cmds-inspect-tree-stats.c

   1 /*
   2  * Copyright (C) 2011 Red Hat.  All rights reserved.
   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 GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include <ctype.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <sys/stat.h>
  25 #include <sys/time.h>
  26 #include <sys/types.h>
  27 #include <zlib.h>
  28
  29 #include "kerncompat.h"
  30 #include "ctree.h"
  31 #include "disk-io.h"
  32 #include "print-tree.h"
  33 #include "transaction.h"
  34 #include "list.h"
  35 #include "volumes.h"
  36 #include "utils.h"
  37 #include "commands.h"
  38 #include "cmds-inspect-tree-stats.h"
  39
  40 static int verbose = 0;
  41 static int no_pretty = 0;
  42
  43 struct seek {
  44         u64 distance;
  45         u64 count;
  46         struct rb_node n;
  47 };
  48
  49 struct root_stats {
  50         u64 total_nodes;
  51         u64 total_leaves;
  52         u64 total_bytes;
  53         u64 total_inline;
  54         u64 total_seeks;
  55         u64 forward_seeks;
  56         u64 backward_seeks;
  57         u64 total_seek_len;
  58         u64 max_seek_len;
  59         u64 total_clusters;
  60         u64 total_cluster_size;
  61         u64 min_cluster_size;
  62         u64 max_cluster_size;
  63         u64 lowest_bytenr;
  64         u64 highest_bytenr;
  65         struct rb_root seek_root;
  66         int total_levels;
  67 };
  68
  69 static int add_seek(struct rb_root *root, u64 dist)
  70 {
  71         struct rb_node **p = &root->rb_node;
  72         struct rb_node *parent = NULL;
  73         struct seek *seek = NULL;
  74
  75         while (*p) {
  76                 parent = *p;
  77                 seek = rb_entry(parent, struct seek, n);
  78
  79                 if (dist < seek->distance) {
  80                         p = &(*p)->rb_left;
  81                 } else if (dist > seek->distance) {
  82                         p = &(*p)->rb_right;
  83                 } else {
  84                         seek->count++;
  85                         return 0;
  86                 }
  87         }
  88
  89         seek = malloc(sizeof(struct seek));
  90         if (!seek)
  91                 return -ENOMEM;
  92         seek->distance = dist;
  93         seek->count = 1;
  94         rb_link_node(&seek->n, parent, p);
  95         rb_insert_color(&seek->n, root);
  96         return 0;
  97 }
  98
  99 static int walk_leaf(struct btrfs_root *root, struct btrfs_path *path,
 100                      struct root_stats *stat, int find_inline)
 101 {
 102         struct extent_buffer *b = path->nodes[0];
 103         struct btrfs_file_extent_item *fi;
 104         struct btrfs_key found_key;
 105         int i;
 106
 107         stat->total_bytes += root->nodesize;
 108         stat->total_leaves++;
 109
 110         if (!find_inline)
 111                 return 0;
 112
 113         for (i = 0; i < btrfs_header_nritems(b); i++) {
 114                 btrfs_item_key_to_cpu(b, &found_key, i);
 115                 if (found_key.type != BTRFS_EXTENT_DATA_KEY)
 116                         continue;
 117
 118                 fi = btrfs_item_ptr(b, i, struct btrfs_file_extent_item);
 119                 if (btrfs_file_extent_type(b, fi) == BTRFS_FILE_EXTENT_INLINE)
 120                         stat->total_inline +=
 121                                 btrfs_file_extent_inline_item_len(b,
 122                                                         btrfs_item_nr(i));
 123         }
 124
 125         return 0;
 126 }
 127
 128 static u64 calc_distance(u64 block1, u64 block2)
 129 {
 130         if (block1 < block2)
 131                 return block2 - block1;
 132         return block1 - block2;
 133 }
 134
 135 static int walk_nodes(struct btrfs_root *root, struct btrfs_path *path,
 136                       struct root_stats *stat, int level, int find_inline)
 137 {
 138         struct extent_buffer *b = path->nodes[level];
 139         u64 last_block;
 140         u64 cluster_size = root->nodesize;
 141         int i;
 142         int ret = 0;
 143
 144         stat->total_bytes += root->nodesize;
 145         stat->total_nodes++;
 146
 147         last_block = btrfs_header_bytenr(b);
 148         for (i = 0; i < btrfs_header_nritems(b); i++) {
 149                 struct extent_buffer *tmp = NULL;
 150                 u64 cur_blocknr = btrfs_node_blockptr(b, i);
 151
 152                 path->slots[level] = i;
 153                 if ((level - 1) > 0 || find_inline) {
 154                         tmp = read_tree_block(root, cur_blocknr,
 155                                               root->nodesize,
 156                                               btrfs_node_ptr_generation(b, i));
 157                         if (!extent_buffer_uptodate(tmp)) {
 158                                 fprintf(stderr, "Failed to read blocknr %llu\n",
 159                                         btrfs_node_blockptr(b, i));
 160                                 continue;
 161                         }
 162                         path->nodes[level - 1] = tmp;
 163                 }
