fs/f2fs/debug.c

   1 /*
   2  * f2fs debugging statistics
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  * Copyright (c) 2012 Linux Foundation
   7  * Copyright (c) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/fs.h>
  15 #include <linux/backing-dev.h>
  16 #include <linux/f2fs_fs.h>
  17 #include <linux/blkdev.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/seq_file.h>
  20
  21 #include "f2fs.h"
  22 #include "node.h"
  23 #include "segment.h"
  24 #include "gc.h"
  25
  26 static LIST_HEAD(f2fs_stat_list);
  27 static struct dentry *f2fs_debugfs_root;
  28 static DEFINE_MUTEX(f2fs_stat_mutex);
  29
  30 static void update_general_status(struct f2fs_sb_info *sbi)
  31 {
  32         struct f2fs_stat_info *si = F2FS_STAT(sbi);
  33         int i;
  34
  35         /* validation check of the segment numbers */
  36         si->hit_largest = atomic64_read(&sbi->read_hit_largest);
  37         si->hit_cached = atomic64_read(&sbi->read_hit_cached);
  38         si->hit_rbtree = atomic64_read(&sbi->read_hit_rbtree);
  39         si->hit_total = si->hit_largest + si->hit_cached + si->hit_rbtree;
  40         si->total_ext = atomic64_read(&sbi->total_hit_ext);
  41         si->ext_tree = atomic_read(&sbi->total_ext_tree);
  42         si->zombie_tree = atomic_read(&sbi->total_zombie_tree);
  43         si->ext_node = atomic_read(&sbi->total_ext_node);
  44         si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
  45         si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
  46         si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
  47         si->ndirty_data = get_pages(sbi, F2FS_DIRTY_DATA);
  48         si->ndirty_imeta = get_pages(sbi, F2FS_DIRTY_IMETA);
  49         si->ndirty_dirs = sbi->ndirty_inode[DIR_INODE];
  50         si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
  51         si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
  52         si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
  53         si->wb_bios = atomic_read(&sbi->nr_wb_bios);
  54         si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
  55         si->rsvd_segs = reserved_segments(sbi);
  56         si->overp_segs = overprovision_segments(sbi);
  57         si->valid_count = valid_user_blocks(sbi);
  58         si->discard_blks = discard_blocks(sbi);
  59         si->valid_node_count = valid_node_count(sbi);
  60         si->valid_inode_count = valid_inode_count(sbi);
  61         si->inline_xattr = atomic_read(&sbi->inline_xattr);
  62         si->inline_inode = atomic_read(&sbi->inline_inode);
  63         si->inline_dir = atomic_read(&sbi->inline_dir);
  64         si->orphans = sbi->im[ORPHAN_INO].ino_num;
  65         si->utilization = utilization(sbi);
  66
  67         si->free_segs = free_segments(sbi);
  68         si->free_secs = free_sections(sbi);
  69         si->prefree_count = prefree_segments(sbi);
  70         si->dirty_count = dirty_segments(sbi);
  71         si->node_pages = NODE_MAPPING(sbi)->nrpages;
  72         si->meta_pages = META_MAPPING(sbi)->nrpages;
  73         si->nats = NM_I(sbi)->nat_cnt;
  74         si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
  75         si->sits = MAIN_SEGS(sbi);
  76         si->dirty_sits = SIT_I(sbi)->dirty_sentries;
  77         si->fnids = NM_I(sbi)->fcnt;
  78         si->bg_gc = sbi->bg_gc;
  79         si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
  80                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  81                 / 2;
  82         si->util_valid = (int)(written_block_count(sbi) >>
  83                                                 sbi->log_blocks_per_seg)
  84                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  85                 / 2;
  86         si->util_invalid = 50 - si->util_free - si->util_valid;
  87         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
  88                 struct curseg_info *curseg = CURSEG_I(sbi, i);
  89                 si->curseg[i] = curseg->segno;
  90                 si->cursec[i] = curseg->segno / sbi->segs_per_sec;
  91                 si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
  92         }
  93
  94         for (i = 0; i < 2; i++) {
  95                 si->segment_count[i] = sbi->segment_count[i];
