2 bootchart.c - This file is part of systemd-bootchart
4 Copyright (C) 2009-2013 Intel Coproration
7 Auke Kok <auke-jan.h.kok@intel.com>
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 Many thanks to those who contributed ideas and code:
26 - Ziga Mahkovec - Original bootchart author
27 - Anders Norgaard - PyBootchartgui
28 - Michael Meeks - bootchart2
29 - Scott James Remnant - Ubuntu C-based logger
30 - Arjan van der Ven - for the idea to merge bootgraph.pl functionality
35 #include <sys/types.h>
36 #include <sys/resource.h>
51 #include "bootchart.h"
55 #include "conf-parser.h"
57 #include "path-util.h"
61 double sampletime[MAXSAMPLES];
62 struct ps_struct *ps_first;
63 struct block_stat_struct blockstat[MAXSAMPLES];
64 int entropy_avail[MAXSAMPLES];
65 struct cpu_stat_struct cpustat[MAXCPUS];
71 static int exiting = 0;
77 bool relative = false;
81 int len = 500; /* we record len+1 (1 start sample) */
82 double hz = 25.0; /* 20 seconds log time */
83 double scale_x = 100.0; /* 100px = 1sec */
84 double scale_y = 20.0; /* 16px = 1 process bar */
86 char init_path[PATH_MAX] = "/sbin/init";
87 char output_path[PATH_MAX] = "/run/log";
89 static struct rlimit rlim;
91 static void signal_handler(int sig)
99 int main(int argc, char *argv[])
101 _cleanup_free_ char *build = NULL;
102 struct sigaction sig;
103 struct ps_struct *ps;
104 char output_file[PATH_MAX];
108 _cleanup_fclose_ FILE *f;
111 char *init = NULL, *output = NULL;
113 const ConfigTableItem items[] = {
114 { "Bootchart", "Samples", config_parse_int, 0, &len },
115 { "Bootchart", "Frequency", config_parse_double, 0, &hz },
116 { "Bootchart", "Relative", config_parse_bool, 0, &relative },
117 { "Bootchart", "Filter", config_parse_bool, 0, &filter },
118 { "Bootchart", "Output", config_parse_path, 0, &output },
119 { "Bootchart", "Init", config_parse_path, 0, &init },
120 { "Bootchart", "PlotMemoryUsage", config_parse_bool, 0, &pss },
121 { "Bootchart", "PlotEntropyGraph", config_parse_bool, 0, &entropy },
122 { "Bootchart", "ScaleX", config_parse_double, 0, &scale_x },
123 { "Bootchart", "ScaleY", config_parse_double, 0, &scale_y },
124 { NULL, NULL, NULL, 0, NULL }
127 rlim.rlim_cur = 4096;
128 rlim.rlim_max = 4096;
129 (void) setrlimit(RLIMIT_NOFILE, &rlim);
131 fn = "/etc/systemd/bootchart.conf";
134 r = config_parse(fn, f, NULL, config_item_table_lookup, (void*) items, true, NULL);
136 log_warning("Failed to parse configuration file: %s", strerror(-r));
139 strscpy(init_path, sizeof(init_path), init);
141 strscpy(output_path, sizeof(output_path), output);
145 static struct option opts[] = {
146 {"rel", no_argument, NULL, 'r'},
147 {"freq", required_argument, NULL, 'f'},
148 {"samples", required_argument, NULL, 'n'},
149 {"pss", no_argument, NULL, 'p'},
150 {"output", required_argument, NULL, 'o'},
151 {"init", required_argument, NULL, 'i'},
152 {"filter", no_argument, NULL, 'F'},
153 {"help", no_argument, NULL, 'h'},
154 {"scale-x", required_argument, NULL, 'x'},
155 {"scale-y", required_argument, NULL, 'y'},
156 {"entropy", no_argument, NULL, 'e'},
162 i = getopt_long(argc, argv, "erpf:n:o:i:Fhx:y:", opts, &gind);
170 safe_atod(optarg, &hz);
176 safe_atoi(optarg, &len);
179 path_kill_slashes(optarg);
180 strscpy(output_path, sizeof(output_path), optarg);
183 path_kill_slashes(optarg);
184 strscpy(init_path, sizeof(init_path), optarg);
190 safe_atod(optarg, &scale_x);
193 safe_atod(optarg, &scale_y);
199 fprintf(stderr, "Usage: %s [OPTIONS]\n", argv[0]);
