iowatcher/main.c

   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 <math.h>
  33 #include <getopt.h>
  34
  35 #include "plot.h"
  36 #include "blkparse.h"
  37 #include "list.h"
  38 #include "tracers.h"
  39 #include "mpstat.h"
  40
  41 LIST_HEAD(all_traces);
  42
  43 static char line[1024];
  44 static int line_len = 1024;
  45 static int found_mpstat = 0;
  46 static int cpu_color_index = 0;
  47 static int color_index = 0;
  48 static int make_movie = 0;
  49 static int opt_graph_width = 0;
  50 static int opt_graph_height = 0;
  51
  52 char *colors[] = {
  53         "blue", "darkgreen",
  54         "red", "aqua",
  55         "orange", "darkviolet",
  56         "brown", "#00FF00",
  57         "yellow", "coral",
  58         "black", "darkred",
  59         "fuchsia", "crimson",
  60         NULL };
  61
  62 char *pick_color(void) {
  63         char *ret = colors[color_index];
  64         if (!ret) {
  65                 color_index = 0;
  66                 ret = colors[color_index];
  67         }
  68         color_index++;
  69         return ret;
  70 }
  71
  72 char *pick_cpu_color(void) {
  73         char *ret = colors[cpu_color_index];
  74         if (!ret) {
  75                 color_index = 0;
  76                 ret = colors[cpu_color_index];
  77         }
  78         cpu_color_index++;
  79         return ret;
  80 }
  81
  82 enum {
  83         IO_GRAPH_INDEX = 0,
  84         TPUT_GRAPH_INDEX,
  85         CPU_SYS_GRAPH_INDEX,
  86         CPU_IO_GRAPH_INDEX,
  87         CPU_IRQ_GRAPH_INDEX,
  88         CPU_SOFT_GRAPH_INDEX,
  89         CPU_USER_GRAPH_INDEX,
  90         LATENCY_GRAPH_INDEX,
  91         QUEUE_DEPTH_GRAPH_INDEX,
  92         IOPS_GRAPH_INDEX,
  93         TOTAL_GRAPHS
  94 };
  95
  96 enum {
  97         MPSTAT_SYS = 0,
  98         MPSTAT_IRQ,
  99         MPSTAT_IO,
 100         MPSTAT_SOFT,
 101         MPSTAT_USER,
 102         MPSTAT_GRAPHS
 103 };
 104
 105 static char *graphs_by_name[] = {
 106         "io",
 107         "tput",
 108         "cpu-sys",
 109         "cpu-io",
 110         "cpu-irq",
 111         "cpu-soft",
 112         "cpu-user",
 113         "latency",
 114         "queue-depth",
 115         "iops",
 116 };
 117
 118 static int active_graphs[TOTAL_GRAPHS];
 119 static int last_active_graph = IOPS_GRAPH_INDEX;
 120
 121 static int label_index = 0;
 122 static int num_traces = 0;
 123 static int longest_label = 0;
 124
 125 struct trace_file {
 126         struct list_head list;
 127         char *filename;
 128         char *label;
 129         struct trace *trace;
 130         int seconds;
 131         int stop_seconds;
 132         u64 max_offset;
 133
 134         char *read_color;
 135         char *write_color;
 136
 137         struct graph_line_data *tput_gld;
 138         struct graph_line_data *iop_gld;
 139         struct graph_line_data *latency_gld;
 140         struct graph_line_data *queue_depth_gld;
 141         struct graph_dot_data *gdd_writes;
 142         struct graph_dot_data *gdd_reads;
 143
 144         int mpstat_seconds;
 145         int mpstat_stop_seconds;
 146         struct graph_line_data **mpstat_gld;
 147 };
 148
 149 static void alloc_mpstat_gld(struct trace_file *tf)
 150 {
 151         struct graph_line_data **ptr;
 152
 153         if (tf->trace->mpstat_num_cpus == 0)
 154                 return;
 155
 156         ptr = calloc((tf->trace->mpstat_num_cpus + 1) * MPSTAT_GRAPHS,
 157                      sizeof(struct graph_line_data *));
 158         if (!ptr) {
 159                 perror("Unable to allocate mpstat arrays\n");
 160                 exit(1);
 161         }
 162         tf->mpstat_gld = ptr;
 163 }
 164
 165 static void enable_all_graphs(void)
 166 {
 167         int i;
 168         for (i = 0; i < TOTAL_GRAPHS; i++)
 169                 active_graphs[i] = 1;
 170 }
 171
 172 static void disable_all_graphs(void)
 173 {
 174         int i;
 175         for (i = 0; i < TOTAL_GRAPHS; i++)
 176                 active_graphs[i] = 0;
 177 }
 178
 179 static int enable_one_graph(char *name)
 180 {
 181         int i;
 182         for (i = 0; i < TOTAL_GRAPHS; i++) {
 183                 if (strcmp(name, graphs_by_name[i]) == 0) {
 184                         active_graphs[i] = 1;
 185                         return 0;
 186                 }
 187         }
 188         return -ENOENT;
 189 }
 190
 191 static int disable_one_graph(char *name)
 192 {
 193         int i;
 194         for (i = 0; i < TOTAL_GRAPHS; i++) {
 195                 if (strcmp(name, graphs_by_name[i]) == 0) {
 196                         active_graphs[i] = 0;
 197                         return 0;
 198                 }
 199         }
 200         return -ENOENT;
 201 }
 202
 203 static int last_graph(void)
 204 {
 205         int i;
 206         for (i = TOTAL_GRAPHS - 1; i >= 0; i--) {
 207                 if (active_graphs[i]) {
 208                         return i;