 164                 if (level - 1)
 165                         ret = walk_nodes(root, path, stat, level - 1,
 166                                          find_inline);
 167                 else
 168                         ret = walk_leaf(root, path, stat, find_inline);
 169                 if (last_block + root->nodesize != cur_blocknr) {
 170                         u64 distance = calc_distance(last_block +
 171                                                      root->nodesize,
 172                                                      cur_blocknr);
 173                         stat->total_seeks++;
 174                         stat->total_seek_len += distance;
 175                         if (stat->max_seek_len < distance)
 176                                 stat->max_seek_len = distance;
 177                         if (add_seek(&stat->seek_root, distance)) {
 178                                 fprintf(stderr, "Error adding new seek\n");
 179                                 ret = -ENOMEM;
 180                                 break;
 181                         }
 182
 183                         if (last_block < cur_blocknr)
 184                                 stat->forward_seeks++;
 185                         else
 186                                 stat->backward_seeks++;
 187                         if (cluster_size != root->nodesize) {
 188                                 stat->total_cluster_size += cluster_size;
 189                                 stat->total_clusters++;
 190                                 if (cluster_size < stat->min_cluster_size)
 191                                         stat->min_cluster_size = cluster_size;
 192                                 if (cluster_size > stat->max_cluster_size)
 193                                         stat->max_cluster_size = cluster_size;
 194                         }
 195                         cluster_size = root->nodesize;
 196                 } else {
 197                         cluster_size += root->nodesize;
 198                 }
 199                 last_block = cur_blocknr;
 200                 if (cur_blocknr < stat->lowest_bytenr)
 201                         stat->lowest_bytenr = cur_blocknr;
 202                 if (cur_blocknr > stat->highest_bytenr)
 203                         stat->highest_bytenr = cur_blocknr;
 204                 free_extent_buffer(tmp);
 205                 if (ret) {
 206                         fprintf(stderr, "Error walking down path\n");
 207                         break;
 208                 }
 209         }
 210
 211         return ret;
 212 }
 213
 214 static void print_seek_histogram(struct root_stats *stat)
 215 {
 216         struct rb_node *n = rb_first(&stat->seek_root);
 217         struct seek *seek;
 218         u64 tick_interval;
 219         u64 group_start = 0;
 220         u64 group_count = 0;
 221         u64 group_end = 0;
 222         u64 i;
 223         u64 max_seek = stat->max_seek_len;
 224         int digits = 1;
 225
 226         if (stat->total_seeks < 20)
 227                 return;
 228
 229         while ((max_seek /= 10))
 230                 digits++;
 231
 232         /* Make a tick count as 5% of the total seeks */
 233         tick_interval = stat->total_seeks / 20;
 234         printf("\tSeek histogram\n");
 235         for (; n; n = rb_next(n)) {
 236                 u64 ticks, gticks = 0;
 237
 238                 seek = rb_entry(n, struct seek, n);
 239                 ticks = seek->count / tick_interval;
 240                 if (group_count)
 241                         gticks = group_count / tick_interval;
 242
 243                 if (ticks <= 2 && gticks <= 2) {
 244                         if (group_count == 0)
 245                                 group_start = seek->distance;
 246                         group_end = seek->distance;
 247                         group_count += seek->count;
 248                         continue;
 249                 }
 250
 251                 if (group_count) {
 252
 253                         gticks = group_count / tick_interval;
 254                         printf("\t\t%*Lu - %*Lu: %*Lu ", digits, group_start,
 255                                digits, group_end, digits, group_count);
 256                         if (gticks) {
 257                                 for (i = 0; i < gticks; i++)
 258                                         printf("#");
 259                                 printf("\n");
 260                         } else {
 261                                 printf("|\n");
 262                         }
 263                         group_count = 0;
 264                 }
 265
 266                 if (ticks <= 2)
 267                         continue;
 268
 269                 printf("\t\t%*Lu - %*Lu: %*Lu ", digits, seek->distance,
 270                        digits, seek->distance, digits, seek->count);
 271                 for (i = 0; i < ticks; i++)
 272                         printf("#");
 273                 printf("\n");
 274         }
 275         if (group_count) {
 276                 u64 gticks;
 277
 278                 gticks = group_count / tick_interval;
