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f2fs: introduce NODE_MAPPING for code consistency
[mirror_ubuntu-artful-kernel.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 /* valid 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->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
43 si->rsvd_segs = reserved_segments(sbi);
44 si->overp_segs = overprovision_segments(sbi);
45 si->valid_count = valid_user_blocks(sbi);
46 si->valid_node_count = valid_node_count(sbi);
47 si->valid_inode_count = valid_inode_count(sbi);
48 si->inline_inode = sbi->inline_inode;
49 si->utilization = utilization(sbi);
50
51 si->free_segs = free_segments(sbi);
52 si->free_secs = free_sections(sbi);
53 si->prefree_count = prefree_segments(sbi);
54 si->dirty_count = dirty_segments(sbi);
55 si->node_pages = NODE_MAPPING(sbi)->nrpages;
56 si->meta_pages = META_MAPPING(sbi)->nrpages;
57 si->nats = NM_I(sbi)->nat_cnt;
58 si->sits = SIT_I(sbi)->dirty_sentries;
59 si->fnids = NM_I(sbi)->fcnt;
60 si->bg_gc = sbi->bg_gc;
61 si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
62 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
63 / 2;
64 si->util_valid = (int)(written_block_count(sbi) >>
65 sbi->log_blocks_per_seg)
66 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
67 / 2;
68 si->util_invalid = 50 - si->util_free - si->util_valid;
69 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
70 struct curseg_info *curseg = CURSEG_I(sbi, i);
71 si->curseg[i] = curseg->segno;
72 si->cursec[i] = curseg->segno / sbi->segs_per_sec;
73 si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
74 }
75
76 for (i = 0; i < 2; i++) {
77 si->segment_count[i] = sbi->segment_count[i];
78 si->block_count[i] = sbi->block_count[i];
79 }
80 }
81
82 /*
83 * This function calculates BDF of every segments
84 */
85 static void update_sit_info(struct f2fs_sb_info *sbi)
86 {
87 struct f2fs_stat_info *si = F2FS_STAT(sbi);
88 unsigned int blks_per_sec, hblks_per_sec, total_vblocks, bimodal, dist;
89 struct sit_info *sit_i = SIT_I(sbi);
90 unsigned int segno, vblocks;
91 int ndirty = 0;
92
93 bimodal = 0;
94 total_vblocks = 0;
95 blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
96 hblks_per_sec = blks_per_sec / 2;
97 mutex_lock(&sit_i->sentry_lock);
98 for (segno = 0; segno < TOTAL_SEGS(sbi); segno += sbi->segs_per_sec) {
99 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
100 dist = abs(vblocks - hblks_per_sec);
101 bimodal += dist * dist;
102
103 if (vblocks > 0 && vblocks < blks_per_sec) {
104 total_vblocks += vblocks;
105 ndirty++;
106 }
107 }
108 mutex_unlock(&sit_i->sentry_lock);
109 dist = TOTAL_SECS(sbi) * hblks_per_sec * hblks_per_sec / 100;
110 si->bimodal = bimodal / dist;
111 if (si->dirty_count)
112 si->avg_vblocks = total_vblocks / ndirty;
113 else
114 si->avg_vblocks = 0;
115 }
116
117 /*
118 * This function calculates memory footprint.
