src/bootchart/bootchart.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright (C) 2009-2013 Intel Corporation
   7
   8   Authors:
   9     Auke Kok <auke-jan.h.kok@intel.com>
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23  ***/
  24
  25 /***
  26
  27   Many thanks to those who contributed ideas and code:
  28   - Ziga Mahkovec - Original bootchart author
  29   - Anders Norgaard - PyBootchartgui
  30   - Michael Meeks - bootchart2
  31   - Scott James Remnant - Ubuntu C-based logger
  32   - Arjan van der Ven - for the idea to merge bootgraph.pl functionality
  33
  34  ***/
  35
  36 #include <sys/resource.h>
  37 #include <stdio.h>
  38 #include <signal.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42 #include <time.h>
  43 #include <getopt.h>
  44 #include <limits.h>
  45 #include <errno.h>
  46 #include <fcntl.h>
  47 #include <stdbool.h>
  48 #include "systemd/sd-journal.h"
  49
  50 #include "util.h"
  51 #include "fileio.h"
  52 #include "macro.h"
  53 #include "conf-parser.h"
  54 #include "strxcpyx.h"
  55 #include "path-util.h"
  56 #include "store.h"
  57 #include "svg.h"
  58 #include "bootchart.h"
  59 #include "list.h"
  60
  61 static int exiting = 0;
  62
  63 #define DEFAULT_SAMPLES_LEN 500
  64 #define DEFAULT_HZ 25.0
  65 #define DEFAULT_SCALE_X 100.0 /* 100px = 1sec */
  66 #define DEFAULT_SCALE_Y 20.0  /* 16px = 1 process bar */
  67 #define DEFAULT_INIT ROOTLIBEXECDIR "/systemd"
  68 #define DEFAULT_OUTPUT "/run/log"
  69
  70 /* graph defaults */
  71 bool arg_entropy = false;
  72 bool arg_initcall = true;
  73 bool arg_relative = false;
  74 bool arg_filter = true;
  75 bool arg_show_cmdline = false;
  76 bool arg_show_cgroup = false;
  77 bool arg_pss = false;
  78 bool arg_percpu = false;
  79 int arg_samples_len = DEFAULT_SAMPLES_LEN; /* we record len+1 (1 start sample) */
  80 double arg_hz = DEFAULT_HZ;
  81 double arg_scale_x = DEFAULT_SCALE_X;
  82 double arg_scale_y = DEFAULT_SCALE_Y;
  83
  84 char arg_init_path[PATH_MAX] = DEFAULT_INIT;
  85 char arg_output_path[PATH_MAX] = DEFAULT_OUTPUT;
  86
  87 static void signal_handler(int sig) {
  88         exiting = 1;
  89 }
  90
  91 #define BOOTCHART_CONF "/etc/systemd/bootchart.conf"
  92
  93 #define BOOTCHART_MAX (16*1024*1024)
  94
  95 static void parse_conf(void) {
  96         char *init = NULL, *output = NULL;
  97         const ConfigTableItem items[] = {
  98                 { "Bootchart", "Samples",          config_parse_int,    0, &arg_samples_len },
  99                 { "Bootchart", "Frequency",        config_parse_double, 0, &arg_hz          },
 100                 { "Bootchart", "Relative",         config_parse_bool,   0, &arg_relative    },
 101                 { "Bootchart", "Filter",           config_parse_bool,   0, &arg_filter      },
 102                 { "Bootchart", "Output",           config_parse_path,   0, &output          },
 103                 { "Bootchart", "Init",             config_parse_path,   0, &init            },
 104                 { "Bootchart", "PlotMemoryUsage",  config_parse_bool,   0, &arg_pss         },
 105                 { "Bootchart", "PlotEntropyGraph", config_parse_bool,   0, &arg_entropy     },
 106                 { "Bootchart", "ScaleX",           config_parse_double, 0, &arg_scale_x     },
 107                 { "Bootchart", "ScaleY",           config_parse_double, 0, &arg_scale_y     },
 108                 { "Bootchart", "ControlGroup",     config_parse_bool,   0, &arg_show_cgroup },
 109                 { "Bootchart", "PerCPU",           config_parse_bool,   0, &arg_percpu      },
 110                 { NULL, NULL, NULL, 0, NULL }
 111         };
 112
 113         config_parse_many(BOOTCHART_CONF,
 114                           CONF_DIRS_NULSTR("systemd/bootchart.conf"),
 115                           NULL, config_item_table_lookup, items, true, NULL);
 116
 117         if (init != NULL)
 118                 strscpy(arg_init_path, sizeof(arg_init_path), init);
 119         if (output != NULL)
 120                 strscpy(arg_output_path, sizeof(arg_output_path), output);
 121 }
 122
 123 static void help(void) {
 124         printf("Usage: %s [OPTIONS]\n\n"
 125                "Options:\n"
 126                "  -r --rel             Record time relative to recording\n"
