summaryrefslogtreecommitdiff
path: root/src/bootchart/bootchart.c
blob: 7affacfdbfebb01e685d1584ec18a464a75bc627 (plain)
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
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/***
  bootchart.c - This file is part of systemd-bootchart

  Copyright (C) 2009-2013 Intel Coproration

  Authors:
    Auke Kok <auke-jan.h.kok@intel.com>

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/

#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <getopt.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>


#include "bootchart.h"
#include "util.h"
#include "fileio.h"

double graph_start;
double log_start;
double sampletime[MAXSAMPLES];
struct ps_struct *ps_first;
struct block_stat_struct blockstat[MAXSAMPLES];
int entropy_avail[MAXSAMPLES];
struct cpu_stat_struct cpustat[MAXCPUS];
int pscount;
int cpus;
double interval;
FILE *of = NULL;
int overrun = 0;
static int exiting = 0;
int sysfd=-1;

/* graph defaults */
int entropy = 0;
int initcall = 1;
int relative;
int filter = 1;
int pss = 0;
int samples;
int len = 500; /* we record len+1 (1 start sample) */
double hz = 25.0;   /* 20 seconds log time */
double scale_x = 100.0; /* 100px = 1sec */
double scale_y = 20.0;  /* 16px = 1 process bar */

char init_path[PATH_MAX] = "/sbin/init";
char output_path[PATH_MAX] = "/run/log";

static struct rlimit rlim;

static void signal_handler(int sig)
{
        if (sig++)
                sig--;
        exiting = 1;
}


int main(int argc, char *argv[])
{
        _cleanup_free_ char *build = NULL;
        struct sigaction sig;
        struct ps_struct *ps;
        char output_file[PATH_MAX];
        char datestr[200];
        time_t t = 0;
        FILE *f;
        int gind;
        int i;

        rlim.rlim_cur = 4096;
        rlim.rlim_max = 4096;
        (void) setrlimit(RLIMIT_NOFILE, &rlim);

        f = fopen("/etc/systemd/bootchart.conf", "r");
        if (f) {
                char buf[256];
                char *key;
                char *val;

                while (fgets(buf, 80, f) != NULL) {
                        char *c;

                        c = strchr(buf, '\n');
                        if (c) *c = 0; /* remove trailing \n */

                        if (buf[0] == '#')
                                continue; /* comment line */

                        key = strtok(buf, "=");
                        if (!key)
                                continue;
                        val = strtok(NULL, "=");
                        if (!val)
                                continue;

                        // todo: filter leading/trailing whitespace

                        if (streq(key, "samples"))
                                len = atoi(val);
                        if (streq(key, "freq"))
                                hz = atof(val);
                        if (streq(key, "rel"))
                                relative = atoi(val);
                        if (streq(key, "filter"))
                                filter = atoi(val);
                        if (streq(key, "pss"))
                                pss = atoi(val);
                        if (streq(key, "output"))
                                strncpy(output_path, val, PATH_MAX - 1);
                        if (streq(key, "init"))
                                strncpy(init_path, val, PATH_MAX - 1);
                        if (streq(key, "scale_x"))
                                scale_x = atof(val);
                        if (streq(key, "scale_y"))
                                scale_y = atof(val);
                        if (streq(key, "entropy"))
                                entropy = atoi(val);
                }
                fclose(f);
        }

        while (1) {
                static struct option opts[] = {
                        {"rel", 0, NULL, 'r'},
                        {"freq", 1, NULL, 'f'},
                        {"samples", 1, NULL, 'n'},
                        {"pss", 0, NULL, 'p'},
                        {"output", 1, NULL, 'o'},
                        {"init", 1, NULL, 'i'},
                        {"filter", 0, NULL, 'F'},
                        {"help", 0, NULL, 'h'},
                        {"scale-x", 1, NULL, 'x'},
                        {"scale-y", 1, NULL, 'y'},
                        {"entropy", 0, NULL, 'e'},
                        {NULL, 0, NULL, 0}
                };

                gind = 0;

                i = getopt_long(argc, argv, "erpf:n:o:i:Fhx:y:", opts, &gind);
                if (i == -1)
                        break;
                switch (i) {
                case 'r':
                        relative = 1;
                        break;
                case 'f':
                        hz = atof(optarg);
                        break;
                case 'F':
                        filter = 0;
                        break;
                case 'n':
                        len = atoi(optarg);
                        break;
                case 'o':
                        strncpy(output_path, optarg, PATH_MAX - 1);
                        break;
                case 'i':
                        strncpy(init_path, optarg, PATH_MAX - 1);
                        break;
                case 'p':
                        pss = 1;
                        break;
                case 'x':
                        scale_x = atof(optarg);
                        break;
                case 'y':
                        scale_y = atof(optarg);
                        break;
                case 'e':
                        entropy = 1;
                        break;
                case 'h':
                        fprintf(stderr, "Usage: %s [OPTIONS]\n", argv[0]);
                        fprintf(stderr, " --rel,     -r            Record time relative to recording\n");
                        fprintf(stderr, " --freq,    -f N          Sample frequency [%f]\n", hz);
                        fprintf(stderr, " --samples, -n N          Stop sampling at [%d] samples\n", len);
                        fprintf(stderr, " --scale-x, -x N          Scale the graph horizontally [%f] \n", scale_x);
                        fprintf(stderr, " --scale-y, -y N          Scale the graph vertically [%f] \n", scale_y);
                        fprintf(stderr, " --pss,     -p            Enable PSS graph (CPU intensive)\n");
                        fprintf(stderr, " --entropy, -e            Enable the entropy_avail graph\n");
                        fprintf(stderr, " --output,  -o [PATH]     Path to output files [%s]\n", output_path);
                        fprintf(stderr, " --init,    -i [PATH]     Path to init executable [%s]\n", init_path);
                        fprintf(stderr, " --filter,  -F            Disable filtering of processes from the graph\n");
                        fprintf(stderr, "                          that are of less importance or short-lived\n");
                        fprintf(stderr, " --help,    -h            Display this message\n");
                        fprintf(stderr, "See the installed README and bootchartd.conf.example for more information.\n");
                        exit (EXIT_SUCCESS);
                        break;
                default:
                        break;
                }
        }