200 fprintf(stderr, " --rel, -r Record time relative to recording\n");
201 fprintf(stderr, " --freq, -f N Sample frequency [%f]\n", hz);
202 fprintf(stderr, " --samples, -n N Stop sampling at [%d] samples\n", len);
203 fprintf(stderr, " --scale-x, -x N Scale the graph horizontally [%f] \n", scale_x);
204 fprintf(stderr, " --scale-y, -y N Scale the graph vertically [%f] \n", scale_y);
205 fprintf(stderr, " --pss, -p Enable PSS graph (CPU intensive)\n");
206 fprintf(stderr, " --entropy, -e Enable the entropy_avail graph\n");
207 fprintf(stderr, " --output, -o [PATH] Path to output files [%s]\n", output_path);
208 fprintf(stderr, " --init, -i [PATH] Path to init executable [%s]\n", init_path);
209 fprintf(stderr, " --filter, -F Disable filtering of processes from the graph\n");
210 fprintf(stderr, " that are of less importance or short-lived\n");
211 fprintf(stderr, " --help, -h Display this message\n");
212 fprintf(stderr, "See the installed README and bootchartd.conf.example for more information.\n");
220 if (len > MAXSAMPLES) {
221 fprintf(stderr, "Error: samples exceeds maximum\n");
226 fprintf(stderr, "Error: Frequency needs to be > 0\n");
231 * If the kernel executed us through init=/sbin/bootchartd, then
233 * - parent execs executable specified via init_path[] (/sbin/init by default) as pid=1
239 execl(init_path, init_path, NULL);
244 /* start with empty ps LL */
245 ps_first = calloc(1, sizeof(struct ps_struct));
247 perror("calloc(ps_struct)");
251 /* handle TERM/INT nicely */
252 memset(&sig, 0, sizeof(struct sigaction));
253 sig.sa_handler = signal_handler;
254 sigaction(SIGHUP, &sig, NULL);
256 interval = (1.0 / hz) * 1000000000.0;
260 /* main program loop */
270 sampletime[samples] = gettime_ns();
272 if (!of && (access(output_path, R_OK|W_OK|X_OK) == 0)) {
274 strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
275 snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", output_path, datestr);
276 of = fopen(output_file, "w");
280 sysfd = open("/sys", O_RDONLY);
284 parse_env_file("/etc/os-release", NEWLINE,
285 "PRETTY_NAME", &build,
289 /* wait for /proc to become available, discarding samples */
290 if (!(graph_start > 0.0))
295 sample_stop = gettime_ns();
297 elapsed = (sample_stop - sampletime[samples]) * 1000000000.0;
298 timeleft = interval - elapsed;
300 newint_s = (time_t)(timeleft / 1000000000.0);
301 newint_ns = (long)(timeleft - (newint_s * 1000000000.0));
304 * check if we have not consumed our entire timeslice. If we
305 * do, don't sleep and take a new sample right away.
306 * we'll lose all the missed samples and overrun our total
309 if ((newint_ns > 0) || (newint_s > 0)) {
310 req.tv_sec = newint_s;
311 req.tv_nsec = newint_ns;
313 res = nanosleep(&req, NULL);
315 if (errno == EINTR) {
316 /* caught signal, probably HUP! */
319 perror("nanosleep()");
324 /* calculate how many samples we lost and scrap them */
325 len = len + ((int)(newint_ns / interval));
335 /* do some cleanup, close fd's */
337 while (ps->next_ps) {
340 close(ps->schedstat);
349 strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
350 snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", output_path, datestr);
351 of = fopen(output_file, "w");
355 perror("open output_file");
361 fprintf(stderr, "bootchartd: Wrote %s\n", output_file);
367 /* nitpic cleanups */
369 while (ps->next_ps) {
370 struct ps_struct *old = ps;
378 /* don't complain when overrun once, happens most commonly on 1st sample */
380 fprintf(stderr, "bootchartd: Warning: sample time overrun %i times\n", overrun);