 127                "  -f --freq=FREQ       Sample frequency [%g]\n"
 128                "  -n --samples=N       Stop sampling at [%d] samples\n"
 129                "  -x --scale-x=N       Scale the graph horizontally [%g] \n"
 130                "  -y --scale-y=N       Scale the graph vertically [%g] \n"
 131                "  -p --pss             Enable PSS graph (CPU intensive)\n"
 132                "  -e --entropy         Enable the entropy_avail graph\n"
 133                "  -o --output=PATH     Path to output files [%s]\n"
 134                "  -i --init=PATH       Path to init executable [%s]\n"
 135                "  -F --no-filter       Disable filtering of unimportant or ephemeral processes\n"
 136                "  -C --cmdline         Display full command lines with arguments\n"
 137                "  -c --control-group   Display process control group\n"
 138                "     --per-cpu         Draw each CPU utilization and wait bar also\n"
 139                "  -h --help            Display this message\n\n"
 140                "See bootchart.conf for more information.\n",
 141                program_invocation_short_name,
 142                DEFAULT_HZ,
 143                DEFAULT_SAMPLES_LEN,
 144                DEFAULT_SCALE_X,
 145                DEFAULT_SCALE_Y,
 146                DEFAULT_OUTPUT,
 147                DEFAULT_INIT);
 148 }
 149
 150 static int parse_argv(int argc, char *argv[]) {
 151
 152         enum {
 153                 ARG_PERCPU = 0x100,
 154         };
 155
 156         static const struct option options[] = {
 157                 {"rel",           no_argument,        NULL,  'r'       },
 158                 {"freq",          required_argument,  NULL,  'f'       },
 159                 {"samples",       required_argument,  NULL,  'n'       },
 160                 {"pss",           no_argument,        NULL,  'p'       },
 161                 {"output",        required_argument,  NULL,  'o'       },
 162                 {"init",          required_argument,  NULL,  'i'       },
 163                 {"no-filter",     no_argument,        NULL,  'F'       },
 164                 {"cmdline",       no_argument,        NULL,  'C'       },
 165                 {"control-group", no_argument,        NULL,  'c'       },
 166                 {"help",          no_argument,        NULL,  'h'       },
 167                 {"scale-x",       required_argument,  NULL,  'x'       },
 168                 {"scale-y",       required_argument,  NULL,  'y'       },
 169                 {"entropy",       no_argument,        NULL,  'e'       },
 170                 {"per-cpu",       no_argument,        NULL,  ARG_PERCPU},
 171                 {}
 172         };
 173         int c, r;
 174
 175         if (getpid() == 1)
 176                 opterr = 0;
 177
 178         while ((c = getopt_long(argc, argv, "erpf:n:o:i:FCchx:y:", options, NULL)) >= 0)
 179                 switch (c) {
 180
 181                 case 'r':
 182                         arg_relative = true;
 183                         break;
 184                 case 'f':
 185                         r = safe_atod(optarg, &arg_hz);
 186                         if (r < 0)
 187                                 log_warning_errno(r, "failed to parse --freq/-f argument '%s': %m",
 188                                                   optarg);
 189                         break;
 190                 case 'F':
 191                         arg_filter = false;
 192                         break;
 193                 case 'C':
 194                         arg_show_cmdline = true;
 195                         break;
 196                 case 'c':
 197                         arg_show_cgroup = true;
 198                         break;
 199                 case 'n':
 200                         r = safe_atoi(optarg, &arg_samples_len);
 201                         if (r < 0)
 202                                 log_warning_errno(r, "failed to parse --samples/-n argument '%s': %m",
 203                                                   optarg);
 204                         break;
 205                 case 'o':
 206                         path_kill_slashes(optarg);
 207                         strscpy(arg_output_path, sizeof(arg_output_path), optarg);
