)); |
| 88 | } |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | void stop_all_tracers(void) |
| 94 | { |
| 95 | stop_tracer(&blktrace_pid); |
| 96 | stop_tracer(&mpstat_pid); |
| 97 | } |
| 98 | |
| 99 | void sig_handler_for_quit(int val) |
| 100 | { |
| 101 | fprintf(stderr, "iowatcher exiting with %d, stopping tracers\n", val); |
| 102 | stop_all_tracers(); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | int start_blktrace(char **devices, int num_devices, char *trace_name, char *dest) |
| 107 | { |
| 108 | pid_t pid; |
| 109 | int ret; |
| 110 | char **arg = blktrace_args; |
| 111 | int i; |
| 112 | int arg_index; |
| 113 | |
| 114 | fprintf(stderr, "running blktrace"); |
| 115 | if (!trace_name) |
| 116 | trace_name = "trace"; |
| 117 | |
| 118 | arg_index = LAST_ARG; |
| 119 | for (i = 0; i < num_devices; i++) { |
| 120 | blktrace_args[arg_index++] = "-d"; |
| 121 | blktrace_args[arg_index++] = devices[i]; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * single device traces use -o and are put into |
| 126 | * the dest dir if provided |
| 127 | */ |
| 128 | if (num_devices == 1) { |
| 129 | blktrace_args[arg_index++] = "-o"; |
| 130 | blktrace_args[arg_index++] = trace_name; |
| 131 | if (dest) |
| 132 | blktrace_args[DEST_DIR_INDEX] = dest; |
| 133 | } else { |
| 134 | /* |
| 135 | * multi device traces are put into a dest |
| 136 | * dir based on the trace name |
| 137 | */ |
| 138 | blktrace_args[DEST_DIR_INDEX] = trace_name; |
| 139 | } |
| 140 | |
| 141 | blktrace_args[arg_index] = NULL; |
| 142 | |
| 143 | while(*arg) { |
| 144 | fprintf(stderr, " %s", *arg); |
| 145 | arg++; |
| 146 | } |
| 147 | fprintf(stderr, "\n"); |
| 148 | |
| 149 | |
| 150 | pid = fork(); |
| 151 | if (pid == 0) { |
| 152 | ret = execvp("blktrace", blktrace_args); |
| 153 | if (ret) { |
| 154 | fprintf(stderr, "failed to exec blktrace error %s\n", strerror(errno)); |
| 155 | exit(errno); |
| 156 | } |
| 157 | |
| 158 | } else { |
| 159 | blktrace_pid = pid; |
| 160 | signal(SIGTERM, sig_handler_for_quit); |
| 161 | signal(SIGINT, sig_handler_for_quit); |
| 162 | } |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | int run_program(char *str) |
| 167 | { |
| 168 | int ret; |
| 169 | |
| 170 | fprintf(stderr, "running program %s\n", str); |
| 171 | ret = system(str); |
| 172 | if (ret == -1) { |
| 173 | fprintf(stderr, "failed to run program %s error %s\n", str, strerror(errno)); |
| 174 | stop_all_tracers(); |
| 175 | return -errno; |
| 176 | } |
| 177 | stop_all_tracers(); |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | int run_program2(int argc, char **argv) |
| 182 | { |
| 183 | int i; |
| 184 | int err; |
| 185 | pid_t pid; |
| 186 | |
| 187 | fprintf(stderr, "running"); |
| 188 | for (i = 0; i < argc; i++) |
| 189 | fprintf(stderr, " '%s'", argv[i]); |
| 190 | fprintf(stderr, "\n"); |
| 191 | |
| 192 | err = posix_spawnp(&pid, argv[0], NULL, NULL, argv, environ); |
| 193 | if (err != 0) { |
| 194 | fprintf(stderr, "%s failed with exit code %d\n", argv[0], err); |
| 195 | return err; |
| 196 | } |
| 197 | waitpid(pid, NULL, 0); |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | int wait_for_tracers(void) |
| 202 | { |
| 203 | int status = 0; |
| 204 | if (blktrace_pid != 0) { |
| 205 | waitpid(blktrace_pid, &status, WUNTRACED); |
| 206 | blktrace_pid = 0; |
| 207 | } |
| 208 | if (mpstat_pid != 0) { |
| 209 | waitpid(mpstat_pid, &status, WUNTRACED); |
| 210 | mpstat_pid = 0; |
| 211 | } |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | int blktrace_to_dump(char *trace_name) |
| 216 | { |
| 217 | char *argv[] = { |
| 218 | "blkparse", "-O", |
| 219 | "-i", NULL, |
| 220 | "-d", NULL, |
| 221 | NULL |
| 222 | }; |
| 223 | |
| 224 | argv[3] = trace_name; |
| 225 | snprintf(line, line_len, "%s.dump", trace_name); |
| 226 | argv[5] = line; |
| 227 | |
| 228 | return run_program2(6, argv); |
| 229 | } |
| 230 | |
| 231 | int start_mpstat(char *trace_name) |
| 232 | { |
| 233 | int fd; |
| 234 | pid_t pid; |
| 235 | |
| 236 | snprintf(line, line_len, "%s.mpstat", trace_name); |
| 237 | |
| 238 | fd = open(line, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
| 239 | if (fd < 0) { |
| 240 | fprintf(stderr, "unable to open %s for writing err %s\n", |
| 241 | line, strerror(errno)); |
| 242 | exit(1); |
| 243 | } |
| 244 | pid = fork(); |
| 245 | if (pid == 0) { |
| 246 | int ret; |
| 247 | |
| 248 | close(1); |
| 249 | ret = dup2(fd, 1); |
| 250 | if (ret < 0) { |
| 251 | fprintf(stderr, "failed to setup output file for mpstat\n"); |
| 252 | exit(1); |
| 253 | } |
| 254 | ret = execvp("mpstat", mpstat_args); |
| 255 | if (ret < 0) { |
| 256 | fprintf(stderr, "failed to exec mpstat err %s\n", |
| 257 | strerror(ret)); |
| 258 | exit(1); |
| 259 | } |
| 260 | } |
| 261 | mpstat_pid = pid; |
| 262 | return 0; |
| 263 | } |