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