 208                         break;
 209                 case 'i':
 210                         path_kill_slashes(optarg);
 211                         strscpy(arg_init_path, sizeof(arg_init_path), optarg);
 212                         break;
 213                 case 'p':
 214                         arg_pss = true;
 215                         break;
 216                 case 'x':
 217                         r = safe_atod(optarg, &arg_scale_x);
 218                         if (r < 0)
 219                                 log_warning_errno(r, "failed to parse --scale-x/-x argument '%s': %m",
 220                                                   optarg);
 221                         break;
 222                 case 'y':
 223                         r = safe_atod(optarg, &arg_scale_y);
 224                         if (r < 0)
 225                                 log_warning_errno(r, "failed to parse --scale-y/-y argument '%s': %m",
 226                                                   optarg);
 227                         break;
 228                 case 'e':
 229                         arg_entropy = true;
 230                         break;
 231                 case ARG_PERCPU:
 232                         arg_percpu = true;
 233                         break;
 234                 case 'h':
 235                         help();
 236                         return 0;
 237                 case '?':
 238                         if (getpid() != 1)
 239                                 return -EINVAL;
 240                         else
 241                                 return 0;
 242                 default:
 243                         assert_not_reached("Unhandled option code.");
 244                 }
 245
 246         if (arg_hz <= 0) {
 247                 log_error("Frequency needs to be > 0");
 248                 return -EINVAL;
 249         }
 250
 251         return 1;
 252 }
 253
 254 static int do_journal_append(char *file) {
 255         _cleanup_free_ char *bootchart_message = NULL;
 256         _cleanup_free_ char *bootchart_file = NULL;
 257         _cleanup_free_ char *p = NULL;
 258         _cleanup_close_ int fd = -1;
 259         struct iovec iovec[5];
 260         int r, j = 0;
 261         ssize_t n;
 262
 263         bootchart_file = strappend("BOOTCHART_FILE=", file);
 264         if (!bootchart_file)
 265                 return log_oom();
 266
 267         IOVEC_SET_STRING(iovec[j++], bootchart_file);
 268         IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=9f26aa562cf440c2b16c773d0479b518");
 269         IOVEC_SET_STRING(iovec[j++], "PRIORITY=7");
 270         bootchart_message = strjoin("MESSAGE=Bootchart created: ", file, NULL);
 271         if (!bootchart_message)
 272                 return log_oom();
 273
 274         IOVEC_SET_STRING(iovec[j++], bootchart_message);
 275
 276         p = malloc(10 + BOOTCHART_MAX);
 277         if (!p)
 278                 return log_oom();
 279
 280         memcpy(p, "BOOTCHART=", 10);
 281
 282         fd = open(file, O_RDONLY|O_CLOEXEC);
 283         if (fd < 0)
 284                 return log_error_errno(errno, "Failed to open bootchart data \"%s\": %m", file);
 285
 286         n = loop_read(fd, p + 10, BOOTCHART_MAX, false);
 287         if (n < 0)
 288                 return log_error_errno(n, "Failed to read bootchart data: %m");
 289
 290         iovec[j].iov_base = p;
 291         iovec[j].iov_len = 10 + n;
 292         j++;
 293
 294         r = sd_journal_sendv(iovec, j);
 295         if (r < 0)
 296                 log_error_errno(r, "Failed to send bootchart: %m");
 297
 298         return 0;
 299 }
 300
 301 int main(int argc, char *argv[]) {
 302         static struct list_sample_data *sampledata;
 303         _cleanup_closedir_ DIR *proc = NULL;
 304         _cleanup_free_ char *build = NULL;
 305         _cleanup_fclose_ FILE *of = NULL;
 306         _cleanup_close_ int sysfd = -1;
 307         struct ps_struct *ps_first;
 308         double graph_start;
 309         double log_start;
 310         double interval;
 311         char output_file[PATH_MAX];
 312         char datestr[200];
 313         int pscount = 0;
 314         int n_cpus = 0;
 315         int overrun = 0;
