iowatcher/plot.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
  34 #include "plot.h"
  35
  36 static int io_graph_scale = 8;
  37 static int graph_width = 700;
  38 static int graph_height = 250;
  39 static int graph_circle_extra = 30;
  40 static int graph_inner_x_margin = 2;
  41 static int graph_inner_y_margin = 2;
  42 static int graph_tick_len = 5;
  43 static int graph_left_pad = 120;
  44 static int tick_label_pad = 16;
  45 static int tick_font_size = 15;
  46 static char *font_family = "sans-serif";
  47
  48 /* this is the title for the whole page */
  49 static int plot_title_height = 50;
  50 static int plot_title_font_size = 25;
  51
  52 /* this is the label at the top of each plot */
  53 static int plot_label_height = 60;
  54 static int plot_label_font_size = 20;
  55
  56 /* label for each axis is slightly smaller */
  57 static int axis_label_font_size = 16;
  58
  59 int legend_x_off = 45;
  60 int legend_y_off = -10;
  61 int legend_font_size = 15;
  62 int legend_width = 80;
  63
  64 static int rolling_avg_secs = 0;
  65
  66 static int line_len = 1024;
  67 static char line[1024];
  68
  69 static int final_height = 0;
  70 static int final_width = 0;
  71
  72 static char *colors[] = {
  73         "blue", "darkgreen",
  74         "red",
  75         "darkviolet",
  76         "orange",
  77         "aqua",
  78         "brown", "#00FF00",
  79         "yellow", "coral",
  80         "black", "darkred",
  81         "fuchsia", "crimson",
  82         NULL };
  83
  84 extern unsigned int longest_proc_name;
  85
  86 char *pick_color(void)
  87 {
  88         static int color_index;
  89         char *ret = colors[color_index];
  90
  91         if (!ret) {
  92                 color_index = 0;
  93                 ret = colors[color_index];
  94         }
  95         color_index++;
  96         return ret;
  97 }
  98
  99 char *pick_fio_color(void)
 100 {
 101         static int fio_color_index;
 102         char *ret = colors[fio_color_index];
 103
 104         if (!ret) {
 105                 fio_color_index = 0;
 106                 ret = colors[fio_color_index];
 107         }
 108         fio_color_index += 2;
 109         return ret;
 110 }
 111
 112 static int cpu_color_index;
 113
 114 char *pick_cpu_color(void)
 115 {
 116         char *ret = colors[cpu_color_index];
 117         if (!ret) {
 118                 cpu_color_index = 0;
 119                 ret = colors[cpu_color_index];
 120         }
 121         cpu_color_index++;
 122         return ret;
 123 }
 124
 125 void reset_cpu_color(void)
 126 {
 127         cpu_color_index = 0;
 128 }
 129
 130 struct graph_line_data *alloc_line_data(int min_seconds, int max_seconds, int stop_seconds)
 131 {
 132         int size = sizeof(struct graph_line_data) + (stop_seconds + 1) * sizeof(struct graph_line_pair);
 133         struct graph_line_data *gld;
 134
 135         gld = calloc(1, size);
 136         if (!gld) {
 137                 fprintf(stderr, "Unable to allocate memory for graph data\n");
 138                 exit(1);
 139         }
 140         gld->min_seconds = min_seconds;
 141         gld->max_seconds = max_seconds;
 142         gld->stop_seconds = stop_seconds;
 143         return gld;
 144 }
 145
 146 void free_line_data(struct graph_line_data *gld)
 147 {
 148         free(gld->label);
 149         free(gld);
 150 }
 151
 152 struct graph_dot_data *alloc_dot_data(int min_seconds, int max_seconds, u64 min_offset, u64 max_offset, int stop_seconds, char *color, char *label)
 153 {
 154         int size;
 155         int arr_size;
 156         int rows = graph_height * io_graph_scale;
 157         int cols = graph_width;
 158         struct graph_dot_data *gdd;
 159
 160         size = sizeof(struct graph_dot_data);
 161
 162         /* the number of bits */
 163         arr_size = (rows + 1) * cols;
 164
 165         /* the number of bytes */
 166         arr_size = (arr_size + 7) / 8;
 167
 168         gdd = calloc(1, size + arr_size);
 169         if (!gdd) {
 170                 fprintf(stderr, "Unable to allocate memory for graph data\n");
 171                 exit(1);
 172         }
 173         gdd->min_seconds = min_seconds;
 174         gdd->max_seconds = max_seconds;
 175         gdd->stop_seconds = stop_seconds;
 176         gdd->rows = rows;
 177         gdd->cols = cols;
 178         gdd->min_offset = min_offset;
 179         gdd->max_offset = max_offset;
 180         gdd->color = color;
 181         gdd->label = label;
 182
 183         if (strlen(label) > longest_proc_name)
 184                 longest_proc_name = strlen(label);
 185
 186         return gdd;
 187 }
 188
 189 void free_dot_data(struct graph_dot_data *gdd)
 190 {
 191         free(gdd);
 192 }
 193
 194 void set_gdd_bit(struct graph_dot_data *gdd, u64 offset, double bytes, double time)
 195 {
 196         double bytes_per_row = (double)(gdd->max_offset - gdd->min_offset + 1) / gdd->rows;
 197         double secs_per_col = (double)(gdd->max_seconds - gdd->min_seconds) / gdd->cols;
 198         double col;