  96                 si->block_count[i] = sbi->block_count[i];
  97         }
  98
  99         si->inplace_count = atomic_read(&sbi->inplace_count);
 100 }
 101
 102 /*
 103  * This function calculates BDF of every segments
 104  */
 105 static void update_sit_info(struct f2fs_sb_info *sbi)
 106 {
 107         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 108         unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
 109         unsigned long long bimodal, dist;
 110         unsigned int segno, vblocks;
 111         int ndirty = 0;
 112
 113         bimodal = 0;
 114         total_vblocks = 0;
 115         blks_per_sec = sbi->segs_per_sec * sbi->blocks_per_seg;
 116         hblks_per_sec = blks_per_sec / 2;
 117         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
 118                 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
 119                 dist = abs(vblocks - hblks_per_sec);
 120                 bimodal += dist * dist;
 121
 122                 if (vblocks > 0 && vblocks < blks_per_sec) {
 123                         total_vblocks += vblocks;
 124                         ndirty++;
 125                 }
 126         }
 127         dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
 128         si->bimodal = div64_u64(bimodal, dist);
 129         if (si->dirty_count)
 130                 si->avg_vblocks = div_u64(total_vblocks, ndirty);
 131         else
 132                 si->avg_vblocks = 0;
 133 }
 134
 135 /*
 136  * This function calculates memory footprint.
 137  */
 138 static void update_mem_info(struct f2fs_sb_info *sbi)
 139 {
 140         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 141         unsigned npages;
 142         int i;
 143
 144         if (si->base_mem)
 145                 goto get_cache;
 146
 147         si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 148         si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 149         si->base_mem += sizeof(*sbi->ckpt);
 150         si->base_mem += sizeof(struct percpu_counter) * NR_COUNT_TYPE;
 151
 152         /* build sm */
 153         si->base_mem += sizeof(struct f2fs_sm_info);
 154
 155         /* build sit */
 156         si->base_mem += sizeof(struct sit_info);
 157         si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
 158         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 159         si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 160         if (f2fs_discard_en(sbi))
 161                 si->base_mem += SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 162         si->base_mem += SIT_VBLOCK_MAP_SIZE;
 163         if (sbi->segs_per_sec > 1)
 164                 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
 165         si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
 166
 167         /* build free segmap */
 168         si->base_mem += sizeof(struct free_segmap_info);
 169         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 170         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 171
 172         /* build curseg */
 173         si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
 174         si->base_mem += PAGE_SIZE * NR_CURSEG_TYPE;
 175
 176         /* build dirty segmap */
 177         si->base_mem += sizeof(struct dirty_seglist_info);
 178         si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
 179         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 180
 181         /* build nm */
 182         si->base_mem += sizeof(struct f2fs_nm_info);
 183         si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
 184
 185 get_cache:
 186         si->cache_mem = 0;
 187
 188         /* build gc */
 189         if (sbi->gc_thread)
 190                 si->cache_mem += sizeof(struct f2fs_gc_kthread);
 191
 192         /* build merge flush thread */
 193         if (SM_I(sbi)->cmd_control_info)
 194                 si->cache_mem += sizeof(struct flush_cmd_control);
 195
 196         /* free nids */
 197         si->cache_mem += NM_I(sbi)->fcnt * sizeof(struct free_nid);
 198         si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
 199         si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
 200                                         sizeof(struct nat_entry_set);
