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