 209                 }
 210         }
 211         return -ENOENT;
 212 }
 213 static void add_trace_file(char *filename)
 214 {
 215         struct trace_file *tf;
 216
 217         tf = calloc(1, sizeof(*tf));
 218         if (!tf) {
 219                 fprintf(stderr, "Unable to allocate memory\n");
 220                 exit(1);
 221         }
 222         tf->label = "";
 223         tf->filename = strdup(filename);
 224         list_add_tail(&tf->list, &all_traces);
 225         tf->read_color = pick_color();
 226         tf->write_color = pick_color();
 227         num_traces++;
 228 }
 229
 230 static void setup_trace_file_graphs(void)
 231 {
 232         struct trace_file *tf;
 233         int i;
 234
 235         list_for_each_entry(tf, &all_traces, list) {
 236                 tf->tput_gld = alloc_line_data(tf->seconds, tf->stop_seconds);
 237                 tf->latency_gld = alloc_line_data(tf->seconds, tf->stop_seconds);
 238                 tf->queue_depth_gld = alloc_line_data(tf->seconds, tf->stop_seconds);
 239                 tf->iop_gld = alloc_line_data(tf->seconds, tf->stop_seconds);
 240                 tf->gdd_writes = alloc_dot_data(tf->seconds, tf->max_offset, tf->stop_seconds);
 241                 tf->gdd_reads = alloc_dot_data(tf->seconds, tf->max_offset, tf->stop_seconds);
 242
 243                 if (tf->trace->mpstat_num_cpus == 0)
 244                         continue;
 245
 246                 alloc_mpstat_gld(tf);
 247                 for (i = 0; i < (tf->trace->mpstat_num_cpus + 1) * MPSTAT_GRAPHS; i++) {
 248                         tf->mpstat_gld[i] =
 249                                 alloc_line_data(tf->mpstat_seconds,
 250                                                 tf->mpstat_seconds);
 251                         tf->mpstat_gld[i]->max = 100;
 252                 }
 253         }
 254 }
 255
 256 static void read_traces(void)
 257 {
 258         struct trace_file *tf;
 259         struct trace *trace;
 260         u64 last_time;
 261         u64 ymin;
 262         u64 ymax;
 263
 264         list_for_each_entry(tf, &all_traces, list) {
 265                 trace = open_trace(tf->filename);
 266                 if (!trace)
 267                         exit(1);
 268
 269                 last_time = find_last_time(trace);
 270                 tf->trace = trace;
 271                 tf->seconds = SECONDS(last_time);
 272                 tf->stop_seconds = SECONDS(last_time);
 273                 tf->max_offset = find_highest_offset(trace);
 274
 275                 filter_outliers(trace, tf->max_offset, &ymin, &ymax);
 276                 tf->max_offset = ymax;
 277
 278                 read_mpstat(trace, tf->filename);
 279                 tf->mpstat_stop_seconds = trace->mpstat_seconds;
 280                 tf->mpstat_seconds = trace->mpstat_seconds;
 281                 if (tf->mpstat_seconds)
 282                         found_mpstat = 1;
 283         }
 284 }
 285
 286 static void read_trace_events(void)
 287 {
 288
 289         struct trace_file *tf;
 290         struct trace *trace;
 291         int ret;
 292         int i;
 293         int time;
 294         double user, sys, iowait, irq, soft;
 295         double max_user = 0, max_sys = 0, max_iowait = 0,
 296                max_irq = 0, max_soft = 0;
 297
 298         list_for_each_entry(tf, &all_traces, list) {
 299                 trace = tf->trace;
 300                 first_record(trace);
 301                 while (1) {
 302                         check_record(trace);
 303                         add_tput(trace, tf->tput_gld);
 304                         add_iop(trace, tf->iop_gld);
 305                         add_io(trace, tf->gdd_writes, tf->gdd_reads);
 306                         add_pending_io(trace, tf->queue_depth_gld);
 307                         add_completed_io(trace, tf->latency_gld);
 308                         ret = next_record(trace);
 309                         if (ret)
 310                                 break;
 311                 }
 312         }
 313         list_for_each_entry(tf, &all_traces, list) {
 314                 trace = tf->trace;
 315
 316                 if (trace->mpstat_num_cpus == 0)
 317                         continue;
 318
 319                 first_mpstat(trace);
 320
 321                 for (time = 0; time < tf->mpstat_stop_seconds; time ++) {
 322                         for (i = 0; i < (trace->mpstat_num_cpus + 1) * MPSTAT_GRAPHS; i += MPSTAT_GRAPHS) {
 323                                 ret = read_mpstat_event(trace, &user, &sys,
 324                                                         &iowait, &irq, &soft);
 325                                 if (ret)
 326                                         goto mpstat_done;
 327                                 if (next_mpstat_line(trace))
 328                                         goto mpstat_done;
 329
 330                                 if (sys > max_sys)
