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f2fs: add proc entry to show valid block bitmap
[deliverable/linux.git] / 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_dirs = sbi->ndirty_inode[DIR_INODE];
49 si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
50 si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
51 si->wb_pages = get_pages(sbi, F2FS_WRITEBACK);
52 si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
53 si->rsvd_segs = reserved_segments(sbi);
54 si->overp_segs = overprovision_segments(sbi);
55 si->valid_count = valid_user_blocks(sbi);
56 si->valid_node_count = valid_node_count(sbi);
57 si->valid_inode_count = valid_inode_count(sbi);
58 si->inline_xattr = atomic_read(&sbi->inline_xattr);
59 si->inline_inode = atomic_read(&sbi->inline_inode);
60 si->inline_dir = atomic_read(&sbi->inline_dir);
61 si->utilization = utilization(sbi);
62
63 si->free_segs = free_segments(sbi);
64 si->free_secs = free_sections(sbi);
65 si->prefree_count = prefree_segments(sbi);
66 si->dirty_count = dirty_segments(sbi);
67 si->node_pages = NODE_MAPPING(sbi)->nrpages;
68 si->meta_pages = META_MAPPING(sbi)->nrpages;
69 si->nats = NM_I(sbi)->nat_cnt;
70 si->dirty_nats = NM_I(sbi)->dirty_nat_cnt;
71 si->sits = MAIN_SEGS(sbi);
72 si->dirty_sits = SIT_I(sbi)->dirty_sentries;
73 si->fnids = NM_I(sbi)->fcnt;
74 si->bg_gc = sbi->bg_gc;
75 si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
76 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
77 / 2;
78 si->util_valid = (int)(written_block_count(sbi) >>
79 sbi->log_blocks_per_seg)
80 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
81 / 2;
82 si->util_invalid = 50 - si->util_free - si->util_valid;
83 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
84 struct curseg_info *curseg = CURSEG_I(sbi, i);
85 si->curseg[i] = curseg->segno;
86 si->cursec[i] = curseg->segno / sbi->segs_per_sec;
87 si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
88 }
89
90 for (i = 0; i < 2; i++) {
91 si->segment_count[i] = sbi->segment_count[i];
92 si->block_count[i] = sbi->block_count[i];
93 }
94
95 si->inplace_count = atomic_read(&sbi->inplace_count);
96 }
97
98 /*
99 * This function calculates BDF of every segments
100 */
101 static void update_sit_info(struct f2fs_sb_info *sbi)
102 {
103 struct f2fs_stat_info *si = F2FS_STAT(sbi);
104 unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;
105 unsigned long long bimodal, dist;
106 unsigned int segno, vblocks;
107 int ndirty = 0;
108
109 bimodal = 0;
110 total_vblocks = 0;
111 blks_per_sec = sbi->segs_per_sec * sbi->blocks_per_seg;
112 hblks_per_sec = blks_per_sec / 2;
113 for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
114 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
115 dist = abs(vblocks - hblks_per_sec);
116 bimodal += dist * dist;
117
118 if (vblocks > 0 && vblocks < blks_per_sec) {
119 total_vblocks += vblocks;
120 ndirty++;
121 }
122 }
123 dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);
124 si->bimodal = div64_u64(bimodal, dist);
125 if (si->dirty_count)
126 si->avg_vblocks = div_u64(total_vblocks, ndirty);
127 else
128 si->avg_vblocks = 0;
129 }
130
131 /*
132 * This function calculates memory footprint.
