kernel/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_ext = sbi->read_hit_ext;
  37         si->total_ext = sbi->total_hit_ext;
  38         si->ext_tree = sbi->total_ext_tree;
  39         si->ext_node = atomic_read(&sbi->total_ext_node);
  40         si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
  41         si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
  42         si->ndirty_dirs = sbi->n_dirty_dirs;
  43         si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
  44         si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
  45         si->wb_pages = get_pages(sbi, F2FS_WRITEBACK);
  46         si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
  47         si->rsvd_segs = reserved_segments(sbi);
  48         si->overp_segs = overprovision_segments(sbi);
  49         si->valid_count = valid_user_blocks(sbi);
  50         si->valid_node_count = valid_node_count(sbi);
  51         si->valid_inode_count = valid_inode_count(sbi);
  52         si->inline_inode = atomic_read(&sbi->inline_inode);
  53         si->inline_dir = atomic_read(&sbi->inline_dir);
  54         si->utilization = utilization(sbi);
  55
  56         si->free_segs = free_segments(sbi);
  57         si->free_secs = free_sections(sbi);
  58         si->prefree_count = prefree_segments(sbi);
  59         si->dirty_count = dirty_segments(sbi);
  60         si->node_pages = NODE_MAPPING(sbi)->nrpages;
  61         si->meta_pages = META_MAPPING(sbi)->nrpages;
  62         si->nats = NM_I(sbi)->nat_cnt;
  63         si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
  64         si->sits = MAIN_SEGS(sbi);
  65         si->dirty_sits = SIT_I(sbi)->dirty_sentries;
  66         si->fnids = NM_I(sbi)->fcnt;
  67         si->bg_gc = sbi->bg_gc;
  68         si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
  69                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  70                 / 2;
  71         si->util_valid = (int)(written_block_count(sbi) >>
  72                                                 sbi->log_blocks_per_seg)
  73                 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
  74                 / 2;
  75         si->util_invalid = 50 - si->util_free - si->util_valid;
  76         for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
  77                 struct curseg_info *curseg = CURSEG_I(sbi, i);
  78                 si->curseg[i] = curseg->segno;
  79                 si->cursec[i] = curseg->segno / sbi->segs_per_sec;
  80                 si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
  81         }
  82
  83         for (i = 0; i < 2; i++) {
  84                 si->segment_count[i] = sbi->segment_count[i];
  85                 si->block_count[i] = sbi->block_count[i];
  86         }
  87
  88         si->inplace_count = atomic_read(&sbi->inplace_count);
  89 }
  90
  91 /*
  92  * This function calculates BDF of every segments
  93  */
  94 static void update_sit_info(struct f2fs_sb_info *sbi)
  95 {
  96         struct f2fs_stat_info *si = F2FS_STAT(sbi);
  97         unsigned int blks_per_sec, hblks_per_sec, total_vblocks, bimodal, dist;
  98         unsigned int segno, vblocks;
  99         int ndirty = 0;
 100
 101         bimodal = 0;
 102         total_vblocks = 0;
 103         blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
 104         hblks_per_sec = blks_per_sec / 2;
 105         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
 106                 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
 107                 dist = abs(vblocks - hblks_per_sec);
 108                 bimodal += dist * dist;
 109
 110                 if (vblocks > 0 && vblocks < blks_per_sec) {
 111                         total_vblocks += vblocks;
 112                         ndirty++;
 113                 }
 114         }
 115         dist = MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec / 100;
 116         si->bimodal = bimodal / dist;
 117         if (si->dirty_count)
 118                 si->avg_vblocks = total_vblocks / ndirty;
 119         else
 120                 si->avg_vblocks = 0;
 121 }
 122
 123 /*
 124  * This function calculates memory footprint.