 199         double row;
 200         int col_int;
 201         int row_int;
 202         int bit_index;
 203         int arr_index;
 204         int bit_mod;
 205         double mod = bytes_per_row;
 206
 207         if (offset > gdd->max_offset || offset < gdd->min_offset)
 208                 return;
 209         gdd->total_ios++;
 210         time = time / 1000000000.0;
 211         while (bytes > 0 && offset <= gdd->max_offset) {
 212                 row = (double)(offset - gdd->min_offset) / bytes_per_row;
 213                 col = (time - gdd->min_seconds) / secs_per_col;
 214
 215                 col_int = floor(col);
 216                 row_int = floor(row);
 217                 bit_index = row_int * gdd->cols + col_int;
 218                 arr_index = bit_index / 8;
 219                 bit_mod = bit_index % 8;
 220
 221                 gdd->data[arr_index] |= 1 << bit_mod;
 222                 offset += mod;
 223                 bytes -= mod;
 224         }
 225 }
 226
 227 void print_gdd(struct graph_dot_data *gdd)
 228 {
 229         int col = 0;
 230         int row = 0;
 231         int arr_index;
 232         u64 val;
 233         int bit_index;
 234         int bit_mod;
 235
 236         for (row = gdd->rows - 1; row >= 0; row--) {
 237                 for (col = 0; col < gdd->cols; col++) {
 238                         bit_index = row * gdd->cols + col;
 239                         arr_index = bit_index / sizeof(unsigned long);
 240                         bit_mod = bit_index % sizeof(unsigned long);
 241
 242                         val = gdd->data[arr_index];
 243                         if (val & (1 << bit_mod))
 244                                 printf("*");
 245                         else
 246                                 printf(" ");
 247                 }
 248                 printf("\n");
 249         }
 250 }
 251
 252 static double rolling_avg(struct graph_line_pair *data, int index, int distance)
 253 {
 254         double sum = 0;
 255         int start;
 256
 257         if (distance < 0)
 258                 distance = 1;
 259         if (distance > index) {
 260                 start = 0;
 261         } else {
 262                 start = index - distance;
 263         }
 264         distance = 0;
 265         while (start <= index) {
 266                 double avg;
 267
 268                 if (data[start].count)
 269                         avg = ((double)data[start].sum) / data[start].count;
 270                 else
 271                         avg= 0;
 272
 273                 sum += avg;
 274                 distance++;
 275                 start++;
 276         }
 277         return sum / distance;
 278 }
 279
 280 void write_svg_header(int fd)
 281 {
 282         char *spaces = "                                                    \n";
 283         char *header = "<svg  xmlns=\"http://www.w3.org/2000/svg\">\n";
 284         char *filter1 ="<filter id=\"shadow\">\n "
 285                 "<feOffset result=\"offOut\" in=\"SourceAlpha\" dx=\"4\" dy=\"4\" />\n "
 286                 "<feGaussianBlur result=\"blurOut\" in=\"offOut\" stdDeviation=\"2\" />\n "
 287                 "<feBlend in=\"SourceGraphic\" in2=\"blurOut\" mode=\"normal\" />\n "
 288                 "</filter>\n";
 289         char *filter2 ="<filter id=\"textshadow\" x=\"0\" y=\"0\" width=\"200%\" height=\"200%\">\n "
 290                 "<feOffset result=\"offOut\" in=\"SourceAlpha\" dx=\"1\" dy=\"1\" />\n "
 291                 "<feGaussianBlur result=\"blurOut\" in=\"offOut\" stdDeviation=\"1.5\" />\n "
 292                 "<feBlend in=\"SourceGraphic\" in2=\"blurOut\" mode=\"normal\" />\n "
 293                 "</filter>\n";
 294         char *filter3 ="<filter id=\"labelshadow\" x=\"0\" y=\"0\" width=\"200%\" height=\"200%\">\n "
 295                 "<feOffset result=\"offOut\" in=\"SourceGraphic\" dx=\"3\" dy=\"3\" />\n "
 296                 "<feColorMatrix result=\"matrixOut\" in=\"offOut\" type=\"matrix\" "
 297                 "values=\"0.2 0 0 0 0 0 0.2 0 0 0 0 0 0.2 0 0 0 0 0 1 0\" /> "
 298                 "<feGaussianBlur result=\"blurOut\" in=\"offOut\" stdDeviation=\"2\" />\n "
 299                 "<feBlend in=\"SourceGraphic\" in2=\"blurOut\" mode=\"normal\" />\n "
 300                 "</filter>\n";
 301         char *defs_start = "<defs>\n";
 302         char *defs_close = "</defs>\n";
 303         final_width = 0;
 304         final_height = 0;
 305
 306         write(fd, header, strlen(header));
 307         /* write a bunch of spaces so we can stuff in the width and height later */
 308         write(fd, spaces, strlen(spaces));
 309         write(fd, spaces, strlen(spaces));
 310         write(fd, spaces, strlen(spaces));
 311
 312         write(fd, defs_start, strlen(defs_start));
 313         write(fd, filter1, strlen(filter1));
 314         write(fd, filter2, strlen(filter2));
 315         write(fd, filter3, strlen(filter3));
 316         write(fd, defs_close, strlen(defs_close));
 317 }
 318
 319 void write_drop_shadow(struct plot *plot)
 320 {