 331                                         max_sys = sys;
 332                                 if (user > max_user)
 333                                         max_user = user;
 334                                 if (irq > max_irq)
 335                                         max_irq = irq;
 336                                 if (iowait > max_iowait)
 337                                         max_iowait = iowait;
 338
 339                                 add_mpstat_gld(time, sys, tf->mpstat_gld[i + MPSTAT_SYS]);
 340                                 add_mpstat_gld(time, irq, tf->mpstat_gld[i + MPSTAT_IRQ]);
 341                                 add_mpstat_gld(time, soft, tf->mpstat_gld[i + MPSTAT_SOFT]);
 342                                 add_mpstat_gld(time, user, tf->mpstat_gld[i + MPSTAT_USER]);
 343                                 add_mpstat_gld(time, iowait, tf->mpstat_gld[i + MPSTAT_IO]);
 344                         }
 345                         if (next_mpstat(trace) == NULL)
 346                                 break;
 347                 }
 348         }
 349
 350 mpstat_done:
 351         list_for_each_entry(tf, &all_traces, list) {
 352                 trace = tf->trace;
 353
 354                 if (trace->mpstat_num_cpus == 0)
 355                         continue;
 356
 357                 tf->mpstat_gld[MPSTAT_SYS]->max = max_sys;
 358                 tf->mpstat_gld[MPSTAT_IRQ]->max = max_irq;
 359                 tf->mpstat_gld[MPSTAT_SOFT]->max = max_soft;
 360                 tf->mpstat_gld[MPSTAT_USER]->max = max_user;
 361                 tf->mpstat_gld[MPSTAT_IO]->max = max_iowait;;
 362         }
 363         return;
 364 }
 365
 366 static void set_trace_label(char *label)
 367 {
 368         int cur = 0;
 369         struct trace_file *tf;
 370         int len = strlen(label);
 371
 372         if (len > longest_label)
 373                 longest_label = len;
 374
 375         list_for_each_entry(tf, &all_traces, list) {
 376                 if (cur == label_index) {
 377                         tf->label = strdup(label);
 378                         label_index++;
 379                         break;
 380                 }
 381                 cur++;
 382         }
 383 }
 384
 385 static char *graph_title = "";
 386 static char *output_filename = "trace.svg";
 387 static char *blktrace_device = NULL;
 388 static char *blktrace_outfile = "trace";
 389 static char *blktrace_dest_dir = ".";
 390 static char *program_to_run = NULL;
 391
 392 static void set_blktrace_outfile(char *arg)
 393 {
 394         char *s = strdup(arg);
 395         char *last_dot = strrchr(s, '.');
 396
 397         if (last_dot) {
 398                 if (strcmp(last_dot, ".dump") == 0)
 399                         *last_dot = '\0';
 400         }
 401         blktrace_outfile = s;
 402 }
 403
 404
 405 static void compare_max_tf(struct trace_file *tf, int *seconds, u64 *max_offset)
 406 {
 407         if (tf->seconds > *seconds)
 408                 *seconds = tf->seconds;
 409         if (tf->max_offset > *max_offset)
 410                 *max_offset = tf->max_offset;
 411 }
 412
 413 static void set_all_max_tf(int seconds, u64 max_offset)
 414 {
 415         struct trace_file *tf;
 416
 417         list_for_each_entry(tf, &all_traces, list) {
 418                 tf->seconds = seconds;
 419                 tf->max_offset = max_offset;
 420         }
 421 }
 422
 423 static char *create_movie_temp_dir(void)
 424 {
 425         char *ret;
 426         char *pattern = strdup("btrfs-movie-XXXXXX");;
 427
 428         ret = mkdtemp(pattern);
 429         if (!ret) {
 430                 perror("Unable to create temp directory for movie files");
 431                 exit(1);
 432         }
 433         return ret;
 434 }
 435
 436 static struct plot_history *alloc_plot_history(char *color)
 437 {
 438         struct plot_history *ph = calloc(1, sizeof(struct plot_history));
 439
 440         if (!ph) {
 441                 perror("memory allocation failed");
 442                 exit(1);
 443         }
 444         ph->history = calloc(4096, sizeof(double));
 445         if (!ph->history) {
 446                 perror("memory allocation failed");
 447                 exit(1);
 448         }
 449         ph->history_len = 4096;
 450         ph->color = color;
 451         return ph;
 452 }
 453
 454 LIST_HEAD(movie_history_writes);
 455 LIST_HEAD(movie_history_reads);
 456 int num_histories = 0;
 457
 458 static void add_history(struct plot_history *ph, struct list_head *list)
 459 {
 460         struct plot_history *entry;
 461
 462         list_add_tail(&ph->list, list);
 463         num_histories++;
 464
 465         if (num_histories > 12) {
 466                 num_histories--;
 467                 entry = list_entry(list->next, struct plot_history, list);
 468                 list_del(&entry->list);
 469                 free(entry->history);
 470                 free(entry);