 279                 printf("\t\t%*Lu - %*Lu: %*Lu ", digits, group_start,
 280                        digits, group_end, digits, group_count);
 281                 if (gticks) {
 282                         for (i = 0; i < gticks; i++)
 283                                 printf("#");
 284                         printf("\n");
 285                 } else {
 286                         printf("|\n");
 287                 }
 288                 group_count = 0;
 289         }
 290 }
 291
 292 static void timeval_subtract(struct timeval *result, struct timeval *x,
 293                              struct timeval *y)
 294 {
 295         if (x->tv_usec < y->tv_usec) {
 296                 int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
 297                 y->tv_usec -= 1000000 * nsec;
 298                 y->tv_sec += nsec;
 299         }
 300
 301         if (x->tv_usec - y->tv_usec > 1000000) {
 302                 int nsec = (x->tv_usec - y->tv_usec) / 1000000;
 303                 y->tv_usec += 1000000 * nsec;
 304                 y->tv_sec -= nsec;
 305         }
 306
 307         result->tv_sec = x->tv_sec - y->tv_sec;
 308         result->tv_usec = x->tv_usec - y->tv_usec;
 309 }
 310
 311 static int calc_root_size(struct btrfs_root *tree_root, struct btrfs_key *key,
 312                           int find_inline)
 313 {
 314         struct btrfs_root *root;
 315         struct btrfs_path *path;
 316         struct rb_node *n;
 317         struct timeval start, end, diff = {0};
 318         struct root_stats stat;
 319         int level;
 320         int ret = 0;
 321         int size_fail = 0;
 322
 323         root = btrfs_read_fs_root(tree_root->fs_info, key);
 324         if (IS_ERR(root)) {
 325                 fprintf(stderr, "Failed to read root %llu\n", key->objectid);
 326                 return 1;
 327         }
 328
 329         path = btrfs_alloc_path();
 330         if (!path) {
 331                 fprintf(stderr, "Could not allocate path\n");
 332                 return 1;
 333         }
 334
 335         memset(&stat, 0, sizeof(stat));
 336         level = btrfs_header_level(root->node);
 337         stat.lowest_bytenr = btrfs_header_bytenr(root->node);
 338         stat.highest_bytenr = stat.lowest_bytenr;
 339         stat.min_cluster_size = (u64)-1;
 340         stat.max_cluster_size = root->nodesize;
 341         path->nodes[level] = root->node;
 342         if (gettimeofday(&start, NULL)) {
 343                 fprintf(stderr, "Error getting time: %d\n", errno);
 344                 goto out;
 345         }
 346         if (!level) {
 347                 ret = walk_leaf(root, path, &stat, find_inline);
 348                 if (ret)
 349                         goto out;
 350                 goto out_print;
 351         }
 352
 353         ret = walk_nodes(root, path, &stat, level, find_inline);
 354         if (ret)
 355                 goto out;
 356         if (gettimeofday(&end, NULL)) {
 357                 fprintf(stderr, "Error getting time: %d\n", errno);
 358                 goto out;
 359         }
 360         timeval_subtract(&diff, &end, &start);
 361 out_print:
 362         if (stat.min_cluster_size == (u64)-1) {
 363                 stat.min_cluster_size = 0;
 364                 stat.total_clusters = 1;
 365         }
 366
 367         if (no_pretty || size_fail) {
 368                 printf("\tTotal size: %llu\n", stat.total_bytes);
 369                 printf("\t\tInline data: %llu\n", stat.total_inline);
 370                 printf("\tTotal seeks: %llu\n", stat.total_seeks);
 371                 printf("\t\tForward seeks: %llu\n", stat.forward_seeks);
 372                 printf("\t\tBackward seeks: %llu\n", stat.backward_seeks);
 373                 printf("\t\tAvg seek len: %llu\n", stat.total_seeks ?
 374                         stat.total_seek_len / stat.total_seeks : 0);
 375                 print_seek_histogram(&stat);
 376                 printf("\tTotal clusters: %llu\n", stat.total_clusters);
 377                 printf("\t\tAvg cluster size: %llu\n", stat.total_cluster_size /
 378                        stat.total_clusters);
 379                 printf("\t\tMin cluster size: %llu\n", stat.min_cluster_size);
 380                 printf("\t\tMax cluster size: %llu\n", stat.max_cluster_size);
 381                 printf("\tTotal disk spread: %llu\n", stat.highest_bytenr -
 382                        stat.lowest_bytenr);
 383                 printf("\tTotal read time: %d s %d us\n", (int)diff.tv_sec,
 384                        (int)diff.tv_usec);
 385                 printf("\tLevels: %d\n", level + 1);
 386         } else {
 387                 printf("\tTotal size: %s\n", pretty_size(stat.total_bytes));
 388                 printf("\t\tInline data: %s\n", pretty_size(stat.total_inline));
 389                 printf("\tTotal seeks: %llu\n", stat.total_seeks);
 390                 printf("\t\tForward seeks: %llu\n", stat.forward_seeks);
 391                 printf("\t\tBackward seeks: %llu\n", stat.backward_seeks);
 392                 printf("\t\tAvg seek len: %s\n", stat.total_seeks ?