 321         snprintf(line, line_len, "<rect x=\"0\" y=\"%d\" width=\"%d\" height=\"%d\" fill=\"white\"/>\n",
 322                  plot->start_y_offset, plot->total_width, 45);
 323         write(plot->fd, line, strlen(line));
 324
 325         snprintf(line, line_len, "<path d=\"M %d %d h %d v %d h %d t %d %d V %d H %d Z\" "
 326                  "fill=\"white\" filter=\"url(#shadow)\"/>",
 327                 0, plot->start_y_offset,
 328                 plot->total_width - graph_left_pad / 2,
 329                 -plot->total_height, 24, 1, 1,
 330                 plot->start_y_offset + 10, 0);
 331         write(plot->fd, line, strlen(line));
 332
 333         snprintf(line, line_len, "<path d=\"M %d %d H %d V %d h %d V %d H %d Z\" "
 334                  "fill=\"white\"/>",
 335                 0, plot->start_y_offset - 15, /* start */
 336                 plot->total_width - graph_left_pad / 2 - 10, /* hline over */
 337                 plot->start_y_offset - plot->total_height, /* vline up */
 338                 15, /*hline over */
 339                 plot->start_y_offset, /* vline back down */
 340                 0);
 341         write(plot->fd, line, strlen(line));
 342
 343         plot->start_y_offset += 45;
 344 }
 345
 346 /* svg y offset for the traditional 0,0 (bottom left corner) of the plot */
 347 static int axis_y(void)
 348 {
 349         return plot_label_height + graph_height + graph_inner_y_margin;
 350 }
 351
 352 /* this gives you the correct pixel for a given offset from the bottom left y axis */
 353 static double axis_y_off_double(double y)
 354 {
 355         return plot_label_height + graph_height - y;
 356 }
 357
 358 static int axis_y_off(int y)
 359 {
 360         return axis_y_off_double(y);
 361 }
 362
 363 /* svg x axis offset from 0 */
 364 static int axis_x(void)
 365 {
 366         return graph_left_pad;
 367 }
 368
 369 /* the correct pixel for a given X offset */
 370 static double axis_x_off_double(double x)
 371 {
 372         return graph_left_pad + graph_inner_x_margin + x;
 373 }
 374
 375 static int axis_x_off(int x)
 376 {
 377         return (int)axis_x_off_double(x);
 378 }
 379
 380 /*
 381  * this draws a backing rectangle for the plot and it
 382  * also creates a new svg element so our offsets can
 383  * be relative to this one plot.
 384  */
 385 void setup_axis(struct plot *plot)
 386 {
 387         int ret;
 388         int len;
 389         int fd = plot->fd;
 390         int bump_height = tick_font_size * 3 + axis_label_font_size;
 391         int local_legend_width = legend_width;
 392
 393         if (plot->no_legend)
 394                 local_legend_width = 0;
 395
 396         plot->total_width = axis_x_off(graph_width) + graph_left_pad / 2 + local_legend_width;
 397         plot->total_height = axis_y() + tick_label_pad + tick_font_size;
 398
 399         if (plot->add_xlabel)
 400                 plot->total_height += bump_height;
 401
 402         /* backing rect */
 403         snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" "
 404                  "height=\"%d\" fill=\"white\" stroke=\"none\"/>",
 405                  plot->start_x_offset,
 406                 plot->start_y_offset, plot->total_width + 40,
 407                 plot->total_height + 20);
 408         len = strlen(line);
 409         write(fd, line, len);
 410
 411         snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" "
 412                  "filter=\"url(#shadow)\" "
 413                  "height=\"%d\" fill=\"white\" stroke=\"none\"/>",
 414                  plot->start_x_offset + 15,
 415                 plot->start_y_offset, plot->total_width, plot->total_height);
 416         len = strlen(line);
 417         write(fd, line, len);
 418         plot->total_height += 20;
 419         plot->total_width += 20;
 420
 421         if (plot->total_height + plot->start_y_offset > final_height)
 422                 final_height = plot->total_height + plot->start_y_offset;
 423         if (plot->start_x_offset + plot->total_width + 40 > final_width)
 424                 final_width = plot->start_x_offset + plot->total_width + 40;
 425
 426         /* create an svg object for all our coords to be relative against */
 427         snprintf(line, line_len, "<svg x=\"%d\" y=\"%d\">\n", plot->start_x_offset, plot->start_y_offset);
 428         write(fd, line, strlen(line));
 429
 430         snprintf(line, 1024, "<path d=\"M%d %d h %d V %d H %d Z\" stroke=\"black\" stroke-width=\"2\" fill=\"none\"/>\n",
 431                  axis_x(), axis_y(),
 432                  graph_width + graph_inner_x_margin * 2, axis_y_off(graph_height) - graph_inner_y_margin,
 433                  axis_x());
 434         len = strlen(line);
 435         ret = write(fd, line, len);
 436         if (ret != len) {
 437                 fprintf(stderr, "failed to write svg axis\n");
 438                 exit(1);
 439         }
 440 }
 441
 442 /*
 443  * this draws a backing rectangle for the plot and it
 444  * also creates a new svg element so our offsets can
 445  * be relative to this one plot.