 316         time_t t = 0;
 317         int r, samples;
 318         struct ps_struct *ps;
 319         struct rlimit rlim;
 320         struct list_sample_data *head;
 321         struct sigaction sig = {
 322                 .sa_handler = signal_handler,
 323         };
 324
 325         parse_conf();
 326
 327         r = parse_argv(argc, argv);
 328         if (r < 0)
 329                 return EXIT_FAILURE;
 330
 331         if (r == 0)
 332                 return EXIT_SUCCESS;
 333
 334         /*
 335          * If the kernel executed us through init=/usr/lib/systemd/systemd-bootchart, then
 336          * fork:
 337          * - parent execs executable specified via init_path[] (/usr/lib/systemd/systemd by default) as pid=1
 338          * - child logs data
 339          */
 340         if (getpid() == 1) {
 341                 if (fork()) {
 342                         /* parent */
 343                         execl(arg_init_path, arg_init_path, NULL);
 344                 }
 345         }
 346         argv[0][0] = '@';
 347
 348         rlim.rlim_cur = 4096;
 349         rlim.rlim_max = 4096;
 350         (void) setrlimit(RLIMIT_NOFILE, &rlim);
 351
 352         /* start with empty ps LL */
 353         ps_first = new0(struct ps_struct, 1);
 354         if (!ps_first) {
 355                 log_oom();
 356                 return EXIT_FAILURE;
 357         }
 358
 359         /* handle TERM/INT nicely */
 360         sigaction(SIGHUP, &sig, NULL);
 361
 362         interval = (1.0 / arg_hz) * 1000000000.0;
 363
 364         if (arg_relative)
 365                 graph_start = log_start = gettime_ns();
 366         else {
 367                 struct timespec n;
 368                 double uptime;
 369
 370                 clock_gettime(CLOCK_BOOTTIME, &n);
 371                 uptime = (n.tv_sec + (n.tv_nsec / (double) NSEC_PER_SEC));
 372
 373                 log_start = gettime_ns();
 374                 graph_start = log_start - uptime;
 375         }
 376
 377         if (graph_start < 0.0) {
 378                 log_error("Failed to setup graph start time.\n\n"
 379                           "The system uptime probably includes time that the system was suspended. "
 380                           "Use --rel to bypass this issue.");
 381                 return EXIT_FAILURE;
 382         }
 383
 384         LIST_HEAD_INIT(head);
 385
 386         /* main program loop */
 387         for (samples = 0; !exiting && samples < arg_samples_len; samples++) {
 388                 int res;
 389                 double sample_stop;
 390                 double elapsed;
 391                 double timeleft;
 392
 393                 sampledata = new0(struct list_sample_data, 1);
 394                 if (sampledata == NULL) {
 395                         log_oom();
 396                         return EXIT_FAILURE;
 397                 }
 398
 399                 sampledata->sampletime = gettime_ns();
 400                 sampledata->counter = samples;
 401
 402                 if (sysfd < 0)
 403                         sysfd = open("/sys", O_RDONLY|O_CLOEXEC);
 404
 405                 if (!build) {
 406                         if (parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &build, NULL) == -ENOENT)
 407                                 parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &build, NULL);
 408                 }
 409
 410                 if (proc)
 411                         rewinddir(proc);
 412                 else
 413                         proc = opendir("/proc");
 414
 415                 /* wait for /proc to become available, discarding samples */
 416                 if (proc) {
 417                         r = log_sample(proc, samples, ps_first, &sampledata, &pscount, &n_cpus);
 418                         if (r < 0)
 419                                 return EXIT_FAILURE;
 420                 }
 421
 422                 sample_stop = gettime_ns();
 423
 424                 elapsed = (sample_stop - sampledata->sampletime) * 1000000000.0;
 425                 timeleft = interval - elapsed;
 426
 427                 /*
 428                  * check if we have not consumed our entire timeslice. If we
 429                  * do, don't sleep and take a new sample right away.