 471         }
 472 }
 473
 474 static void plot_movie_history(struct plot *plot, struct list_head *list)
 475 {
 476         float alpha = 0.1;
 477         struct plot_history *ph;
 478
 479         list_for_each_entry(ph, list, list) {
 480                 if (ph->list.next == list)
 481                         alpha = 1;
 482                 svg_io_graph_movie_array(plot, ph, 1);
 483                 alpha += 0.2;
 484                 if (alpha > 1)
 485                         alpha = 0.8;
 486          }
 487 }
 488
 489 static void free_all_plot_history(struct list_head *head)
 490 {
 491         struct plot_history *entry;
 492         while (!list_empty(head)) {
 493                 entry = list_entry(head->next, struct plot_history, list);
 494                 list_del(&entry->list);
 495                 free(entry->history);
 496                 free(entry);
 497         }
 498 }
 499
 500 static void __plot_io(struct plot *plot, int seconds, u64 max_offset)
 501 {
 502         struct trace_file *tf;
 503
 504         if (active_graphs[IO_GRAPH_INDEX] == 0)
 505                 return;
 506
 507         setup_axis(plot);
 508
 509         svg_alloc_legend(plot, num_traces * 2);
 510
 511         set_plot_label(plot, "Device IO");
 512         set_ylabel(plot, "Offset (MB)");
 513         set_yticks(plot, 4, 0, max_offset / (1024 * 1024), "");
 514         set_xticks(plot, 9, 0, seconds);
 515
 516         list_for_each_entry(tf, &all_traces, list) {
 517                 char *label = tf->label;
 518
 519                 if (!label)
 520                         label = "";
 521                 svg_io_graph(plot, tf->gdd_reads, tf->read_color);
 522                 if (tf->gdd_reads->total_ios)
 523                         svg_add_legend(plot, label, " Reads", tf->read_color);
 524
 525                 svg_io_graph(plot, tf->gdd_writes, tf->write_color);
 526                 if (tf->gdd_writes->total_ios) {
 527                         svg_add_legend(plot, label, " Writes", tf->write_color);
 528                 }
 529         }
 530         if (plot->add_xlabel)
 531                 set_xlabel(plot, "Time (seconds)");
 532         svg_write_legend(plot);
 533 }
 534
 535 static void plot_io(struct plot *plot, int seconds, u64 max_offset)
 536 {
 537         plot->add_xlabel = last_active_graph == IO_GRAPH_INDEX;
 538
 539         __plot_io(plot, seconds, max_offset);
 540         close_plot(plot);
 541 }
 542
 543 static void __plot_tput(struct plot *plot, int seconds)
 544 {
 545         struct trace_file *tf;
 546         char *units;
 547         char line[128];
 548         u64 max = 0;
 549
 550         if (active_graphs[TPUT_GRAPH_INDEX] == 0)
 551                 return;
 552
 553         if (num_traces > 1)
 554                 svg_alloc_legend(plot, num_traces);
 555         list_for_each_entry(tf, &all_traces, list) {
 556                 if (tf->tput_gld->max > max)
 557                         max = tf->tput_gld->max;
 558         }
 559         list_for_each_entry(tf, &all_traces, list)
 560                 tf->tput_gld->max = max;
 561
 562         setup_axis(plot);
 563         set_plot_label(plot, "Throughput");
 564
 565         tf = list_entry(all_traces.next, struct trace_file, list);
 566
 567         scale_line_graph_bytes(&max, &units, 1024);
 568         sprintf(line, "%sB/s", units);
 569         set_ylabel(plot, line);
 570         set_yticks(plot, 4, 0, max, "");
 571         set_xticks(plot, 9, 0, seconds);
 572
 573         list_for_each_entry(tf, &all_traces, list) {
 574                 svg_line_graph(plot, tf->tput_gld, tf->read_color);
 575                 if (num_traces > 1)
 576                         svg_add_legend(plot, tf->label, "", tf->read_color);
 577         }
 578
 579         if (plot->add_xlabel)
 580                 set_xlabel(plot, "Time (seconds)");
 581         if (num_traces > 1)
 582                 svg_write_legend(plot);
 583 }
 584
 585 static void plot_tput(struct plot *plot, int seconds)
 586 {
 587         plot->add_xlabel = last_active_graph == TPUT_GRAPH_INDEX;
 588         __plot_tput(plot, seconds);
 589         close_plot(plot);
 590 }
 591
 592 static void convert_movie_files(char *movie_dir)
 593 {
 594         fprintf(stderr, "Converting svg files in %s\n", movie_dir);
 595         snprintf(line, line_len, "find %s -name \\*.svg | xargs -I{} -n 1 -P 8 rsvg-convert -o {}.png {}",
 596                  movie_dir);
 597         system(line);
 598 }
 599
 600 static void mencode_movie(char *movie_dir)
 601 {
 602         fprintf(stderr, "Creating movie %s\n", movie_dir);
 603         snprintf(line, line_len, "mencoder mf://%s/*.png -mf type=png:fps=16 -of lavf "
 604                  "-ovc x264 -oac copy -o %s",
 605                  movie_dir, output_filename);
 606         system(line);
 607 }
 608
 609 static void cleanup_movie(char *movie_dir)
 610 {
 611         fprintf(stderr, "Removing movie dir %s\n", movie_dir);