 446  */
 447 void setup_axis_spindle(struct plot *plot)
 448 {
 449         int len;
 450         int fd = plot->fd;
 451         int bump_height = tick_font_size * 3 + axis_label_font_size;
 452
 453         legend_x_off = -60;
 454
 455         plot->total_width = axis_x_off(graph_width) + legend_width;
 456         plot->total_height = axis_y() + tick_label_pad + tick_font_size;
 457
 458         if (plot->add_xlabel)
 459                 plot->total_height += bump_height;
 460
 461         /* backing rect */
 462         snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" "
 463                  "height=\"%d\" fill=\"white\" stroke=\"none\"/>",
 464                  plot->start_x_offset,
 465                 plot->start_y_offset, plot->total_width + 10,
 466                 plot->total_height + 20);
 467         len = strlen(line);
 468         write(fd, line, len);
 469
 470         snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" "
 471                  "filter=\"url(#shadow)\" "
 472                  "height=\"%d\" fill=\"white\" stroke=\"none\"/>",
 473                  plot->start_x_offset + 15,
 474                 plot->start_y_offset, plot->total_width - 30,
 475                 plot->total_height);
 476         len = strlen(line);
 477         write(fd, line, len);
 478         plot->total_height += 20;
 479
 480         if (plot->total_height + plot->start_y_offset > final_height)
 481                 final_height = plot->total_height + plot->start_y_offset;
 482         if (plot->start_x_offset + plot->total_width + 40 > final_width)
 483                 final_width = plot->start_x_offset + plot->total_width + 40;
 484
 485         /* create an svg object for all our coords to be relative against */
 486         snprintf(line, line_len, "<svg x=\"%d\" y=\"%d\">\n", plot->start_x_offset, plot->start_y_offset);
 487         write(fd, line, strlen(line));
 488
 489 }
 490
 491 /* draw a plot title.  This should be done only once,
 492  * and it bumps the plot width/height numbers by
 493  * what it draws.
 494  *
 495  * Call this before setting up the first axis
 496  */
 497 void set_plot_title(struct plot *plot, char *title)
 498 {
 499         int len;
 500         int fd = plot->fd;
 501
 502         plot->total_height = plot_title_height;
 503         plot->total_width = axis_x_off(graph_width) + graph_left_pad / 2 + legend_width;
 504
 505         /* backing rect */
 506         snprintf(line, line_len, "<rect x=\"0\" y=\"%d\" width=\"%d\" height=\"%d\" fill=\"white\" stroke=\"none\"/>",
 507                 plot->start_y_offset, plot->total_width + 40, plot_title_height + 20);
 508         len = strlen(line);
 509         write(fd, line, len);
 510
 511         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 512                  "font-weight=\"bold\" fill=\"black\" style=\"text-anchor: %s\">%s</text>\n",
 513                  axis_x_off(graph_width / 2),
 514                 plot->start_y_offset + plot_title_height / 2,
 515                 font_family, plot_title_font_size, "middle", title);
 516         plot->start_y_offset += plot_title_height;
 517         len = strlen(line);
 518         write(fd, line, len);
 519 }
 520
 521 #define TICK_MINI_STEPS 3
 522
 523 static double find_step(double first, double last, int num_ticks)
 524 {
 525         int mini_step[TICK_MINI_STEPS] = { 1, 2, 5 };
 526         int cur_mini_step = 0;
 527         double step = (last - first) / num_ticks;
 528         double log10 = log(10);
 529
 530         /* Round to power of 10 */
 531         step = exp(floor(log(step) / log10) * log10);
 532         /* Scale down step to provide enough ticks */
 533         while ((last - first) / (step * mini_step[cur_mini_step]) > num_ticks
 534                && cur_mini_step < TICK_MINI_STEPS)
 535                 cur_mini_step++;
 536         step *= mini_step[cur_mini_step - 1];
 537
 538         return step;
 539 }
 540
 541 /*
 542  * create evenly spread out ticks along the xaxis.  if tick only is set
 543  * this just makes the ticks, otherwise it labels each tick as it goes
 544  */
 545 void set_xticks(struct plot *plot, int num_ticks, int first, int last)
 546 {
 547         int pixels_per_tick;
 548         double step;
 549         int i;
 550         int tick_y = axis_y_off(graph_tick_len) + graph_inner_y_margin;
 551         int tick_x = axis_x();
 552         int tick_only = plot->add_xlabel == 0;
 553
 554         int text_y = axis_y() + tick_label_pad;
 555
 556         char *middle = "middle";
 557         char *start = "start";
 558
 559         step = find_step(first, last, num_ticks);
 560         /*
 561          * We don't want last two ticks to be too close together so subtract
 562          * 20% of the step from the interval
 563          */
 564         num_ticks = (double)(last - first - step / 5) / step + 1;
 565         pixels_per_tick = graph_width * step / (double)(last - first);
 566
 567         for (i = 0; i < num_ticks; i++) {
 568                 char *anchor;
 569                 if (i != 0) {
 570                         snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"2\" height=\"%d\" style=\"stroke:none;fill:black;\"/>\n",
 571                                 tick_x, tick_y, graph_tick_len);
 572                         write(plot->fd, line, strlen(line));
 573                         anchor = middle;
 574                 } else {
 575                         anchor = start;
 576                 }
 577
 578                 if (!tick_only) {
 579                         if (step >= 1)
 580                                 snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 581                                         "fill=\"black\" style=\"text-anchor: %s\">%d</text>\n",
 582                                         tick_x, text_y, font_family, tick_font_size, anchor,