 430                  * we'll lose all the missed samples and overrun our total
 431                  * time
 432                  */
 433                 if (timeleft > 0) {
 434                         struct timespec req;
 435
 436                         req.tv_sec = (time_t)(timeleft / 1000000000.0);
 437                         req.tv_nsec = (long)(timeleft - (req.tv_sec * 1000000000.0));
 438
 439                         res = nanosleep(&req, NULL);
 440                         if (res) {
 441                                 if (errno == EINTR) {
 442                                         /* caught signal, probably HUP! */
 443                                         break;
 444                                 }
 445                                 log_error_errno(errno, "nanosleep() failed: %m");
 446                                 return EXIT_FAILURE;
 447                         }
 448                 } else {
 449                         overrun++;
 450                         /* calculate how many samples we lost and scrap them */
 451                         arg_samples_len -= (int)(-timeleft / interval);
 452                 }
 453                 LIST_PREPEND(link, head, sampledata);
 454         }
 455
 456         /* do some cleanup, close fd's */
 457         ps = ps_first;
 458         while (ps->next_ps) {
 459                 ps = ps->next_ps;
 460                 ps->schedstat = safe_close(ps->schedstat);
 461                 ps->sched = safe_close(ps->sched);
 462                 if (ps->smaps) {
 463                         fclose(ps->smaps);
 464                         ps->smaps = NULL;
 465                 }
 466         }
 467
 468         if (!of) {
 469                 t = time(NULL);
 470                 r = strftime(datestr, sizeof(datestr), "%Y%m%d-%H%M", localtime(&t));
 471                 assert_se(r > 0);
 472
 473                 snprintf(output_file, PATH_MAX, "%s/bootchart-%s.svg", arg_output_path, datestr);
 474                 of = fopen(output_file, "we");
 475         }
 476
 477         if (!of) {
 478                 log_error("Error opening output file '%s': %m\n", output_file);
 479                 return EXIT_FAILURE;
 480         }
 481
 482         r = svg_do(of, strna(build), head, ps_first,
 483                    samples, pscount, n_cpus, graph_start,
 484                    log_start, interval, overrun);
 485
 486         if (r < 0) {
 487                 log_error_errno(r, "Error generating svg file: %m");
 488                 return EXIT_FAILURE;
 489         }
 490
 491         log_info("systemd-bootchart wrote %s\n", output_file);
 492
 493         r = do_journal_append(output_file);
 494         if (r < 0)
 495                 return EXIT_FAILURE;
 496
 497         /* nitpic cleanups */
 498         ps = ps_first->next_ps;
 499         while (ps->next_ps) {
 500                 struct ps_struct *old;
 501
 502                 old = ps;
 503                 old->sample = ps->first;
 504                 ps = ps->next_ps;
 505                 while (old->sample->next) {
 506                         struct ps_sched_struct *oldsample = old->sample;
 507
 508                         old->sample = old->sample->next;
 509                         free(oldsample);
 510                 }
 511                 free(old->cgroup);
 512                 free(old->sample);
 513                 free(old);
 514         }
 515
 516         free(ps->cgroup);
 517         free(ps->sample);
 518         free(ps);
 519
 520         sampledata = head;
 521         while (sampledata->link_prev) {
 522                 struct list_sample_data *old_sampledata = sampledata;
 523                 sampledata = sampledata->link_prev;
 524                 free(old_sampledata);
 525         }
 526         free(sampledata);
 527
 528         /* don't complain when overrun once, happens most commonly on 1st sample */
 529         if (overrun > 1)
 530                 log_warning("systemd-bootchart: sample time overrun %i times\n", overrun);
 531
 532         return 0;
 533 }