 612         snprintf(line, line_len, "rm %s/*", movie_dir);
 613         system(line);
 614
 615         snprintf(line, line_len, "rmdir %s", movie_dir);
 616         system(line);
 617 }
 618
 619 static void plot_io_movie(struct plot *plot)
 620 {
 621         struct trace_file *tf;
 622         char *movie_dir = create_movie_temp_dir();
 623         int i;
 624         struct plot_history *read_history;
 625         struct plot_history *write_history;
 626         int batch_i;
 627         int movie_len = 30;
 628         int movie_frames_per_sec = 16;
 629         int total_frames = movie_len * movie_frames_per_sec;
 630         int rows, cols;
 631         int batch_count;
 632
 633         get_graph_size(&cols, &rows);
 634         batch_count = cols / total_frames;
 635
 636         if (batch_count == 0)
 637                 batch_count = 1;
 638
 639         list_for_each_entry(tf, &all_traces, list) {
 640                 char *label = tf->label;
 641                 if (!label)
 642                         label = "";
 643
 644                 i = 0;
 645                 while (i < cols) {
 646                         snprintf(line, line_len, "%s/%010d-%s.svg", movie_dir, i, output_filename);
 647                         set_plot_output(plot, line);
 648
 649                         set_plot_title(plot, graph_title);
 650                         setup_axis(plot);
 651                         svg_alloc_legend(plot, num_traces * 2);
 652
 653                         read_history = alloc_plot_history(tf->read_color);
 654                         write_history = alloc_plot_history(tf->write_color);
 655                         read_history->col = i;
 656                         write_history->col = i;
 657
 658                         if (tf->gdd_reads->total_ios)
 659                                 svg_add_legend(plot, label, " Reads", tf->read_color);
 660                         if (tf->gdd_writes->total_ios)
 661                                 svg_add_legend(plot, label, " Writes", tf->write_color);
 662
 663                         batch_i = 0;
 664                         while (i < cols && batch_i < batch_count) {
 665                                 /* print just this column */
 666                                 svg_io_graph_movie(tf->gdd_reads, read_history, i);
 667
 668                                 svg_io_graph_movie(tf->gdd_writes, write_history, i);
 669                                 i++;
 670                                 batch_i++;
 671                         }
 672
 673                         add_history(read_history, &movie_history_reads);
 674                         add_history(write_history, &movie_history_writes);
 675
 676                         plot_movie_history(plot, &movie_history_reads);
 677                         plot_movie_history(plot, &movie_history_writes);
 678
 679                         svg_write_legend(plot);
 680                         close_plot(plot);
 681
 682                         set_graph_size(cols, rows / 3);
 683                         plot->add_xlabel = 1;
 684                         __plot_tput(plot, tf->gdd_reads->seconds);
 685                         svg_write_time_line(plot, i);
 686                         close_plot(plot);
 687                         set_graph_size(cols, rows);
 688
 689                         close_plot(plot);
 690                 }
 691                 free_all_plot_history(&movie_history_reads);
 692                 free_all_plot_history(&movie_history_writes);
 693         }
 694         convert_movie_files(movie_dir);
 695         mencode_movie(movie_dir);
 696         cleanup_movie(movie_dir);
 697         free(movie_dir);
 698 }
 699
 700 static void plot_cpu(struct plot *plot, int seconds, char *label,
 701                      int active_index, int gld_index)
 702 {
 703         struct trace_file *tf;
 704         char line[128];
 705         int max = 0;
 706         int i;
 707         int gld_i;
 708         char *color;
 709         double avg = 0;
 710         int ymax;
 711         int plotted = 0;
 712
 713         if (active_graphs[active_index] == 0)
 714                 return;
 715
 716         list_for_each_entry(tf, &all_traces, list) {
 717                 if (tf->trace->mpstat_num_cpus > max)
 718                         max = tf->trace->mpstat_num_cpus;
 719         }
 720         if (max == 0)
 721                 return;
 722
 723         tf = list_entry(all_traces.next, struct trace_file, list);
 724
 725         ymax = tf->mpstat_gld[gld_index]->max;
 726         if (ymax == 0)
 727                 return;
 728
 729         svg_alloc_legend(plot, num_traces * max);
 730
 731         plot->add_xlabel = last_active_graph == active_index;
 732         setup_axis(plot);
 733         set_plot_label(plot, label);
 734
 735         seconds = tf->mpstat_seconds;
 736
 737         set_yticks(plot, 4, 0, tf->mpstat_gld[gld_index]->max, "");