 583                                         (int)(first + step * i));
 584                         else
 585                                 snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 586                                         "fill=\"black\" style=\"text-anchor: %s\">%.2f</text>\n",
 587                                         tick_x, text_y, font_family, tick_font_size, anchor,
 588                                         first + step * i);
 589                         write(plot->fd, line, strlen(line));
 590                 }
 591                 tick_x += pixels_per_tick;
 592         }
 593
 594         if (!tick_only) {
 595                 if (step >= 1)
 596                         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 597                                 "fill=\"black\" style=\"text-anchor: middle\">%d</text>\n",
 598                                 axis_x_off(graph_width - 2),
 599                                 text_y, font_family, tick_font_size, last);
 600                 else
 601                         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 602                                 "fill=\"black\" style=\"text-anchor: middle\">%.2f</text>\n",
 603                                 axis_x_off(graph_width - 2),
 604                                 text_y, font_family, tick_font_size, (double)last);
 605                 write(plot->fd, line, strlen(line));
 606         }
 607 }
 608
 609 void set_ylabel(struct plot *plot, char *label)
 610 {
 611         int len;
 612         int fd = plot->fd;
 613
 614         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" "
 615                  "transform=\"rotate(-90 %d %d)\" font-weight=\"bold\" "
 616                  "font-size=\"%d\" fill=\"black\" style=\"text-anchor: %s\">%s</text>\n",
 617                  graph_left_pad / 2 - axis_label_font_size,
 618                  axis_y_off(graph_height / 2),
 619                  font_family,
 620                  graph_left_pad / 2 - axis_label_font_size,
 621                  (int)axis_y_off(graph_height / 2),
 622                  axis_label_font_size, "middle", label);
 623         len = strlen(line);
 624         write(fd, line, len);
 625 }
 626
 627 void set_xlabel(struct plot *plot, char *label)
 628 {
 629         int len;
 630         int fd = plot->fd;
 631         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" "
 632                  "font-weight=\"bold\" "
 633                  "font-size=\"%d\" fill=\"black\" style=\"text-anchor: %s\">%s</text>\n",
 634                  axis_x_off(graph_width / 2),
 635                  axis_y() + tick_font_size * 3 + axis_label_font_size / 2,
 636                  font_family,
 637                  axis_label_font_size, "middle", label);
 638         len = strlen(line);
 639         write(fd, line, len);
 640
 641 }
 642
 643 /*
 644  * create evenly spread out ticks along the y axis.
 645  * The ticks are labeled as it goes
 646  */
 647 void set_yticks(struct plot *plot, int num_ticks, int first, int last, char *units)
 648 {
 649         int pixels_per_tick = graph_height / num_ticks;
 650         int step = (last - first) / num_ticks;
 651         int i;
 652         int tick_y = 0;
 653         int text_x = axis_x() - 6;
 654         int tick_x = axis_x();
 655         char *anchor = "end";
 656
 657         for (i = 0; i < num_ticks; i++) {
 658                 if (i != 0) {
 659                         snprintf(line, line_len, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" "
 660                                  "style=\"stroke:lightgray;stroke-width:2;stroke-dasharray:9,12;\"/>\n",
 661                                 tick_x, axis_y_off(tick_y),
 662                                 axis_x_off(graph_width), axis_y_off(tick_y));
 663                         write(plot->fd, line, strlen(line));
 664                 }
 665
 666                 snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 667                          "fill=\"black\" style=\"text-anchor: %s\">%d%s</text>\n",
 668                         text_x,
 669                         axis_y_off(tick_y - tick_font_size / 2),
 670                         font_family, tick_font_size, anchor, first + step * i, units);
 671                 write(plot->fd, line, strlen(line));
 672                 tick_y += pixels_per_tick;
 673         }
 674         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
 675                  "fill=\"black\" style=\"text-anchor: %s\">%d%s</text>\n",
 676                  text_x, axis_y_off(graph_height), font_family, tick_font_size, anchor, last, units);
 677         write(plot->fd, line, strlen(line));
 678 }
 679
 680 void set_plot_label(struct plot *plot, char *label)
 681 {
 682         int len;
 683         int fd = plot->fd;
 684
 685         snprintf(line, line_len, "<text x=\"%d\" y=\"%d\" font-family=\"%s\" "
 686                  "font-size=\"%d\" fill=\"black\" style=\"text-anchor: %s\">%s</text>\n",
 687                  axis_x() + graph_width / 2,
 688                  plot_label_height / 2,
 689                 font_family, plot_label_font_size, "middle", label);
 690         len = strlen(line);
 691         write(fd, line, len);
 692 }
 693
 694 static void close_svg(int fd)
 695 {
 696         char *close_line = "</svg>\n";
 697
 698         write(fd, close_line, strlen(close_line));
 699 }
 700
 701 int close_plot(struct plot *plot)
 702 {
 703         close_svg(plot->fd);
 704         if (plot->direction == PLOT_DOWN)
 705                 plot->start_y_offset += plot->total_height;
 706         else if (plot->direction == PLOT_ACROSS)
 707                 plot->start_x_offset += plot->total_width;
 708         return 0;
 709 }
 710
 711 struct plot *alloc_plot(void)
 712 {
 713         struct plot *plot;
 714         plot = calloc(1, sizeof(*plot));