 393                         pretty_size(stat.total_seek_len / stat.total_seeks) :
 394                         pretty_size(0));
 395                 print_seek_histogram(&stat);
 396                 printf("\tTotal clusters: %llu\n", stat.total_clusters);
 397                 printf("\t\tAvg cluster size: %s\n",
 398                                 pretty_size((stat.total_cluster_size /
 399                                                 stat.total_clusters)));
 400                 printf("\t\tMin cluster size: %s\n",
 401                                 pretty_size(stat.min_cluster_size));
 402                 printf("\t\tMax cluster size: %s\n",
 403                                 pretty_size(stat.max_cluster_size));
 404                 printf("\tTotal disk spread: %s\n",
 405                                 pretty_size(stat.highest_bytenr -
 406                                         stat.lowest_bytenr));
 407                 printf("\tTotal read time: %d s %d us\n", (int)diff.tv_sec,
 408                        (int)diff.tv_usec);
 409                 printf("\tLevels: %d\n", level + 1);
 410         }
 411 out:
 412         while ((n = rb_first(&stat.seek_root)) != NULL) {
 413                 struct seek *seek = rb_entry(n, struct seek, n);
 414                 rb_erase(n, &stat.seek_root);
 415                 free(seek);
 416         }
 417
 418         /*
 419          * We only use path to save node data in iterating,
 420          * without holding eb's ref_cnt in path.
 421          * Don't use btrfs_free_path() here, it will free these
 422          * eb again, and cause many problems, as negative ref_cnt
 423          * or invalid memory access.
 424          */
 425         free(path);
 426         return ret;
 427 }
 428
 429 const char * const cmd_inspect_tree_stats_usage[] = {
 430         "btrfs inspect-internal tree-stats [options] <device>",
 431         "Print various stats for trees",
 432         "-b             raw numbers in bytes",
 433         NULL
 434 };
 435
 436 int cmd_inspect_tree_stats(int argc, char **argv)
 437 {
 438         struct btrfs_key key;
 439         struct btrfs_root *root;
 440         int opt;
 441         int ret = 0;
 442
 443         while ((opt = getopt(argc, argv, "vb")) != -1) {
 444                 switch (opt) {
 445                 case 'v':
 446                         verbose++;
 447                         break;
 448                 case 'b':
 449                         no_pretty = 1;
 450                         break;
 451                 default:
 452                         usage(cmd_inspect_tree_stats_usage);
 453                 }
 454         }
 455
 456         if (check_argc_exact(argc - optind, 1)) {
 457                 usage(cmd_inspect_tree_stats_usage);
 458         }
 459
 460         /*
 461         if ((ret = check_mounted(argv[optind])) < 0) {
 462                 fprintf(stderr, "Could not check mount status: %d\n", ret);
 463                 if (ret == -EACCES)
 464                         fprintf(stderr, "Maybe you need to run as root?\n");
 465                 return ret;
 466         } else if (ret) {
 467                 fprintf(stderr, "%s is currently mounted.  Aborting.\n",
 468                         argv[optind]);
 469                 return -EBUSY;
 470         }
 471         */
 472
 473         root = open_ctree(argv[optind], 0, 0);
 474         if (!root) {
 475                 fprintf(stderr, "Couldn't open ctree\n");
 476                 exit(1);
 477         }
 478
 479         printf("Calculating size of root tree\n");
 480         key.objectid = BTRFS_ROOT_TREE_OBJECTID;
 481         ret = calc_root_size(root, &key, 0);
 482         if (ret)
 483                 goto out;
 484
 485         printf("Calculating size of extent tree\n");
 486         key.objectid = BTRFS_EXTENT_TREE_OBJECTID;
 487         ret = calc_root_size(root, &key, 0);
 488         if (ret)
 489                 goto out;
 490
 491         printf("Calculating size of csum tree\n");
 492         key.objectid = BTRFS_CSUM_TREE_OBJECTID;
 493         ret = calc_root_size(root, &key, 0);
 494         if (ret)
 495                 goto out;
 496
 497         key.objectid = BTRFS_FS_TREE_OBJECTID;
 498         key.offset = (u64)-1;
 499         printf("Calculating size of fs tree\n");
 500         ret = calc_root_size(root, &key, 1);
 501         if (ret)
 502                 goto out;
 503 out:
 504         close_ctree(root);
 505         return ret;
 506 }