 738         set_ylabel(plot, "Percent");
 739         set_xticks(plot, 9, 0, seconds);
 740
 741         cpu_color_index = 0;
 742         list_for_each_entry(tf, &all_traces, list) {
 743                 for (i = 0; i < tf->mpstat_gld[0]->stop_seconds; i++) {
 744                         avg += tf->mpstat_gld[gld_index]->data[i].sum;
 745                 }
 746                 avg /= tf->mpstat_gld[gld_index]->stop_seconds;
 747                 color = pick_cpu_color();
 748                 svg_line_graph(plot, tf->mpstat_gld[0], color);
 749                 svg_add_legend(plot, tf->label, " avg", color);
 750
 751                 for (i = 1; i < tf->trace->mpstat_num_cpus + 1; i++) {
 752                         struct graph_line_data *gld = tf->mpstat_gld[i * MPSTAT_GRAPHS + gld_index];
 753                         double this_avg = 0;
 754
 755                         for (gld_i = 0; gld_i < gld->stop_seconds; gld_i++)
 756                                 this_avg += gld->data[i].sum;
 757
 758                         this_avg /= gld->stop_seconds;
 759
 760                         for (gld_i = 0; gld_i < gld->stop_seconds; gld_i++) {
 761                                 if (this_avg > avg + 30 ||
 762                                     gld->data[gld_i].sum > 95) {
 763                                         color = pick_cpu_color();
 764                                         svg_line_graph(plot, gld, color);
 765                                         snprintf(line, 128, " CPU %d\n", i - 1);
 766                                         svg_add_legend(plot, tf->label, line, color);
 767                                         plotted++;
 768                                         break;
 769                                 }
 770
 771                         }
 772                 }
 773         }
 774
 775         if (plot->add_xlabel)
 776                 set_xlabel(plot, "Time (seconds)");
 777
 778         if (plot->legend_index <= 8)
 779                 svg_write_legend(plot);
 780         else
 781                 svg_free_legend(plot);
 782         close_plot(plot);
 783 }
 784
 785 static void plot_latency(struct plot *plot, int seconds)
 786 {
 787         struct trace_file *tf;
 788         char *units;
 789         char line[128];
 790         u64 max = 0;
 791
 792         if (active_graphs[LATENCY_GRAPH_INDEX] == 0)
 793                 return;
 794
 795         if (num_traces > 1)
 796                 svg_alloc_legend(plot, num_traces);
 797         list_for_each_entry(tf, &all_traces, list) {
 798                 if (tf->latency_gld->max > max)
 799                         max = tf->latency_gld->max;
 800         }
 801         list_for_each_entry(tf, &all_traces, list)
 802                 tf->latency_gld->max = max;
 803
 804         plot->add_xlabel = last_active_graph == TPUT_GRAPH_INDEX;
 805         setup_axis(plot);
 806         set_plot_label(plot, "IO Latency");
 807
 808         tf = list_entry(all_traces.next, struct trace_file, list);
 809
 810         scale_line_graph_time(&max, &units);
 811         sprintf(line, "latency (%ss)", units);
 812         set_ylabel(plot, line);
 813         set_yticks(plot, 4, 0, max, "");
 814         set_xticks(plot, 9, 0, seconds);
 815
 816         list_for_each_entry(tf, &all_traces, list) {
 817                 svg_line_graph(plot, tf->latency_gld, tf->read_color);
 818                 if (num_traces > 1)
 819                         svg_add_legend(plot, tf->label, "", tf->read_color);
 820         }
 821
 822         if (plot->add_xlabel)
 823                 set_xlabel(plot, "Time (seconds)");
 824         if (num_traces > 1)
 825                 svg_write_legend(plot);
 826         close_plot(plot);
 827 }
 828
 829 static void plot_queue_depth(struct plot *plot, int seconds)
 830 {
 831         struct trace_file *tf;
 832
 833         if (active_graphs[QUEUE_DEPTH_GRAPH_INDEX] == 0)
 834                 return;
 835
 836         plot->add_xlabel = last_active_graph == QUEUE_DEPTH_GRAPH_INDEX;
 837
 838         setup_axis(plot);
 839         set_plot_label(plot, "Queue Depth");
 840         if (num_traces > 1)
 841                 svg_alloc_legend(plot, num_traces);
 842
 843         tf = list_entry(all_traces.next, struct trace_file, list);
 844         set_ylabel(plot, "Pending IO");
 845         set_yticks(plot, 4, 0, tf->queue_depth_gld->max, "");
 846         set_xticks(plot, 9, 0, seconds);
 847
 848         list_for_each_entry(tf, &all_traces, list) {
 849                 svg_line_graph(plot, tf->queue_depth_gld, tf->read_color);
 850                 if (num_traces > 1)
 851                         svg_add_legend(plot, tf->label, "", tf->read_color);
 852         }
 853
 854         if (plot->add_xlabel)
 855                 set_xlabel(plot, "Time (seconds)");
 856         if (num_traces > 1)
 857                 svg_write_legend(plot);
 858         close_plot(plot);