 715         if (!plot) {
 716                 fprintf(stderr, "Unable to allocate memory %s\n", strerror(errno));
 717                 exit(1);
 718         }
 719         plot->fd = 0;
 720         return plot;
 721 }
 722
 723 int close_plot_file(struct plot *plot)
 724 {
 725         int ret;
 726         ret = lseek(plot->fd, 0, SEEK_SET);
 727         if (ret == (off_t)-1) {
 728                 perror("seek");
 729                 exit(1);
 730         }
 731         final_width = ((final_width  + 1) / 2) * 2;
 732         final_height = ((final_height  + 1) / 2) * 2;
 733         snprintf(line, line_len, "<svg  xmlns=\"http://www.w3.org/2000/svg\" "
 734                  "width=\"%d\" height=\"%d\">\n",
 735                  final_width, final_height);
 736         write(plot->fd, line, strlen(line));
 737         snprintf(line, line_len, "<rect x=\"0\" y=\"0\" width=\"%d\" "
 738                  "height=\"%d\" fill=\"white\"/>\n", final_width, final_height);
 739         write(plot->fd, line, strlen(line));
 740         close(plot->fd);
 741         plot->fd = 0;
 742         return 0;
 743 }
 744
 745 void set_plot_output(struct plot *plot, char *filename)
 746 {
 747         int fd;
 748
 749         if (plot->fd)
 750                 close_plot_file(plot);
 751         fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
 752         if (fd < 0) {
 753                 fprintf(stderr, "Unable to open output file %s err %s\n", filename, strerror(errno));
 754                 exit(1);
 755         }
 756         plot->fd = fd;
 757         plot->start_y_offset = plot->start_x_offset = 0;
 758         write_svg_header(fd);
 759 }
 760
 761 char *byte_unit_names[] = { "", "K", "M", "G", "T", "P", "E", "Z", "Y", "unobtainium" };
 762 int MAX_BYTE_UNIT_SCALE = 9;
 763
 764 char *time_unit_names[] = { "n", "u", "m", "s" };
 765 int MAX_TIME_UNIT_SCALE = 3;
 766
 767 void scale_line_graph_bytes(u64 *max, char **units, u64 factor)
 768 {
 769         int scale = 0;
 770         u64 val = *max;
 771         u64 div = 1;
 772         while (val > factor * 64) {
 773                 val /= factor;
 774                 scale++;
 775                 div *= factor;
 776         }
 777         *units = byte_unit_names[scale];
 778         if (scale == 0)
 779                 return;
 780
 781         if (scale > MAX_BYTE_UNIT_SCALE)
 782                 scale = MAX_BYTE_UNIT_SCALE;
 783
 784         *max /= div;
 785 }
 786
 787 void scale_line_graph_time(u64 *max, char **units)
 788 {
 789         int scale = 0;
 790         u64 val = *max;
 791         u64 div = 1;
 792         while (val > 1000 * 10) {
 793                 val /= 1000;
 794                 scale++;
 795                 div *= 1000;
 796                 if (scale == MAX_TIME_UNIT_SCALE)
 797                         break;
 798         }
 799         *units = time_unit_names[scale];
 800         if (scale == 0)
 801                 return;
 802
 803         *max /= div;
 804 }
 805
 806 int svg_line_graph(struct plot *plot, struct graph_line_data *gld, char *color, int thresh1, int thresh2)
 807 {
 808         int i;
 809         double val;
 810         double avg;
 811         int rolling;
 812         int fd = plot->fd;
 813         char *start = "<path d=\"";
 814         double yscale = ((double)gld->max) / graph_height;
 815         double xscale = (double)(gld->max_seconds - gld->min_seconds - 1) / graph_width;
 816         char c = 'M';
 817         double x;
 818         int printed_header = 0;
 819         int printed_lines = 0;
 820
 821         if (thresh1 && thresh2)
 822                 rolling = 0;
 823         else if (rolling_avg_secs)
 824                 rolling = rolling_avg_secs;
 825         else
 826                 rolling = (gld->stop_seconds - gld->min_seconds) / 25;
 827
 828         for (i = gld->min_seconds; i < gld->stop_seconds; i++) {
 829                 avg = rolling_avg(gld->data, i, rolling);
 830                 if (yscale == 0)
 831                         val = 0;
 832                 else
 833                         val = avg / yscale;
 834
 835                 if (val > graph_height)
 836                         val = graph_height;
 837                 if (val < 0)
 838                         val = 0;
 839
 840                 x = (double)(i - gld->min_seconds) / xscale;
 841                 if (!thresh1 && !thresh2) {
 842
 843                         if (!printed_header) {
 844                                 write(fd, start, strlen(start));
 845                                 printed_header = 1;
 846                         }
 847
 848                         /* in full line mode, everything in the graph is connected */
 849                         snprintf(line, line_len, "%c %d %d ", c, axis_x_off(x), axis_y_off(val));
 850                         c = 'L';
 851                         write(fd, line, strlen(line));
 852                         printed_lines = 1;
 853                 } else if (avg > thresh1 || avg > thresh2) {
 854                         int len = 10;
 855                         if (!printed_header) {
 856                                 write(fd, start, strlen(start));
 857                                 printed_header = 1;
 858                         }
 859
 860                         /* otherwise, we just print a bar up there to show this one data point */
 861                         if (i >= gld->stop_seconds - 2)
 862                                 len = -10;
 863
 864                         /*
 865                          * we don't use the rolling averages here to show high
 866                          * points in the data
 867                          */
 868                         snprintf(line, line_len, "M %d %d h %d ", axis_x_off(x),
 869                                  axis_y_off(val), len);