119 */
120 static void update_mem_info(struct f2fs_sb_info *sbi)
121 {
122 struct f2fs_stat_info *si = F2FS_STAT(sbi);
123 unsigned npages;
124
125 if (si->base_mem)
126 goto get_cache;
127
128 si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
129 si->base_mem += 2 * sizeof(struct f2fs_inode_info);
130 si->base_mem += sizeof(*sbi->ckpt);
131
132 /* build sm */
133 si->base_mem += sizeof(struct f2fs_sm_info);
134
135 /* build sit */
136 si->base_mem += sizeof(struct sit_info);
137 si->base_mem += TOTAL_SEGS(sbi) * sizeof(struct seg_entry);
138 si->base_mem += f2fs_bitmap_size(TOTAL_SEGS(sbi));
139 si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * TOTAL_SEGS(sbi);
140 if (sbi->segs_per_sec > 1)
141 si->base_mem += TOTAL_SECS(sbi) * sizeof(struct sec_entry);
142 si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
143
144 /* build free segmap */
145 si->base_mem += sizeof(struct free_segmap_info);
146 si->base_mem += f2fs_bitmap_size(TOTAL_SEGS(sbi));
147 si->base_mem += f2fs_bitmap_size(TOTAL_SECS(sbi));
148
149 /* build curseg */
150 si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
151 si->base_mem += PAGE_CACHE_SIZE * NR_CURSEG_TYPE;
152
153 /* build dirty segmap */
154 si->base_mem += sizeof(struct dirty_seglist_info);
155 si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(TOTAL_SEGS(sbi));
156 si->base_mem += f2fs_bitmap_size(TOTAL_SECS(sbi));
157
158 /* buld nm */
159 si->base_mem += sizeof(struct f2fs_nm_info);
160 si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
161
162 /* build gc */
163 si->base_mem += sizeof(struct f2fs_gc_kthread);
164
165 get_cache:
166 /* free nids */
167 si->cache_mem = NM_I(sbi)->fcnt;
168 si->cache_mem += NM_I(sbi)->nat_cnt;
169 npages = NODE_MAPPING(sbi)->nrpages;
170 si->cache_mem += npages << PAGE_CACHE_SHIFT;
171 npages = META_MAPPING(sbi)->nrpages;
172 si->cache_mem += npages << PAGE_CACHE_SHIFT;
173 si->cache_mem += sbi->n_orphans * sizeof(struct orphan_inode_entry);
174 si->cache_mem += sbi->n_dirty_dirs * sizeof(struct dir_inode_entry);
175 }
176
177 static int stat_show(struct seq_file *s, void *v)
178 {
179 struct f2fs_stat_info *si;
180 int i = 0;
181 int j;
182
183 mutex_lock(&f2fs_stat_mutex);
184 list_for_each_entry(si, &f2fs_stat_list, stat_list) {
185 char devname[BDEVNAME_SIZE];
186
187 update_general_status(si->sbi);
188
189 seq_printf(s, "\n=====[ partition info(%s). #%d ]=====\n",
190 bdevname(si->sbi->sb->s_bdev, devname), i++);
191 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
192 si->sit_area_segs, si->nat_area_segs);
193 seq_printf(s, "[SSA: %d] [MAIN: %d",
194 si->ssa_area_segs, si->main_area_segs);
195 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
196 si->overp_segs, si->rsvd_segs);
197 seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
198 si->utilization, si->valid_count);
199 seq_printf(s, " - Node: %u (Inode: %u, ",
200 si->valid_node_count, si->valid_inode_count);
201 seq_printf(s, "Other: %u)\n - Data: %u\n",
202 si->valid_node_count - si->valid_inode_count,
203 si->valid_count - si->valid_node_count);
204 seq_printf(s, " - Inline_data Inode: %u\n",
205 si->inline_inode);
206 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
207 si->main_area_segs, si->main_area_sections,
208 si->main_area_zones);
209 seq_printf(s, " - COLD data: %d, %d, %d\n",
210 si->curseg[CURSEG_COLD_DATA],
211 si->cursec[CURSEG_COLD_DATA],
212 si->curzone[CURSEG_COLD_DATA]);
213 seq_printf(s, " - WARM data: %d, %d, %d\n",
214 si->curseg[CURSEG_WARM_DATA],
215 si->cursec[CURSEG_WARM_DATA],
216 si->curzone[CURSEG_WARM_DATA]);
217 seq_printf(s, " - HOT data: %d, %d, %d\n",
218 si->curseg[CURSEG_HOT_DATA],
219 si->cursec[CURSEG_HOT_DATA],
220 si->curzone[CURSEG_HOT_DATA]);
221 seq_printf(s, " - Dir dnode: %d, %d, %d\n",
222 si->curseg[CURSEG_HOT_NODE],
223 si->cursec[CURSEG_HOT_NODE],
224 si->curzone[CURSEG_HOT_NODE]);
225 seq_printf(s, " - File dnode: %d, %d, %d\n",
226 si->curseg[CURSEG_WARM_NODE],
227 si->cursec[CURSEG_WARM_NODE],
228 si->curzone[CURSEG_WARM_NODE]);
229 seq_printf(s, " - Indir nodes: %d, %d, %d\n",
230 si->curseg[CURSEG_COLD_NODE],
231 si->cursec[CURSEG_COLD_NODE],
232 si->curzone[CURSEG_COLD_NODE]);
233 seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
234 si->main_area_segs - si->dirty_count -