 125  */
 126 static void update_mem_info(struct f2fs_sb_info *sbi)
 127 {
 128         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 129         unsigned npages;
 130         int i;
 131
 132         if (si->base_mem)
 133                 goto get_cache;
 134
 135         si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
 136         si->base_mem += 2 * sizeof(struct f2fs_inode_info);
 137         si->base_mem += sizeof(*sbi->ckpt);
 138
 139         /* build sm */
 140         si->base_mem += sizeof(struct f2fs_sm_info);
 141
 142         /* build sit */
 143         si->base_mem += sizeof(struct sit_info);
 144         si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
 145         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 146         si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
 147         si->base_mem += SIT_VBLOCK_MAP_SIZE;
 148         if (sbi->segs_per_sec > 1)
 149                 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
 150         si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
 151
 152         /* build free segmap */
 153         si->base_mem += sizeof(struct free_segmap_info);
 154         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
 155         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 156
 157         /* build curseg */
 158         si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
 159         si->base_mem += PAGE_CACHE_SIZE * NR_CURSEG_TYPE;
 160
 161         /* build dirty segmap */
 162         si->base_mem += sizeof(struct dirty_seglist_info);
 163         si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
 164         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
 165
 166         /* build nm */
 167         si->base_mem += sizeof(struct f2fs_nm_info);
 168         si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
 169
 170 get_cache:
 171         si->cache_mem = 0;
 172
 173         /* build gc */
 174         if (sbi->gc_thread)
 175                 si->cache_mem += sizeof(struct f2fs_gc_kthread);
 176
 177         /* build merge flush thread */
 178         if (SM_I(sbi)->cmd_control_info)
 179                 si->cache_mem += sizeof(struct flush_cmd_control);
 180
 181         /* free nids */
 182         si->cache_mem += NM_I(sbi)->fcnt * sizeof(struct free_nid);
 183         si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
 184         si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
 185                                         sizeof(struct nat_entry_set);
 186         si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
 187         si->cache_mem += sbi->n_dirty_dirs * sizeof(struct inode_entry);
 188         for (i = 0; i <= UPDATE_INO; i++)
 189                 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
 190         si->cache_mem += sbi->total_ext_tree * sizeof(struct extent_tree);
 191         si->cache_mem += atomic_read(&sbi->total_ext_node) *
 192                                                 sizeof(struct extent_node);
 193
 194         si->page_mem = 0;
 195         npages = NODE_MAPPING(sbi)->nrpages;
 196         si->page_mem += npages << PAGE_CACHE_SHIFT;
 197         npages = META_MAPPING(sbi)->nrpages;
 198         si->page_mem += npages << PAGE_CACHE_SHIFT;
 199 }
 200
 201 static int stat_show(struct seq_file *s, void *v)
 202 {
 203         struct f2fs_stat_info *si;
 204         int i = 0;
 205         int j;
 206
 207         mutex_lock(&f2fs_stat_mutex);
 208         list_for_each_entry(si, &f2fs_stat_list, stat_list) {
 209                 char devname[BDEVNAME_SIZE];
 210
 211                 update_general_status(si->sbi);
 212
 213                 seq_printf(s, "\n=====[ partition info(%s). #%d ]=====\n",
 214                         bdevname(si->sbi->sb->s_bdev, devname), i++);
 215                 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
 216                            si->sit_area_segs, si->nat_area_segs);
 217                 seq_printf(s, "[SSA: %d] [MAIN: %d",
 218                            si->ssa_area_segs, si->main_area_segs);
 219                 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
 220                            si->overp_segs, si->rsvd_segs);
 221                 seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
 222                            si->utilization, si->valid_count);
 223                 seq_printf(s, "  - Node: %u (Inode: %u, ",
 224                            si->valid_node_count, si->valid_inode_count);
 225                 seq_printf(s, "Other: %u)\n  - Data: %u\n",