 870                         write(fd, line, strlen(line));
 871                         printed_lines = 1;
 872                 }
 873
 874         }
 875         if (printed_lines) {
 876                 snprintf(line, line_len, "\" fill=\"none\" stroke=\"%s\" stroke-width=\"2\"/>\n", color);
 877                 write(fd, line, strlen(line));
 878         }
 879         if (plot->timeline)
 880                 svg_write_time_line(plot, plot->timeline);
 881
 882         return 0;
 883 }
 884
 885 void svg_write_time_line(struct plot *plot, int col)
 886 {
 887         snprintf(line, line_len, "<line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" "
 888                                  "style=\"stroke:black;stroke-width:2;\"/>\n",
 889                                  axis_x_off(col), axis_y_off(0),
 890                                  axis_x_off(col), axis_y_off(graph_height));
 891         write(plot->fd, line, strlen(line));
 892 }
 893
 894 static int svg_add_io(int fd, double row, double col, double width, double height, char *color)
 895 {
 896         float rx = 0;
 897
 898         snprintf(line, line_len, "<rect x=\"%.2f\" y=\"%.2f\" width=\"%.1f\" height=\"%.1f\" "
 899                  "rx=\"%.2f\" style=\"stroke:none;fill:%s;stroke-width:0\"/>\n",
 900                  axis_x_off_double(col), axis_y_off_double(row), width, height, rx, color);
 901         return write(fd, line, strlen(line));
 902 }
 903
 904 int svg_io_graph_movie_array(struct plot *plot, struct pid_plot_history *pph)
 905 {
 906         double cell_index;
 907         double movie_row;
 908         double movie_col;
 909         int i;
 910
 911         for (i = 0; i < pph->num_used; i++) {
 912                 cell_index = pph->history[i];
 913                 movie_row = floor(cell_index / graph_width);
 914                 movie_col = cell_index - movie_row * graph_width;
 915                 svg_add_io(plot->fd, movie_row, movie_col, 4, 4, pph->color);
 916         }
 917         return 0;
 918 }
 919
 920 static float spindle_steps = 0;
 921
 922 void rewind_spindle_steps(int num)
 923 {
 924         spindle_steps -= num * 0.01;
 925 }
 926
 927 int svg_io_graph_movie_array_spindle(struct plot *plot, struct pid_plot_history *pph)
 928 {
 929         double cell_index;
 930         int i;
 931         int num_circles = 0;
 932         double cells_per_circle;
 933         double circle_num;
 934         double degrees_per_cell;
 935         double rot;
 936         double center_x;
 937         double center_y;
 938         double graph_width_extra = graph_width + graph_circle_extra;
 939         double graph_height_extra = graph_height + graph_circle_extra;
 940         double radius;;
 941
 942         if (graph_width_extra > graph_height_extra)
 943                 graph_width_extra = graph_height_extra;
 944
 945         if (graph_width_extra < graph_height_extra)
 946                 graph_height_extra = graph_width_extra;
 947
 948         radius = graph_width_extra;
 949
 950         center_x = axis_x_off_double(graph_width_extra / 2);
 951         center_y = axis_y_off_double(graph_height_extra / 2);
 952
 953         snprintf(line, line_len, "<g transform=\"rotate(%.4f, %.2f, %.2f)\"> "
 954                  "<circle cx=\"%.2f\" cy=\"%.2f\" "
 955                  "stroke=\"black\" stroke-width=\"6\" "
 956                  "r=\"%.2f\" fill=\"none\"/>\n",
 957                  spindle_steps * 1.2, center_x, center_y, center_x, center_y, graph_width_extra / 2);
 958         write(plot->fd, line, strlen(line));
 959         snprintf(line, line_len, "<circle cx=\"%.2f\" cy=\"%.2f\" "
 960                 "stroke=\"none\" fill=\"red\" r=\"%.2f\"/>\n</g>\n",
 961                 axis_x_off_double(graph_width_extra), center_y, 4.5);
 962         write(plot->fd, line, strlen(line));
 963         spindle_steps += 0.01;
 964
 965         radius = floor(radius / 2);
 966         num_circles = radius / 4 - 3;
 967         cells_per_circle = pph->history_max / num_circles;
 968         degrees_per_cell = 360 / cells_per_circle;
 969
 970         for (i = 0; i < pph->num_used; i++) {
 971                 cell_index = pph->history[i];
 972                 circle_num = floor(cell_index / cells_per_circle);
 973                 rot = cell_index - circle_num * cells_per_circle;
 974                 circle_num = num_circles - circle_num;
 975                 radius = circle_num * 4;
 976
 977                 rot = rot * degrees_per_cell;
 978                 rot -= spindle_steps;
 979                 snprintf(line, line_len, "<path transform=\"rotate(%.4f, %.2f, %.2f)\" "
 980                          "d=\"M %.2f %.2f a %.2f %.2f 0 0 1 0 5\" "
 981                          "stroke=\"%s\" stroke-width=\"4\"/>\n",
 982                          -rot, center_x, center_y,
 983                          axis_x_off_double(graph_width_extra / 2 + radius) + 8, center_y,
 984                          radius, radius, pph->color);
 985
 986                 write(plot->fd, line, strlen(line));
 987         }
 988         return 0;
 989 }
 990
 991 static int add_plot_history(struct pid_plot_history *pph, double val)
 992 {
 993         if (pph->num_used == pph->history_len) {
 994                 pph->history_len += 4096;
 995                 pph->history = realloc(pph->history,
 996                                        pph->history_len * sizeof(double));
 997                 if (!pph->history) {
 998                         perror("Unable to allocate memory");
 999                         exit(1);
1000                 }
1001         }
1002         pph->history[pph->num_used++] = val;
1003         return 0;
1004 }
1005
1006 int svg_io_graph_movie(struct graph_dot_data *gdd, struct pid_plot_history *pph, int col)
1007 {
1008         int row = 0;
1009         int arr_index;
1010         unsigned char val;
1011         int bit_index;