235 si->prefree_count - si->free_segs,
236 si->dirty_count);
237 seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
238 si->prefree_count, si->free_segs, si->free_secs);
239 seq_printf(s, "GC calls: %d (BG: %d)\n",
240 si->call_count, si->bg_gc);
241 seq_printf(s, " - data segments : %d\n", si->data_segs);
242 seq_printf(s, " - node segments : %d\n", si->node_segs);
243 seq_printf(s, "Try to move %d blocks\n", si->tot_blks);
244 seq_printf(s, " - data blocks : %d\n", si->data_blks);
245 seq_printf(s, " - node blocks : %d\n", si->node_blks);
246 seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
247 si->hit_ext, si->total_ext);
248 seq_puts(s, "\nBalancing F2FS Async:\n");
249 seq_printf(s, " - nodes: %4d in %4d\n",
250 si->ndirty_node, si->node_pages);
251 seq_printf(s, " - dents: %4d in dirs:%4d\n",
252 si->ndirty_dent, si->ndirty_dirs);
253 seq_printf(s, " - meta: %4d in %4d\n",
254 si->ndirty_meta, si->meta_pages);
255 seq_printf(s, " - NATs: %5d > %lu\n",
256 si->nats, NM_WOUT_THRESHOLD);
257 seq_printf(s, " - SITs: %5d\n - free_nids: %5d\n",
258 si->sits, si->fnids);
259 seq_puts(s, "\nDistribution of User Blocks:");
260 seq_puts(s, " [ valid | invalid | free ]\n");
261 seq_puts(s, " [");
262
263 for (j = 0; j < si->util_valid; j++)
264 seq_putc(s, '-');
265 seq_putc(s, '|');
266
267 for (j = 0; j < si->util_invalid; j++)
268 seq_putc(s, '-');
269 seq_putc(s, '|');
270
271 for (j = 0; j < si->util_free; j++)
272 seq_putc(s, '-');
273 seq_puts(s, "]\n\n");
274 seq_printf(s, "SSR: %u blocks in %u segments\n",
275 si->block_count[SSR], si->segment_count[SSR]);
276 seq_printf(s, "LFS: %u blocks in %u segments\n",
277 si->block_count[LFS], si->segment_count[LFS]);
278
279 /* segment usage info */
280 update_sit_info(si->sbi);
281 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
282 si->bimodal, si->avg_vblocks);
283
284 /* memory footprint */
285 update_mem_info(si->sbi);
286 seq_printf(s, "\nMemory: %u KB = static: %u + cached: %u\n",
287 (si->base_mem + si->cache_mem) >> 10,
288 si->base_mem >> 10, si->cache_mem >> 10);
289 }
290 mutex_unlock(&f2fs_stat_mutex);
291 return 0;
292 }
293
294 static int stat_open(struct inode *inode, struct file *file)
295 {
296 return single_open(file, stat_show, inode->i_private);
297 }
298
299 static const struct file_operations stat_fops = {
300 .open = stat_open,
301 .read = seq_read,
302 .llseek = seq_lseek,
303 .release = single_release,
304 };
305
306 int f2fs_build_stats(struct f2fs_sb_info *sbi)
307 {
308 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
309 struct f2fs_stat_info *si;
310
311 si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
312 if (!si)
313 return -ENOMEM;
314
315 si->all_area_segs = le32_to_cpu(raw_super->segment_count);
316 si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
317 si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
318 si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
319 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
320 si->main_area_sections = le32_to_cpu(raw_super->section_count);
321 si->main_area_zones = si->main_area_sections /
322 le32_to_cpu(raw_super->secs_per_zone);
323 si->sbi = sbi;
324 sbi->stat_info = si;
325
326 mutex_lock(&f2fs_stat_mutex);
327 list_add_tail(&si->stat_list, &f2fs_stat_list);
328 mutex_unlock(&f2fs_stat_mutex);
329
330 return 0;
331 }
332
333 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
334 {
335 struct f2fs_stat_info *si = F2FS_STAT(sbi);
336
337 mutex_lock(&f2fs_stat_mutex);
338 list_del(&si->stat_list);
339 mutex_unlock(&f2fs_stat_mutex);
340
341 kfree(si);
342 }
343
344 void __init f2fs_create_root_stats(void)
345 {
346 struct dentry *file;
347
348 f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
349 if (!f2fs_debugfs_root)
350 goto bail;
351
352 file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
353 NULL, &stat_fops);
354 if (!file)
355 goto free_debugfs_dir;
356
357 return;
358
359 free_debugfs_dir:
360 debugfs_remove(f2fs_debugfs_root);
361
362 bail:
363 f2fs_debugfs_root = NULL;
364 return;
365 }
366
367 void f2fs_destroy_root_stats(void)
368 {
369 if (!f2fs_debugfs_root)
370 return;
371
372 debugfs_remove_recursive(f2fs_debugfs_root);
373 f2fs_debugfs_root = NULL;
374 }
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