        if (len > MAXSAMPLES) {
                fprintf(stderr, "Error: samples exceeds maximum\n");
                exit(EXIT_FAILURE);
        }

        if (hz <= 0.0) {
                fprintf(stderr, "Error: Frequency needs to be > 0\n");
                exit(EXIT_FAILURE);
        }

        /*
         * If the kernel executed us through init=/sbin/bootchartd, then
         * fork:
         * - parent execs executable specified via init_path[] (/sbin/init by default) as pid=1
         * - child logs data
         */
        if (getpid() == 1) {
                if (fork()) {
                        /* parent */
                        execl(init_path, init_path, NULL);
                }
        }
	argv[0][0] = '@';

        /* start with empty ps LL */
        ps_first = calloc(1, sizeof(struct ps_struct));
        if (!ps_first) {
                perror("calloc(ps_struct)");
                exit(EXIT_FAILURE);
        }

        /* handle TERM/INT nicely */
        memset(&sig, 0, sizeof(struct sigaction));
        sig.sa_handler = signal_handler;
        sigaction(SIGHUP, &sig, NULL);

        interval = (1.0 / hz) * 1000000000.0;

        log_uptime();

        /* main program loop */
        while (!exiting) {
                int res;
                double sample_stop;
                struct timespec req;
                time_t newint_s;
                long newint_ns;
                double elapsed;
                double timeleft;

                sampletime[samples] = gettime_ns();

                if (!of && (access(output_path, R_OK|W_OK|X_OK) == 0)) {
                        t = time(NULL);
                        strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
                        snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", output_path, datestr);
                        of = fopen(output_file, "w");
                }

                if (sysfd < 0) {
                        sysfd = open("/sys", O_RDONLY);
                }

                if (!build) {
                        parse_env_file("/etc/os-release", NEWLINE,
                                       "PRETTY_NAME", &build,
                                       NULL);
                }

                /* wait for /proc to become available, discarding samples */
                if (!(graph_start > 0.0))
                        log_uptime();
                else
                        log_sample(samples);

                sample_stop = gettime_ns();

                elapsed = (sample_stop - sampletime[samples]) * 1000000000.0;
                timeleft = interval - elapsed;

                newint_s = (time_t)(timeleft / 1000000000.0);
                newint_ns = (long)(timeleft - (newint_s * 1000000000.0));

                /*
                 * check if we have not consumed our entire timeslice. If we
                 * do, don't sleep and take a new sample right away.
                 * we'll lose all the missed samples and overrun our total
                 * time
                 */
                if ((newint_ns > 0) || (newint_s > 0)) {
                        req.tv_sec = newint_s;
                        req.tv_nsec = newint_ns;

                        res = nanosleep(&req, NULL);
                        if (res) {
                                if (errno == EINTR) {
                                        /* caught signal, probably HUP! */
                                        break;
                                }
                                perror("nanosleep()");
                                exit (EXIT_FAILURE);
                        }
                } else {
                        overrun++;
                        /* calculate how many samples we lost and scrap them */
                        len = len + ((int)(newint_ns / interval));
                }

                samples++;

                if (samples > len)
                        break;

        }

        /* do some cleanup, close fd's */
        ps = ps_first;
        while (ps->next_ps) {
                ps = ps->next_ps;
                if (ps->schedstat)
                        close(ps->schedstat);
                if (ps->sched)
                        close(ps->sched);
                if (ps->smaps)
                        fclose(ps->smaps);
        }

        if (!of) {
                t = time(NULL);
                strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
                snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", output_path, datestr);
                of = fopen(output_file, "w");
        }

        if (!of) {
                perror("open output_file");
                exit (EXIT_FAILURE);
        }

        svg_do(build);

        fprintf(stderr, "bootchartd: Wrote %s\n", output_file);
        fclose(of);

        closedir(proc);
        close(sysfd);

        /* nitpic cleanups */
        ps = ps_first;
        while (ps->next_ps) {
                struct ps_struct *old = ps;
                ps = ps->next_ps;
                free(old->sample);
                free(old);
        }
        free(ps->sample);
        free(ps);

        /* don't complain when overrun once, happens most commonly on 1st sample */
        if (overrun > 1)
                fprintf(stderr, "bootchartd: Warning: sample time overrun %i times\n", overrun);

        return 0;
}