1012         int bit_mod;
1013         double blocks_per_row = (gdd->max_offset - gdd->min_offset + 1) / gdd->rows;
1014         double movie_blocks_per_cell = (gdd->max_offset - gdd->min_offset + 1) / (graph_width * graph_height);
1015         double cell_index;
1016         int margin_orig = graph_inner_y_margin;
1017
1018         graph_inner_y_margin += 5;
1019         pph->history_max = (gdd->max_offset - gdd->min_offset + 1) / movie_blocks_per_cell;
1020
1021         for (row = gdd->rows - 1; row >= 0; row--) {
1022                 bit_index = row * gdd->cols + col;
1023                 arr_index = bit_index / 8;
1024                 bit_mod = bit_index % 8;
1025
1026                 if (arr_index < 0)
1027                         continue;
1028                 val = gdd->data[arr_index];
1029                 if (val & (1 << bit_mod)) {
1030                         /* in bytes, linear offset from the start of the drive */
1031                         cell_index = (double)row * blocks_per_row;
1032
1033                         /* a cell number in the graph */
1034                         cell_index /= movie_blocks_per_cell;
1035
1036                         add_plot_history(pph, cell_index);
1037                 }
1038         }
1039         graph_inner_y_margin = margin_orig;
1040         return 0;
1041 }
1042
1043 int svg_io_graph(struct plot *plot, struct graph_dot_data *gdd)
1044 {
1045         int fd = plot->fd;;
1046         int col = 0;
1047         int row = 0;
1048         int arr_index;
1049         unsigned char val;
1050         int bit_index;
1051         int bit_mod;
1052
1053         for (row = gdd->rows - 1; row >= 0; row--) {
1054                 for (col = 0; col < gdd->cols; col++) {
1055                         bit_index = row * gdd->cols + col;
1056                         arr_index = bit_index / 8;
1057                         bit_mod = bit_index % 8;
1058
1059                         if (arr_index < 0)
1060                                 continue;
1061                         val = gdd->data[arr_index];
1062                         if (val & (1 << bit_mod))
1063                                 svg_add_io(fd, floor(row / io_graph_scale), col, 1.5, 1.5, gdd->color);
1064                 }
1065         }
1066         return 0;
1067 }
1068
1069 void svg_alloc_legend(struct plot *plot, int num_lines)
1070 {
1071         char **lines = calloc(num_lines, sizeof(char *));
1072         plot->legend_index = 0;
1073         plot->legend_lines = lines;
1074         plot->num_legend_lines = num_lines;
1075 }
1076
1077 void svg_free_legend(struct plot *plot)
1078 {
1079         int i;
1080         for (i = 0; i < plot->legend_index; i++)
1081                 free(plot->legend_lines[i]);
1082         free(plot->legend_lines);
1083         plot->legend_lines = NULL;
1084         plot->legend_index = 0;
1085 }
1086
1087 void svg_write_legend(struct plot *plot)
1088 {
1089         int legend_line_x = axis_x_off(graph_width) + legend_x_off;
1090         int legend_line_y = axis_y_off(graph_height) + legend_y_off;
1091         int i;
1092
1093         if (plot->legend_index == 0)
1094                 return;
1095
1096         snprintf(line, line_len, "<rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" "
1097                  "fill=\"white\" filter=\"url(#shadow)\"/>\n",
1098                  legend_line_x - 15,
1099                  legend_line_y - 12,
1100                  legend_width,
1101                  plot->legend_index * legend_font_size + legend_font_size / 2 + 12);
1102
1103         write(plot->fd, line, strlen(line));
1104         for (i = 0; i < plot->legend_index; i++) {
1105                 write(plot->fd, plot->legend_lines[i],
1106                       strlen(plot->legend_lines[i]));
1107                 free(plot->legend_lines[i]);
1108         }
1109         free(plot->legend_lines);
1110         plot->legend_lines = NULL;
1111         plot->legend_index = 0;
1112 }
1113
1114 void svg_add_legend(struct plot *plot, char *text, char *extra, char *color)
1115 {
1116         int legend_line_x = axis_x_off(graph_width) + legend_x_off;
1117         int legend_line_y = axis_y_off(graph_height) + legend_y_off;
1118
1119         if (!text && (!extra || strlen(extra) == 0))
1120                 return;
1121
1122         legend_line_y += plot->legend_index * legend_font_size + legend_font_size / 2;
1123         snprintf(line, line_len, "<path d=\"M %d %d h 8\" stroke=\"%s\" stroke-width=\"8\" "
1124                  "filter=\"url(#labelshadow)\"/> "
1125                  "<text x=\"%d\" y=\"%d\" font-family=\"%s\" font-size=\"%d\" "
1126                  "fill=\"black\" style=\"text-anchor: left\">%s%s</text>\n",
1127                  legend_line_x, legend_line_y,
1128                  color, legend_line_x + 13,
1129                  legend_line_y + 4, font_family, legend_font_size,
1130                  text, extra);
1131
1132         plot->legend_lines[plot->legend_index++] = strdup(line);
1133 }
1134
1135 void set_legend_width(int longest_str)
1136 {
1137         if (longest_str)
1138                 legend_width = longest_str * (legend_font_size * 3 / 4) + 25;
1139         else
1140                 legend_width = 0;
1141 }
1142
1143 void set_rolling_avg(int rolling)
1144 {
1145         rolling_avg_secs = rolling;
1146 }
1147
1148 void set_io_graph_scale(int scale)
1149 {
1150         io_graph_scale = scale;
1151 }
1152
1153 void set_graph_size(int width, int height)
1154 {
1155         graph_width = width;
1156         graph_height = height;
1157 }
1158
1159 void get_graph_size(int *width, int *height)
1160 {
1161         *width = graph_width;
1162         *height = graph_height;
1163 }
1164
1165 void set_graph_height(int h)
1166 {
1167         graph_height = h;
1168 }
1169 void set_graph_width(int w)
1170 {
1171         graph_width = w;
1172 }