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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 | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 | ||
35 | #include "plot.h" | |
36 | #include "blkparse.h" | |
37 | #include "list.h" | |
38 | ||
e199d546 CM |
39 | static int line_len = 1024; |
40 | static char line[1024]; | |
41 | ||
9e066e23 | 42 | static pid_t blktrace_pid = 0; |
e199d546 | 43 | static pid_t mpstat_pid = 0; |
9e066e23 | 44 | |
2203e914 | 45 | char *blktrace_args[17 + MAX_DEVICES_PER_TRACE * 2] = { |
e199d546 | 46 | "blktrace", |
2203e914 | 47 | "-b", "8192", |
9e066e23 CM |
48 | "-a", "queue", |
49 | "-a", "complete", | |
50 | "-a", "issue", | |
bfb0e441 | 51 | "-a", "notify", |
2203e914 | 52 | "-D", ".", |
9e066e23 CM |
53 | NULL, |
54 | }; | |
55 | ||
e199d546 CM |
56 | char *mpstat_args[] = { |
57 | "mpstat", | |
58 | "-P", "ALL", "1", | |
59 | NULL, | |
60 | }; | |
61 | ||
2203e914 CM |
62 | #define DEST_DIR_INDEX 12 |
63 | #define LAST_ARG 13 | |
9e066e23 | 64 | |
e199d546 | 65 | int stop_tracer(pid_t *tracer_pid) |
9e066e23 CM |
66 | { |
67 | int ret; | |
e199d546 | 68 | pid_t pid = *tracer_pid; |
9e066e23 CM |
69 | pid_t pid_ret; |
70 | int status = 0; | |
71 | ||
e199d546 | 72 | if (pid == 0) |
9e066e23 CM |
73 | return 0; |
74 | ||
e199d546 | 75 | *tracer_pid = 0; |
9e066e23 CM |
76 | ret = kill(pid, SIGTERM); |
77 | if (ret) { | |
e199d546 CM |
78 | fprintf(stderr, "failed to stop tracer pid %lu error %s\n", |
79 | (unsigned long)pid, strerror(errno)); | |
9e066e23 CM |
80 | return -errno; |
81 | } | |
82 | pid_ret = waitpid(pid, &status, WUNTRACED); | |
83 | if (pid_ret == pid && WIFEXITED(status) == 0) { | |
84 | fprintf(stderr, "blktrace returns error %d\n", WEXITSTATUS(status)); | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
89 | ||
90 | void stop_all_tracers(void) | |
91 | { | |
e199d546 CM |
92 | stop_tracer(&blktrace_pid); |
93 | stop_tracer(&mpstat_pid); | |
9e066e23 CM |
94 | } |
95 | ||
96 | void sig_handler_for_quit(int val) | |
97 | { | |
98 | fprintf(stderr, "iowatcher exiting with %d, stopping tracers\n", val); | |
99 | stop_all_tracers(); | |
100 | } | |
101 | ||
102 | ||
2203e914 | 103 | int start_blktrace(char **devices, int num_devices, char *trace_name, char *dest) |
9e066e23 CM |
104 | { |
105 | pid_t pid; | |
106 | int ret; | |
107 | char **arg = blktrace_args; | |
2203e914 CM |
108 | int i; |
109 | int arg_index; | |
9e066e23 CM |
110 | |
111 | fprintf(stderr, "running blktrace"); | |
2203e914 CM |
112 | if (!trace_name) |
113 | trace_name = "trace"; | |
114 | ||
115 | arg_index = LAST_ARG; | |
116 | for (i = 0; i < num_devices; i++) { | |
117 | blktrace_args[arg_index++] = "-d"; | |
118 | blktrace_args[arg_index++] = devices[i]; | |
119 | } | |
120 | ||
121 | /* | |
122 | * single device traces use -o and are put into | |
123 | * the dest dir if provided | |
124 | */ | |
125 | if (num_devices == 1) { | |
126 | blktrace_args[arg_index++] = "-o"; | |