 201         si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
 202         for (i = 0; i <= ORPHAN_INO; i++)
 203                 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
 204         si->cache_mem += atomic_read(&sbi->total_ext_tree) *
 205                                                 sizeof(struct extent_tree);
 206         si->cache_mem += atomic_read(&sbi->total_ext_node) *
 207                                                 sizeof(struct extent_node);
 208
 209         si->page_mem = 0;
 210         npages = NODE_MAPPING(sbi)->nrpages;
 211         si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 212         npages = META_MAPPING(sbi)->nrpages;
 213         si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
 214 }
 215
 216 static int stat_show(struct seq_file *s, void *v)
 217 {
 218         struct f2fs_stat_info *si;
 219         int i = 0;
 220         int j;
 221
 222         mutex_lock(&f2fs_stat_mutex);
 223         list_for_each_entry(si, &f2fs_stat_list, stat_list) {
 224                 update_general_status(si->sbi);
 225
 226                 seq_printf(s, "\n=====[ partition info(%pg). #%d, %s]=====\n",
 227                         si->sbi->sb->s_bdev, i++,
 228                         f2fs_readonly(si->sbi->sb) ? "RO": "RW");
 229                 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
 230                            si->sit_area_segs, si->nat_area_segs);
 231                 seq_printf(s, "[SSA: %d] [MAIN: %d",
 232                            si->ssa_area_segs, si->main_area_segs);
 233                 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
 234                            si->overp_segs, si->rsvd_segs);
 235                 if (test_opt(si->sbi, DISCARD))
 236                         seq_printf(s, "Utilization: %u%% (%u valid blocks, %u discard blocks)\n",
 237                                 si->utilization, si->valid_count, si->discard_blks);
 238                 else
 239                         seq_printf(s, "Utilization: %u%% (%u valid blocks)\n",
 240                                 si->utilization, si->valid_count);
 241
 242                 seq_printf(s, "  - Node: %u (Inode: %u, ",
 243                            si->valid_node_count, si->valid_inode_count);
 244                 seq_printf(s, "Other: %u)\n  - Data: %u\n",
 245                            si->valid_node_count - si->valid_inode_count,
 246                            si->valid_count - si->valid_node_count);
 247                 seq_printf(s, "  - Inline_xattr Inode: %u\n",
 248                            si->inline_xattr);
 249                 seq_printf(s, "  - Inline_data Inode: %u\n",
 250                            si->inline_inode);
 251                 seq_printf(s, "  - Inline_dentry Inode: %u\n",
 252                            si->inline_dir);
 253                 seq_printf(s, "  - Orphan Inode: %u\n",
 254                            si->orphans);
 255                 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
 256                            si->main_area_segs, si->main_area_sections,
 257                            si->main_area_zones);
 258                 seq_printf(s, "  - COLD  data: %d, %d, %d\n",
 259                            si->curseg[CURSEG_COLD_DATA],
 260                            si->cursec[CURSEG_COLD_DATA],
 261                            si->curzone[CURSEG_COLD_DATA]);
 262                 seq_printf(s, "  - WARM  data: %d, %d, %d\n",
 263                            si->curseg[CURSEG_WARM_DATA],
 264                            si->cursec[CURSEG_WARM_DATA],
 265                            si->curzone[CURSEG_WARM_DATA]);
 266                 seq_printf(s, "  - HOT   data: %d, %d, %d\n",
 267                            si->curseg[CURSEG_HOT_DATA],
 268                            si->cursec[CURSEG_HOT_DATA],
 269                            si->curzone[CURSEG_HOT_DATA]);
 270                 seq_printf(s, "  - Dir   dnode: %d, %d, %d\n",
 271                            si->curseg[CURSEG_HOT_NODE],
 272                            si->cursec[CURSEG_HOT_NODE],
 273                            si->curzone[CURSEG_HOT_NODE]);
 274                 seq_printf(s, "  - File   dnode: %d, %d, %d\n",