 226                            si->valid_node_count - si->valid_inode_count,
 227                            si->valid_count - si->valid_node_count);
 228                 seq_printf(s, "  - Inline_data Inode: %u\n",
 229                            si->inline_inode);
 230                 seq_printf(s, "  - Inline_dentry Inode: %u\n",
 231                            si->inline_dir);
 232                 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
 233                            si->main_area_segs, si->main_area_sections,
 234                            si->main_area_zones);
 235                 seq_printf(s, "  - COLD  data: %d, %d, %d\n",
 236                            si->curseg[CURSEG_COLD_DATA],
 237                            si->cursec[CURSEG_COLD_DATA],
 238                            si->curzone[CURSEG_COLD_DATA]);
 239                 seq_printf(s, "  - WARM  data: %d, %d, %d\n",
 240                            si->curseg[CURSEG_WARM_DATA],
 241                            si->cursec[CURSEG_WARM_DATA],
 242                            si->curzone[CURSEG_WARM_DATA]);
 243                 seq_printf(s, "  - HOT   data: %d, %d, %d\n",
 244                            si->curseg[CURSEG_HOT_DATA],
 245                            si->cursec[CURSEG_HOT_DATA],
 246                            si->curzone[CURSEG_HOT_DATA]);
 247                 seq_printf(s, "  - Dir   dnode: %d, %d, %d\n",
 248                            si->curseg[CURSEG_HOT_NODE],
 249                            si->cursec[CURSEG_HOT_NODE],
 250                            si->curzone[CURSEG_HOT_NODE]);
 251                 seq_printf(s, "  - File   dnode: %d, %d, %d\n",
 252                            si->curseg[CURSEG_WARM_NODE],
 253                            si->cursec[CURSEG_WARM_NODE],
 254                            si->curzone[CURSEG_WARM_NODE]);
 255                 seq_printf(s, "  - Indir nodes: %d, %d, %d\n",
 256                            si->curseg[CURSEG_COLD_NODE],
 257                            si->cursec[CURSEG_COLD_NODE],
 258                            si->curzone[CURSEG_COLD_NODE]);
 259                 seq_printf(s, "\n  - Valid: %d\n  - Dirty: %d\n",
 260                            si->main_area_segs - si->dirty_count -
 261                            si->prefree_count - si->free_segs,
 262                            si->dirty_count);
 263                 seq_printf(s, "  - Prefree: %d\n  - Free: %d (%d)\n\n",
 264                            si->prefree_count, si->free_segs, si->free_secs);
 265                 seq_printf(s, "CP calls: %d\n", si->cp_count);
 266                 seq_printf(s, "GC calls: %d (BG: %d)\n",
 267                            si->call_count, si->bg_gc);
 268                 seq_printf(s, "  - data segments : %d (%d)\n",
 269                                 si->data_segs, si->bg_data_segs);
 270                 seq_printf(s, "  - node segments : %d (%d)\n",
 271                                 si->node_segs, si->bg_node_segs);
 272                 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
 273                                 si->bg_data_blks + si->bg_node_blks);
 274                 seq_printf(s, "  - data blocks : %d (%d)\n", si->data_blks,
 275                                 si->bg_data_blks);
 276                 seq_printf(s, "  - node blocks : %d (%d)\n", si->node_blks,
 277                                 si->bg_node_blks);
 278                 seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
 279                            si->hit_ext, si->total_ext);
 280                 seq_printf(s, "\nExtent Tree Count: %d\n", si->ext_tree);
 281                 seq_printf(s, "\nExtent Node Count: %d\n", si->ext_node);
 282                 seq_puts(s, "\nBalancing F2FS Async:\n");
 283                 seq_printf(s, "  - inmem: %4d, wb: %4d\n",
 284                            si->inmem_pages, si->wb_pages);
 285                 seq_printf(s, "  - nodes: %4d in %4d\n",
 286                            si->ndirty_node, si->node_pages);
 287                 seq_printf(s, "  - dents: %4d in dirs:%4d\n",
 288                            si->ndirty_dent, si->ndirty_dirs);
 289                 seq_printf(s, "  - meta: %4d in %4d\n",
 290                            si->ndirty_meta, si->meta_pages);
 291                 seq_printf(s, "  - NATs: %9d/%9d\n  - SITs: %9d/%9d\n",
 292                            si->dirty_nats, si->nats, si->dirty_sits, si->sits);
 293                 seq_printf(s, "  - free_nids: %9d\n",
 294                            si->fnids);