127 | blktrace_args[arg_index++] = trace_name; | |
128 | if (dest) | |
129 | blktrace_args[DEST_DIR_INDEX] = dest; | |
130 | } else { | |
131 | /* | |
132 | * multi device traces are put into a dest | |
133 | * dir based on the trace name | |
134 | */ | |
135 | blktrace_args[DEST_DIR_INDEX] = trace_name; | |
136 | } | |
137 | ||
138 | blktrace_args[arg_index] = NULL; | |
9e066e23 CM |
139 | |
140 | while(*arg) { | |
141 | fprintf(stderr, " %s", *arg); | |
142 | arg++; | |
143 | } | |
144 | fprintf(stderr, "\n"); | |
145 | ||
146 | ||
147 | pid = fork(); | |
148 | if (pid == 0) { | |
149 | ret = execvp("blktrace", blktrace_args); | |
150 | if (ret) { | |
151 | fprintf(stderr, "failed to exec blktrace error %s\n", strerror(errno)); | |
152 | exit(errno); | |
153 | } | |
154 | ||
155 | } else { | |
156 | blktrace_pid = pid; | |
157 | signal(SIGTERM, sig_handler_for_quit); | |
158 | signal(SIGINT, sig_handler_for_quit); | |
159 | } | |
160 | return 0; | |
161 | } | |
162 | ||
163 | int run_program(char *str) | |
164 | { | |
165 | int ret; | |
166 | ||
167 | fprintf(stderr, "running program %s\n", str); | |
168 | ret = system(str); | |
169 | if (ret == -1) { | |
170 | fprintf(stderr, "failed to run program %s error %s\n", str, strerror(errno)); | |
171 | stop_all_tracers(); | |
172 | return -errno; | |
173 | } | |
e199d546 | 174 | stop_all_tracers(); |
9e066e23 CM |
175 | return 0; |
176 | } | |
177 | ||
178 | int wait_for_tracers(void) | |
179 | { | |
180 | int status = 0; | |
e199d546 CM |
181 | if (blktrace_pid != 0) { |
182 | waitpid(blktrace_pid, &status, WUNTRACED); | |
183 | blktrace_pid = 0; | |
184 | } | |
185 | if (mpstat_pid != 0) { | |
186 | waitpid(mpstat_pid, &status, WUNTRACED); | |
187 | mpstat_pid = 0; | |
188 | } | |
9e066e23 CM |
189 | return 0; |
190 | } | |
191 | ||
192 | int blktrace_to_dump(char *trace_name) | |
193 | { | |
e199d546 | 194 | snprintf(line, line_len, "blkparse -O -i %s -d '%s.%s'", |
9e066e23 CM |
195 | trace_name, trace_name, "dump"); |
196 | ||
197 | system(line); | |
198 | return 0; | |
199 | } | |
e199d546 CM |
200 | |
201 | int start_mpstat(char *trace_name) | |
202 | { | |
203 | int fd; | |
204 | pid_t pid; | |
205 | ||
206 | snprintf(line, line_len, "%s.mpstat", trace_name); | |
207 | ||
eef996bc | 208 | fd = open(line, O_WRONLY | O_CREAT | O_TRUNC, 0600); |
e199d546 CM |
209 | if (fd < 0) { |
210 | fprintf(stderr, "unable to open %s for writing err %s\n", | |
211 | line, strerror(errno)); | |
212 | exit(1); | |
213 | } | |
214 | pid = fork(); | |
215 | if (pid == 0) { | |
216 | int ret; | |
217 | ||
218 | close(1); | |
219 | ret = dup2(fd, 1); | |
220 | if (ret < 0) { | |
221 | fprintf(stderr, "failed to setup output file for mpstat\n"); | |
222 | exit(1); | |
223 | } | |
224 | ret = execvp("mpstat", mpstat_args); | |
225 | if (ret < 0) { | |
226 | fprintf(stderr, "failed to exec mpstat err %s\n", | |
227 | strerror(ret)); | |
228 | exit(1); | |
229 | } | |
230 | } | |
231 | mpstat_pid = pid; | |
232 | return 0; | |
233 | } |