 275                            si->curseg[CURSEG_WARM_NODE],
 276                            si->cursec[CURSEG_WARM_NODE],
 277                            si->curzone[CURSEG_WARM_NODE]);
 278                 seq_printf(s, "  - Indir nodes: %d, %d, %d\n",
 279                            si->curseg[CURSEG_COLD_NODE],
 280                            si->cursec[CURSEG_COLD_NODE],
 281                            si->curzone[CURSEG_COLD_NODE]);
 282                 seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
 283                            si->main_area_segs - si->dirty_count -
 284                            si->prefree_count - si->free_segs,
 285                            si->dirty_count);
 286                 seq_printf(s, "  - Prefree: %d\n  - Free: %d (%d)\n\n",
 287                            si->prefree_count, si->free_segs, si->free_secs);
 288                 seq_printf(s, "CP calls: %d (BG: %d)\n",
 289                                 si->cp_count, si->bg_cp_count);
 290                 seq_printf(s, "GC calls: %d (BG: %d)\n",
 291                            si->call_count, si->bg_gc);
 292                 seq_printf(s, "  - data segments : %d (%d)\n",
 293                                 si->data_segs, si->bg_data_segs);
 294                 seq_printf(s, "  - node segments : %d (%d)\n",
 295                                 si->node_segs, si->bg_node_segs);
 296                 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
 297                                 si->bg_data_blks + si->bg_node_blks);
 298                 seq_printf(s, "  - data blocks : %d (%d)\n", si->data_blks,
 299                                 si->bg_data_blks);
 300                 seq_printf(s, "  - node blocks : %d (%d)\n", si->node_blks,
 301                                 si->bg_node_blks);
 302                 seq_puts(s, "\nExtent Cache:\n");
 303                 seq_printf(s, "  - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
 304                                 si->hit_largest, si->hit_cached,
 305                                 si->hit_rbtree);
 306                 seq_printf(s, "  - Hit Ratio: %llu%% (%llu / %llu)\n",
 307                                 !si->total_ext ? 0 :
 308                                 div64_u64(si->hit_total * 100, si->total_ext),
 309                                 si->hit_total, si->total_ext);
 310                 seq_printf(s, "  - Inner Struct Count: tree: %d(%d), node: %d\n",
 311                                 si->ext_tree, si->zombie_tree, si->ext_node);
 312                 seq_puts(s, "\nBalancing F2FS Async:\n");
 313                 seq_printf(s, "  - inmem: %4d, wb_bios: %4d\n",
 314                            si->inmem_pages, si->wb_bios);
 315                 seq_printf(s, "  - nodes: %4d in %4d\n",
 316                            si->ndirty_node, si->node_pages);
 317                 seq_printf(s, "  - dents: %4d in dirs:%4d (%4d)\n",
 318                            si->ndirty_dent, si->ndirty_dirs, si->ndirty_all);
 319                 seq_printf(s, "  - datas: %4d in files:%4d\n",
 320                            si->ndirty_data, si->ndirty_files);
 321                 seq_printf(s, "  - meta: %4d in %4d\n",
 322                            si->ndirty_meta, si->meta_pages);
 323                 seq_printf(s, "  - imeta: %4d\n",
 324                            si->ndirty_imeta);
 325                 seq_printf(s, "  - NATs: %9d/%9d\n  - SITs: %9d/%9d\n",
 326                            si->dirty_nats, si->nats, si->dirty_sits, si->sits);
 327                 seq_printf(s, "  - free_nids: %9d\n",
 328                            si->fnids);
 329                 seq_puts(s, "\nDistribution of User Blocks:");
 330                 seq_puts(s, " [ valid | invalid | free ]\n");
 331                 seq_puts(s, "  [");
 332
 333                 for (j = 0; j < si->util_valid; j++)
 334                         seq_putc(s, '-');
 335                 seq_putc(s, '|');
 336
 337                 for (j = 0; j < si->util_invalid; j++)
 338                         seq_putc(s, '-');
 339                 seq_putc(s, '|');
 340
 341                 for (j = 0; j < si->util_free; j++)
 342                         seq_putc(s, '-');
 343                 seq_puts(s, "]\n\n");