133 */
134 static void update_mem_info(struct f2fs_sb_info *sbi)
135 {
136 struct f2fs_stat_info *si = F2FS_STAT(sbi);
137 unsigned npages;
138 int i;
139
140 if (si->base_mem)
141 goto get_cache;
142
143 si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
144 si->base_mem += 2 * sizeof(struct f2fs_inode_info);
145 si->base_mem += sizeof(*sbi->ckpt);
146
147 /* build sm */
148 si->base_mem += sizeof(struct f2fs_sm_info);
149
150 /* build sit */
151 si->base_mem += sizeof(struct sit_info);
152 si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
153 si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
154 si->base_mem += 3 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
155 si->base_mem += SIT_VBLOCK_MAP_SIZE;
156 if (sbi->segs_per_sec > 1)
157 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
158 si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
159
160 /* build free segmap */
161 si->base_mem += sizeof(struct free_segmap_info);
162 si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
163 si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
164
165 /* build curseg */
166 si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
167 si->base_mem += PAGE_SIZE * NR_CURSEG_TYPE;
168
169 /* build dirty segmap */
170 si->base_mem += sizeof(struct dirty_seglist_info);
171 si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
172 si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
173
174 /* build nm */
175 si->base_mem += sizeof(struct f2fs_nm_info);
176 si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
177
178 get_cache:
179 si->cache_mem = 0;
180
181 /* build gc */
182 if (sbi->gc_thread)
183 si->cache_mem += sizeof(struct f2fs_gc_kthread);
184
185 /* build merge flush thread */
186 if (SM_I(sbi)->cmd_control_info)
187 si->cache_mem += sizeof(struct flush_cmd_control);
188
189 /* free nids */
190 si->cache_mem += NM_I(sbi)->fcnt * sizeof(struct free_nid);
191 si->cache_mem += NM_I(sbi)->nat_cnt * sizeof(struct nat_entry);
192 si->cache_mem += NM_I(sbi)->dirty_nat_cnt *
193 sizeof(struct nat_entry_set);
194 si->cache_mem += si->inmem_pages * sizeof(struct inmem_pages);
195 for (i = 0; i <= UPDATE_INO; i++)
196 si->cache_mem += sbi->im[i].ino_num * sizeof(struct ino_entry);
197 si->cache_mem += atomic_read(&sbi->total_ext_tree) *
198 sizeof(struct extent_tree);
199 si->cache_mem += atomic_read(&sbi->total_ext_node) *
200 sizeof(struct extent_node);
201
202 si->page_mem = 0;
203 npages = NODE_MAPPING(sbi)->nrpages;
204 si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
205 npages = META_MAPPING(sbi)->nrpages;
206 si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
207 }
208
209 static int stat_show(struct seq_file *s, void *v)
210 {
211 struct f2fs_stat_info *si;
212 int i = 0;
213 int j;
214
215 mutex_lock(&f2fs_stat_mutex);
216 list_for_each_entry(si, &f2fs_stat_list, stat_list) {
217 update_general_status(si->sbi);
218
219 seq_printf(s, "\n=====[ partition info(%pg). #%d, %s]=====\n",
220 si->sbi->sb->s_bdev, i++,
221 f2fs_readonly(si->sbi->sb) ? "RO": "RW");
222 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
223 si->sit_area_segs, si->nat_area_segs);
224 seq_printf(s, "[SSA: %d] [MAIN: %d",
225 si->ssa_area_segs, si->main_area_segs);
226 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
227 si->overp_segs, si->rsvd_segs);
228 seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
229 si->utilization, si->valid_count);
230 seq_printf(s, " - Node: %u (Inode: %u, ",
231 si->valid_node_count, si->valid_inode_count);