 859 }
 860
 861 static void plot_iops(struct plot *plot, int seconds)
 862 {
 863         struct trace_file *tf;
 864         char *units;
 865         u64 max = 0;
 866
 867         if (active_graphs[IOPS_GRAPH_INDEX] == 0)
 868                 return;
 869
 870         list_for_each_entry(tf, &all_traces, list) {
 871                 if (tf->iop_gld->max > max)
 872                         max = tf->iop_gld->max;
 873         }
 874
 875         list_for_each_entry(tf, &all_traces, list)
 876                 tf->iop_gld->max = max;
 877
 878
 879         plot->add_xlabel = last_active_graph == IOPS_GRAPH_INDEX;
 880         setup_axis(plot);
 881         set_plot_label(plot, "IOPs");
 882         if (num_traces > 1)
 883                 svg_alloc_legend(plot, num_traces);
 884
 885         tf = list_entry(all_traces.next, struct trace_file, list);
 886
 887         scale_line_graph_bytes(&max, &units, 1000);
 888         set_ylabel(plot, "IO/s");
 889
 890         set_yticks(plot, 4, 0, max, units);
 891         set_xticks(plot, 9, 0, seconds);
 892
 893         list_for_each_entry(tf, &all_traces, list) {
 894                 svg_line_graph(plot, tf->iop_gld, tf->read_color);
 895                 if (num_traces > 1)
 896                         svg_add_legend(plot, tf->label, "", tf->read_color);
 897         }
 898
 899         if (plot->add_xlabel)
 900                 set_xlabel(plot, "Time (seconds)");
 901         if (num_traces > 1)
 902                 svg_write_legend(plot);
 903
 904         close_plot(plot);
 905 }
 906
 907 enum {
 908         HELP_LONG_OPT = 1,
 909 };
 910
 911 char *option_string = "T:t:o:l:r:O:N:d:p:mh:w:";
 912 static struct option long_options[] = {
 913         {"title", required_argument, 0, 'T'},
 914         {"trace", required_argument, 0, 't'},
 915         {"output", required_argument, 0, 'o'},
 916         {"label", required_argument, 0, 'l'},
 917         {"rolling", required_argument, 0, 'r'},
 918         {"no-graph", required_argument, 0, 'N'},
 919         {"only-graph", required_argument, 0, 'O'},
 920         {"device", required_argument, 0, 'd'},
 921         {"prog", required_argument, 0, 'p'},
 922         {"movie", no_argument, 0, 'm'},
 923         {"width", required_argument, 0, 'w'},
 924         {"height", required_argument, 0, 'h'},
 925         {"help", required_argument, 0, HELP_LONG_OPT},
 926         {0, 0, 0, 0}
 927 };
 928
 929 static void print_usage(void)
 930 {
 931         fprintf(stderr, "iowatcher usage:\n"
 932                 "\t-d (--device): device for blktrace to trace\n"
 933                 "\t-t (--trace): trace file name (more than one allowed)\n"
 934                 "\t-l (--label): trace label in the graph\n"
 935                 "\t-o (--output): output file name (SVG only)\n"
 936                 "\t-p (--prog): program to run while blktrace is run\n"
 937                 "\t-p (--movie): create IO animations\n"
 938                 "\t-r (--rolling): number of seconds in the rolling averge\n"
 939                 "\t-T (--title): graph title\n"
 940                 "\t-N (--no-graph): skip a single graph (io, tput, latency, queue_depth, iops)\n"
 941                 "\t-h (--height): set the height of each graph\n"
 942                 "\t-w (--width): set the width of each graph\n"
 943                );
 944         exit(1);
 945 }
 946
 947 static int parse_options(int ac, char **av)
 948 {
 949         int c;
 950         int disabled = 0;
 951
 952         while (1) {
 953                 // int this_option_optind = optind ? optind : 1;
 954                 int option_index = 0;
 955
 956                 c = getopt_long(ac, av, option_string,
 957                                 long_options, &option_index);
 958
 959                 if (c == -1)
 960                         break;
 961
 962                 switch(c) {
 963                 case 'T':
 964                         graph_title = strdup(optarg);
 965                         break;
 966                 case 't':
 967                         add_trace_file(optarg);
 968                         set_blktrace_outfile(optarg);
 969                         break;
 970                 case 'o':
 971                         output_filename = strdup(optarg);
 972                         break;
 973                 case 'l':
 974                         set_trace_label(optarg);
 975                         break;
 976                 case 'r':
 977                         set_rolling_avg(atoi(optarg));
 978                         break;
 979                 case 'O':
 980                         if (!disabled) {
 981                                 disable_all_graphs();
 982                                 disabled = 1;
 983                         }
 984                         enable_one_graph(optarg);
 985                         break;
 986                 case 'N':
 987                         disable_one_graph(optarg);
