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9e066e23 CM |
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 | |
660b0411 | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
9e066e23 CM |
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> | |
2ef0fdd4 | 34 | #include <spawn.h> |
9e066e23 CM |
35 | |
36 | #include "plot.h" | |
37 | #include "blkparse.h" | |
38 | #include "list.h" | |
39 | ||
2ef0fdd4 AP |
40 | extern char **environ; |
41 | ||
e199d546 CM |
42 | static int line_len = 1024; |
43 | static char line[1024]; | |
44 | ||
9e066e23 | 45 | static pid_t blktrace_pid = 0; |
e199d546 | 46 | static pid_t mpstat_pid = 0; |
9e066e23 | 47 | |
2203e914 | 48 | char *blktrace_args[17 + MAX_DEVICES_PER_TRACE * 2] = { |
e199d546 | 49 | "blktrace", |
2203e914 | 50 | "-b", "8192", |
9e066e23 CM |
51 | "-a", "queue", |
52 | "-a", "complete", | |
53 | "-a", "issue", | |
bfb0e441 | 54 | "-a", "notify", |
2203e914 | 55 | "-D", ".", |
9e066e23 CM |
56 | NULL, |
57 | }; | |
58 | ||
e199d546 CM |
59 | char *mpstat_args[] = { |
60 | "mpstat", | |
61 | "-P", "ALL", "1", | |
62 | NULL, | |
63 | }; | |
64 | ||
2203e914 CM |
65 | #define DEST_DIR_INDEX 12 |
66 | #define LAST_ARG 13 | |
9e066e23 | 67 | |
e199d546 | 68 | int stop_tracer(pid_t *tracer_pid) |
9e066e23 CM |
69 | { |
70 | int ret; | |
e199d546 | 71 | pid_t pid = *tracer_pid; |
9e066e23 CM |
72 | pid_t pid_ret; |
73 | int status = 0; | |
74 | ||
e199d546 | 75 | if (pid == 0) |
9e066e23 CM |
76 | return 0; |
77 | ||
e199d546 | 78 | *tracer_pid = 0; |
9e066e23 CM |
79 | ret = kill(pid, SIGTERM); |
80 | if (ret) { | |
e199d546 CM |
81 | fprintf(stderr, "failed to stop tracer pid %lu error %s\n", |
82 | (unsigned long)pid, strerror(errno)); | |
9e066e23 CM |
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 | { | |
e199d546 CM |
95 | stop_tracer(&blktrace_pid); |
96 | stop_tracer(&mpstat_pid); | |
9e066e23 CM |
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 | ||
2203e914 | 106 | int start_blktrace(char **devices, int num_devices, char *trace_name, char *dest) |
9e066e23 CM |
107 | { |
108 | pid_t pid; | |
109 | int ret; | |
110 | char **arg = blktrace_args; | |
2203e914 CM |
111 | int i; |
112 | int arg_index; | |
9e066e23 CM |
113 | |
114 | fprintf(stderr, "running blktrace"); | |
2203e914 CM |
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; | |
9e066e23 CM |
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 | } | |
e199d546 | 177 | stop_all_tracers(); |
9e066e23 CM |
178 | return 0; |
179 | } | |
180 | ||
c1ab63ed AP |
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 | ||
9e066e23 CM |
201 | int wait_for_tracers(void) |
202 | { | |
203 | int status = 0; | |
e199d546 CM |
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 | } | |
9e066e23 CM |
212 | return 0; |
213 | } | |
214 | ||
215 | int blktrace_to_dump(char *trace_name) | |
216 | { | |
2ef0fdd4 AP |
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 | ||
c1ab63ed | 228 | return run_program2(6, argv); |
9e066e23 | 229 | } |
e199d546 CM |
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 | ||
eef996bc | 238 | fd = open(line, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
e199d546 CM |
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 | } |