232 seq_printf(s, "Other: %u)\n - Data: %u\n",
233 si->valid_node_count - si->valid_inode_count,
234 si->valid_count - si->valid_node_count);
235 seq_printf(s, " - Inline_xattr Inode: %u\n",
236 si->inline_xattr);
237 seq_printf(s, " - Inline_data Inode: %u\n",
238 si->inline_inode);
239 seq_printf(s, " - Inline_dentry Inode: %u\n",
240 si->inline_dir);
241 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
242 si->main_area_segs, si->main_area_sections,
243 si->main_area_zones);
244 seq_printf(s, " - COLD data: %d, %d, %d\n",
245 si->curseg[CURSEG_COLD_DATA],
246 si->cursec[CURSEG_COLD_DATA],
247 si->curzone[CURSEG_COLD_DATA]);
248 seq_printf(s, " - WARM data: %d, %d, %d\n",
249 si->curseg[CURSEG_WARM_DATA],
250 si->cursec[CURSEG_WARM_DATA],
251 si->curzone[CURSEG_WARM_DATA]);
252 seq_printf(s, " - HOT data: %d, %d, %d\n",
253 si->curseg[CURSEG_HOT_DATA],
254 si->cursec[CURSEG_HOT_DATA],
255 si->curzone[CURSEG_HOT_DATA]);
256 seq_printf(s, " - Dir dnode: %d, %d, %d\n",
257 si->curseg[CURSEG_HOT_NODE],
258 si->cursec[CURSEG_HOT_NODE],
259 si->curzone[CURSEG_HOT_NODE]);
260 seq_printf(s, " - File dnode: %d, %d, %d\n",
261 si->curseg[CURSEG_WARM_NODE],
262 si->cursec[CURSEG_WARM_NODE],
263 si->curzone[CURSEG_WARM_NODE]);
264 seq_printf(s, " - Indir nodes: %d, %d, %d\n",
265 si->curseg[CURSEG_COLD_NODE],
266 si->cursec[CURSEG_COLD_NODE],
267 si->curzone[CURSEG_COLD_NODE]);
268 seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
269 si->main_area_segs - si->dirty_count -
270 si->prefree_count - si->free_segs,
271 si->dirty_count);
272 seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
273 si->prefree_count, si->free_segs, si->free_secs);
274 seq_printf(s, "CP calls: %d (BG: %d)\n",
275 si->cp_count, si->bg_cp_count);
276 seq_printf(s, "GC calls: %d (BG: %d)\n",
277 si->call_count, si->bg_gc);
278 seq_printf(s, " - data segments : %d (%d)\n",
279 si->data_segs, si->bg_data_segs);
280 seq_printf(s, " - node segments : %d (%d)\n",
281 si->node_segs, si->bg_node_segs);
282 seq_printf(s, "Try to move %d blocks (BG: %d)\n", si->tot_blks,
283 si->bg_data_blks + si->bg_node_blks);
284 seq_printf(s, " - data blocks : %d (%d)\n", si->data_blks,
285 si->bg_data_blks);
286 seq_printf(s, " - node blocks : %d (%d)\n", si->node_blks,
287 si->bg_node_blks);
288 seq_puts(s, "\nExtent Cache:\n");
289 seq_printf(s, " - Hit Count: L1-1:%llu L1-2:%llu L2:%llu\n",
290 si->hit_largest, si->hit_cached,
291 si->hit_rbtree);
292 seq_printf(s, " - Hit Ratio: %llu%% (%llu / %llu)\n",
293 !si->total_ext ? 0 :
294 div64_u64(si->hit_total * 100, si->total_ext),
295 si->hit_total, si->total_ext);
296 seq_printf(s, " - Inner Struct Count: tree: %d(%d), node: %d\n",
297 si->ext_tree, si->zombie_tree, si->ext_node);
298 seq_puts(s, "\nBalancing F2FS Async:\n");
299 seq_printf(s, " - inmem: %4d, wb: %4d\n",
300 si->inmem_pages, si->wb_pages);
301 seq_printf(s, " - nodes: %4d in %4d\n",
302 si->ndirty_node, si->node_pages);
303 seq_printf(s, " - dents: %4d in dirs:%4d\n",
304 si->ndirty_dent, si->ndirty_dirs);
305 seq_printf(s, " - datas: %4d in files:%4d\n",
306 si->ndirty_data, si->ndirty_files);
307 seq_printf(s, " - meta: %4d in %4d\n",
308 si->ndirty_meta, si->meta_pages);
309 seq_printf(s, " - NATs: %9d/%9d\n - SITs: %9d/%9d\n",
310 si->dirty_nats, si->nats, si->dirty_sits, si->sits);
311 seq_printf(s, " - free_nids: %9d\n",
312 si->fnids);
313 seq_puts(s, "\nDistribution of User Blocks:");
314 seq_puts(s, " [ valid | invalid | free ]\n");
315 seq_puts(s, " [");
316
317 for (j = 0; j < si->util_valid; j++)