 295                 seq_puts(s, "\nDistribution of User Blocks:");
 296                 seq_puts(s, " [ valid | invalid | free ]\n");
 297                 seq_puts(s, "  [");
 298
 299                 for (j = 0; j < si->util_valid; j++)
 300                         seq_putc(s, '-');
 301                 seq_putc(s, '|');
 302
 303                 for (j = 0; j < si->util_invalid; j++)
 304                         seq_putc(s, '-');
 305                 seq_putc(s, '|');
 306
 307                 for (j = 0; j < si->util_free; j++)
 308                         seq_putc(s, '-');
 309                 seq_puts(s, "]\n\n");
 310                 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
 311                 seq_printf(s, "SSR: %u blocks in %u segments\n",
 312                            si->block_count[SSR], si->segment_count[SSR]);
 313                 seq_printf(s, "LFS: %u blocks in %u segments\n",
 314                            si->block_count[LFS], si->segment_count[LFS]);
 315
 316                 /* segment usage info */
 317                 update_sit_info(si->sbi);
 318                 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
 319                            si->bimodal, si->avg_vblocks);
 320
 321                 /* memory footprint */
 322                 update_mem_info(si->sbi);
 323                 seq_printf(s, "\nMemory: %u KB\n",
 324                         (si->base_mem + si->cache_mem + si->page_mem) >> 10);
 325                 seq_printf(s, "  - static: %u KB\n",
 326                                 si->base_mem >> 10);
 327                 seq_printf(s, "  - cached: %u KB\n",
 328                                 si->cache_mem >> 10);
 329                 seq_printf(s, "  - paged : %u KB\n",
 330                                 si->page_mem >> 10);
 331         }
 332         mutex_unlock(&f2fs_stat_mutex);
 333         return 0;
 334 }
 335
 336 static int stat_open(struct inode *inode, struct file *file)
 337 {
 338         return single_open(file, stat_show, inode->i_private);
 339 }
 340
 341 static const struct file_operations stat_fops = {
 342         .open = stat_open,
 343         .read = seq_read,
 344         .llseek = seq_lseek,
 345         .release = single_release,
 346 };
 347
 348 int f2fs_build_stats(struct f2fs_sb_info *sbi)
 349 {
 350         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 351         struct f2fs_stat_info *si;
 352
 353         si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
 354         if (!si)
 355                 return -ENOMEM;
 356
 357         si->all_area_segs = le32_to_cpu(raw_super->segment_count);
 358         si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
 359         si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
 360         si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
 361         si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
 362         si->main_area_sections = le32_to_cpu(raw_super->section_count);
 363         si->main_area_zones = si->main_area_sections /
 364                                 le32_to_cpu(raw_super->secs_per_zone);
 365         si->sbi = sbi;
 366         sbi->stat_info = si;
 367
 368         atomic_set(&sbi->inline_inode, 0);
 369         atomic_set(&sbi->inline_dir, 0);
 370         atomic_set(&sbi->inplace_count, 0);
 371
 372         mutex_lock(&f2fs_stat_mutex);
 373         list_add_tail(&si->stat_list, &f2fs_stat_list);
 374         mutex_unlock(&f2fs_stat_mutex);
 375
 376         return 0;
 377 }
 378
 379 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
 380 {
 381         struct f2fs_stat_info *si = F2FS_STAT(sbi);
 382
 383         mutex_lock(&f2fs_stat_mutex);
 384         list_del(&si->stat_list);
 385         mutex_unlock(&f2fs_stat_mutex);
 386
 387         kfree(si);
 388 }
 389
 390 void __init f2fs_create_root_stats(void)
 391 {
 392         struct dentry *file;
 393
 394         f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
 395         if (!f2fs_debugfs_root)
 396                 return;
 397
 398         file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
 399                         NULL, &stat_fops);
 400         if (!file) {
 401                 debugfs_remove(f2fs_debugfs_root);
 402                 f2fs_debugfs_root = NULL;
 403         }
 404 }
 405
 406 void f2fs_destroy_root_stats(void)
 407 {
 408         if (!f2fs_debugfs_root)
 409                 return;
 410
 411         debugfs_remove_recursive(f2fs_debugfs_root);
 412         f2fs_debugfs_root = NULL;
 413 }