 988                         break;
 989                 case 'd':
 990                         blktrace_device = strdup(optarg);
 991                         break;
 992                 case 'p':
 993                         program_to_run = strdup(optarg);
 994                         break;
 995                 case 'm':
 996                         make_movie = 1;
 997                         break;
 998                 case 'h':
 999                         opt_graph_height = atoi(optarg);
1000                         break;
1001                 case 'w':
1002                         opt_graph_width = atoi(optarg);
1003                         break;
1004                 case '?':
1005                 case HELP_LONG_OPT:
1006                         print_usage();
1007                         break;
1008                 default:
1009                         break;
1010                 }
1011         }
1012         return 0;
1013 }
1014
1015
1016 int main(int ac, char **av)
1017 {
1018         struct plot *plot;
1019         int seconds = 0;
1020         u64 max_offset = 0;
1021         struct trace_file *tf;
1022         int ret;
1023
1024         init_io_hash_table();
1025
1026         enable_all_graphs();
1027
1028         parse_options(ac, av);
1029
1030         last_active_graph = last_graph();
1031         if (make_movie) {
1032                 set_io_graph_scale(256);
1033                 set_graph_size(700, 250);
1034         }
1035         if (opt_graph_height)
1036                 set_graph_height(opt_graph_height);
1037
1038         if (opt_graph_width)
1039                 set_graph_width(opt_graph_height);
1040
1041         if (list_empty(&all_traces)) {
1042                 fprintf(stderr, "No traces found, exiting\n");
1043                 exit(1);
1044         }
1045
1046         if (blktrace_device) {
1047                 ret = start_blktrace(blktrace_device, blktrace_outfile,
1048                                      blktrace_dest_dir);
1049                 if (ret) {
1050                         fprintf(stderr, "exiting due to blktrace failure\n");
1051                         exit(1);
1052                 }
1053                 start_mpstat(blktrace_outfile);
1054                 if (program_to_run) {
1055                         ret = run_program(program_to_run);
1056                         if (ret) {
1057                                 fprintf(stderr, "failed to run %s\n",
1058                                         program_to_run);
1059                                 exit(1);
1060                         }
1061                         wait_for_tracers();
1062                         blktrace_to_dump(blktrace_outfile);
1063                 } else {
1064                         /* no program specified, just wait for
1065                          * blktrace to exit
1066                          */
1067                         wait_for_tracers();
1068                 }
1069         }
1070
1071         /* step one, read all the traces */
1072         read_traces();
1073
1074         /* step two, find the maxes for time and offset */
1075         list_for_each_entry(tf, &all_traces, list)
1076                 compare_max_tf(tf, &seconds, &max_offset);
1077
1078         /* push the max we found into all the tfs */
1079         set_all_max_tf(seconds, max_offset);
1080
1081         /* alloc graphing structs for all the traces */
1082         setup_trace_file_graphs();
1083
1084         /* run through all the traces and read their events */
1085         read_trace_events();
1086
1087         plot = alloc_plot();
1088
1089         if (make_movie) {
1090                 plot_io_movie(plot);
1091                 exit(0);
1092         }
1093
1094         set_plot_output(plot, output_filename);
1095
1096         if (active_graphs[IO_GRAPH_INDEX] || found_mpstat)
1097                 set_legend_width(longest_label + strlen("writes"));
1098         else if (num_traces > 1)
1099                 set_legend_width(longest_label);
1100         else
1101                 set_legend_width(0);
1102
1103
1104         plot_io(plot, seconds, max_offset);
1105         plot_tput(plot, seconds);
1106         plot_cpu(plot, seconds, "CPU IO Wait Time",
1107                  CPU_IO_GRAPH_INDEX, MPSTAT_IO);
1108         plot_cpu(plot, seconds, "CPU System Time",
1109                  CPU_SYS_GRAPH_INDEX, MPSTAT_SYS);
1110         plot_cpu(plot, seconds, "CPU IRQ Time",
1111                  CPU_IRQ_GRAPH_INDEX, MPSTAT_IRQ);
1112         plot_cpu(plot, seconds, "CPU SoftIRQ Time",
1113                  CPU_SOFT_GRAPH_INDEX, MPSTAT_SOFT);
1114         plot_cpu(plot, seconds, "CPU User Time",
1115                  CPU_USER_GRAPH_INDEX, MPSTAT_USER);
1116
1117         plot_latency(plot, seconds);
1118         plot_queue_depth(plot, seconds);
1119         plot_iops(plot, seconds);
1120
1121         /* once for all */
1122         close_plot(plot);
1123         return 0;
1124 }