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