318 seq_putc(s, '-');
319 seq_putc(s, '|');
320
321 for (j = 0; j < si->util_invalid; j++)
322 seq_putc(s, '-');
323 seq_putc(s, '|');
324
325 for (j = 0; j < si->util_free; j++)
326 seq_putc(s, '-');
327 seq_puts(s, "]\n\n");
328 seq_printf(s, "IPU: %u blocks\n", si->inplace_count);
329 seq_printf(s, "SSR: %u blocks in %u segments\n",
330 si->block_count[SSR], si->segment_count[SSR]);
331 seq_printf(s, "LFS: %u blocks in %u segments\n",
332 si->block_count[LFS], si->segment_count[LFS]);
333
334 /* segment usage info */
335 update_sit_info(si->sbi);
336 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
337 si->bimodal, si->avg_vblocks);
338
339 /* memory footprint */
340 update_mem_info(si->sbi);
341 seq_printf(s, "\nMemory: %llu KB\n",
342 (si->base_mem + si->cache_mem + si->page_mem) >> 10);
343 seq_printf(s, " - static: %llu KB\n",
344 si->base_mem >> 10);
345 seq_printf(s, " - cached: %llu KB\n",
346 si->cache_mem >> 10);
347 seq_printf(s, " - paged : %llu KB\n",
348 si->page_mem >> 10);
349 }
350 mutex_unlock(&f2fs_stat_mutex);
351 return 0;
352 }
353
354 static int stat_open(struct inode *inode, struct file *file)
355 {
356 return single_open(file, stat_show, inode->i_private);
357 }
358
359 static const struct file_operations stat_fops = {
360 .open = stat_open,
361 .read = seq_read,
362 .llseek = seq_lseek,
363 .release = single_release,
364 };
365
366 int f2fs_build_stats(struct f2fs_sb_info *sbi)
367 {
368 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
369 struct f2fs_stat_info *si;
370
371 si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
372 if (!si)
373 return -ENOMEM;
374
375 si->all_area_segs = le32_to_cpu(raw_super->segment_count);
376 si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
377 si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
378 si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
379 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
380 si->main_area_sections = le32_to_cpu(raw_super->section_count);
381 si->main_area_zones = si->main_area_sections /
382 le32_to_cpu(raw_super->secs_per_zone);
383 si->sbi = sbi;
384 sbi->stat_info = si;
385
386 atomic64_set(&sbi->total_hit_ext, 0);
387 atomic64_set(&sbi->read_hit_rbtree, 0);
388 atomic64_set(&sbi->read_hit_largest, 0);
389 atomic64_set(&sbi->read_hit_cached, 0);
390
391 atomic_set(&sbi->inline_xattr, 0);
392 atomic_set(&sbi->inline_inode, 0);
393 atomic_set(&sbi->inline_dir, 0);
394 atomic_set(&sbi->inplace_count, 0);
395
396 mutex_lock(&f2fs_stat_mutex);
397 list_add_tail(&si->stat_list, &f2fs_stat_list);
398 mutex_unlock(&f2fs_stat_mutex);
399
400 return 0;
401 }
402
403 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
404 {
405 struct f2fs_stat_info *si = F2FS_STAT(sbi);
406
407 mutex_lock(&f2fs_stat_mutex);
408 list_del(&si->stat_list);
409 mutex_unlock(&f2fs_stat_mutex);
410
411 kfree(si);
412 }
413
414 int __init f2fs_create_root_stats(void)
415 {
416 struct dentry *file;
417
418 f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
419 if (!f2fs_debugfs_root)
420 return -ENOMEM;
421
422 file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
423 NULL, &stat_fops);
424 if (!file) {
425 debugfs_remove(f2fs_debugfs_root);
426 f2fs_debugfs_root = NULL;
427 return -ENOMEM;
428 }
429
430 return 0;
431 }
432
433 void f2fs_destroy_root_stats(void)
434 {
435 if (!f2fs_debugfs_root)
436 return;
437
438 debugfs_remove_recursive(f2fs_debugfs_root);
439 f2fs_debugfs_root = NULL;
440 }
Linux kernel - Deliverables
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