 344                 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
 345                 seq_printf(s, "SSR: %u blocks in %u segments\n",
 346                            si->block_count[SSR], si->segment_count[SSR]);
 347                 seq_printf(s, "LFS: %u blocks in %u segments\n",
 348                            si->block_count[LFS], si->segment_count[LFS]);
 349
 350                 /* segment usage info */
 351                 update_sit_info(si->sbi);
 352                 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
 353                            si->bimodal, si->avg_vblocks);
 354
 355                 /* memory footprint */
 356                 update_mem_info(si->sbi);
 357                 seq_printf(s, "\nMemory: %llu KB\n",
 358                         (si->base_mem + si->cache_mem + si->page_mem) >> 10);
 359                 seq_printf(s, "  - static: %llu KB\n",
 360                                 si->base_mem >> 10);
 361                 seq_printf(s, "  - cached: %llu KB\n",
 362                                 si->cache_mem >> 10);
 363                 seq_printf(s, "  - paged : %llu KB\n",
 364                                 si->page_mem >> 10);
 365         }
 366         mutex_unlock(&f2fs_stat_mutex);
 367         return 0;
 368 }
 369
 370 static int stat_open(struct inode *inode, struct file *file)
 371 {
 372         return single_open(file, stat_show, inode->i_private);
 373 }
 374
 375 static const struct file_operations stat_fops = {
 376         .owner = THIS_MODULE,
 377         .open = stat_open,
 378         .read = seq_read,
 379         .llseek = seq_lseek,
 380         .release = single_release,
 381 };
 382
 383 int f2fs_build_stats(struct f2fs_sb_info *sbi)
 384 {
 385         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 386         struct f2fs_stat_info *si;
 387
 388         si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
 389         if (!si)
 390                 return -ENOMEM;
 391
 392         si->all_area_segs = le32_to_cpu(raw_super->segment_count);
 393         si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
 394         si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
 395         si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
 396         si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 397         si->main_area_sections = le32_to_cpu(raw_super->section_count);
 398         si->main_area_zones = si->main_area_sections /
 399                                 le32_to_cpu(raw_super->secs_per_zone);
 400         si->sbi = sbi;
 401         sbi->stat_info = si;
 402
 403         atomic64_set(&sbi->total_hit_ext, 0);
 404         atomic64_set(&sbi->read_hit_rbtree, 0);
 405         atomic64_set(&sbi->read_hit_largest, 0);
 406         atomic64_set(&sbi->read_hit_cached, 0);
 407
 408         atomic_set(&sbi->inline_xattr, 0);
 409         atomic_set(&sbi->inline_inode, 0);
 410         atomic_set(&sbi->inline_dir, 0);
 411         atomic_set(&sbi->inplace_count, 0);
 412
 413         mutex_lock(&f2fs_stat_mutex);
 414         list_add_tail(&si->stat_list, &f2fs_stat_list);
 415         mutex_unlock(&f2fs_stat_mutex);
 416
 417         return 0;
 418 }
 419
 420 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
 421 {
 422         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 423
 424         mutex_lock(&f2fs_stat_mutex);
 425         list_del(&si->stat_list);
 426         mutex_unlock(&f2fs_stat_mutex);
 427
 428         kfree(si);
 429 }
 430
 431 int __init f2fs_create_root_stats(void)
 432 {
 433         struct dentry *file;
 434
 435         f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
 436         if (!f2fs_debugfs_root)
 437                 return -ENOMEM;
 438
 439         file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
 440                         NULL, &stat_fops);
 441         if (!file) {
 442                 debugfs_remove(f2fs_debugfs_root);
 443                 f2fs_debugfs_root = NULL;
 444                 return -ENOMEM;
 445         }
 446
 447         return 0;
 448 }
 449
 450 void f2fs_destroy_root_stats(void)
 451 {
 452         if (!f2fs_debugfs_root)
 453                 return;
 454
 455         debugfs_remove_recursive(f2fs_debugfs_root);
 456         f2fs_debugfs_root = NULL;
 457 }