projects/linux·blob v3.13 · refs

353 lines · 11.2 KiB

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
26static LIST_HEAD(f2fs_stat_list);
27static struct dentry *debugfs_root;
28static DEFINE_MUTEX(f2fs_stat_mutex);
29
30static 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->utilization = utilization(sbi);
49
50 si->free_segs = free_segments(sbi);
51 si->free_secs = free_sections(sbi);
52 si->prefree_count = prefree_segments(sbi);
53 si->dirty_count = dirty_segments(sbi);
54 si->node_pages = sbi->node_inode->i_mapping->nrpages;
55 si->meta_pages = sbi->meta_inode->i_mapping->nrpages;
56 si->nats = NM_I(sbi)->nat_cnt;
57 si->sits = SIT_I(sbi)->dirty_sentries;
58 si->fnids = NM_I(sbi)->fcnt;
59 si->bg_gc = sbi->bg_gc;
60 si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
61 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
62 / 2;
63 si->util_valid = (int)(written_block_count(sbi) >>
64 sbi->log_blocks_per_seg)
65 * 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
66 / 2;
67 si->util_invalid = 50 - si->util_free - si->util_valid;
68 for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
69 struct curseg_info *curseg = CURSEG_I(sbi, i);
70 si->curseg[i] = curseg->segno;
71 si->cursec[i] = curseg->segno / sbi->segs_per_sec;
72 si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
73 }
74
75 for (i = 0; i < 2; i++) {
76 si->segment_count[i] = sbi->segment_count[i];
77 si->block_count[i] = sbi->block_count[i];
78 }
79}
80
81/*
82 * This function calculates BDF of every segments
83 */
84static void update_sit_info(struct f2fs_sb_info *sbi)
85{
86 struct f2fs_stat_info *si = F2FS_STAT(sbi);
87 unsigned int blks_per_sec, hblks_per_sec, total_vblocks, bimodal, dist;
88 struct sit_info *sit_i = SIT_I(sbi);
89 unsigned int segno, vblocks;
90 int ndirty = 0;
91
92 bimodal = 0;
93 total_vblocks = 0;
94 blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
95 hblks_per_sec = blks_per_sec / 2;
96 mutex_lock(&sit_i->sentry_lock);
97 for (segno = 0; segno < TOTAL_SEGS(sbi); segno += sbi->segs_per_sec) {
98 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
99 dist = abs(vblocks - hblks_per_sec);
100 bimodal += dist * dist;
101
102 if (vblocks > 0 && vblocks < blks_per_sec) {
103 total_vblocks += vblocks;
104 ndirty++;
105 }
106 }
107 mutex_unlock(&sit_i->sentry_lock);
108 dist = TOTAL_SECS(sbi) * hblks_per_sec * hblks_per_sec / 100;
109 si->bimodal = bimodal / dist;
110 if (si->dirty_count)
111 si->avg_vblocks = total_vblocks / ndirty;
112 else
113 si->avg_vblocks = 0;
114}
115
116/*
117 * This function calculates memory footprint.
118 */
119static void update_mem_info(struct f2fs_sb_info *sbi)
120{
121 struct f2fs_stat_info *si = F2FS_STAT(sbi);
122 unsigned npages;
123
124 if (si->base_mem)
125 goto get_cache;
126
127 si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
128 si->base_mem += 2 * sizeof(struct f2fs_inode_info);
129 si->base_mem += sizeof(*sbi->ckpt);
130
131 /* build sm */
132 si->base_mem += sizeof(struct f2fs_sm_info);
133
134 /* build sit */
135 si->base_mem += sizeof(struct sit_info);
136 si->base_mem += TOTAL_SEGS(sbi) * sizeof(struct seg_entry);
137 si->base_mem += f2fs_bitmap_size(TOTAL_SEGS(sbi));
138 si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * TOTAL_SEGS(sbi);
139 if (sbi->segs_per_sec > 1)
140 si->base_mem += TOTAL_SECS(sbi) * sizeof(struct sec_entry);
141 si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
142
143 /* build free segmap */
144 si->base_mem += sizeof(struct free_segmap_info);
145 si->base_mem += f2fs_bitmap_size(TOTAL_SEGS(sbi));
146 si->base_mem += f2fs_bitmap_size(TOTAL_SECS(sbi));
147
148 /* build curseg */
149 si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
150 si->base_mem += PAGE_CACHE_SIZE * NR_CURSEG_TYPE;
151
152 /* build dirty segmap */
153 si->base_mem += sizeof(struct dirty_seglist_info);
154 si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(TOTAL_SEGS(sbi));
155 si->base_mem += f2fs_bitmap_size(TOTAL_SECS(sbi));
156
157 /* buld nm */
158 si->base_mem += sizeof(struct f2fs_nm_info);
159 si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
160
161 /* build gc */
162 si->base_mem += sizeof(struct f2fs_gc_kthread);
163
164get_cache:
165 /* free nids */
166 si->cache_mem = NM_I(sbi)->fcnt;
167 si->cache_mem += NM_I(sbi)->nat_cnt;
168 npages = sbi->node_inode->i_mapping->nrpages;
169 si->cache_mem += npages << PAGE_CACHE_SHIFT;
170 npages = sbi->meta_inode->i_mapping->nrpages;
171 si->cache_mem += npages << PAGE_CACHE_SHIFT;
172 si->cache_mem += sbi->n_orphans * sizeof(struct orphan_inode_entry);
173 si->cache_mem += sbi->n_dirty_dirs * sizeof(struct dir_inode_entry);
174}
175
176static int stat_show(struct seq_file *s, void *v)
177{
178 struct f2fs_stat_info *si;
179 int i = 0;
180 int j;
181
182 mutex_lock(&f2fs_stat_mutex);
183 list_for_each_entry(si, &f2fs_stat_list, stat_list) {
184 char devname[BDEVNAME_SIZE];
185
186 update_general_status(si->sbi);
187
188 seq_printf(s, "\n=====[ partition info(%s). #%d ]=====\n",
189 bdevname(si->sbi->sb->s_bdev, devname), i++);
190 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
191 si->sit_area_segs, si->nat_area_segs);
192 seq_printf(s, "[SSA: %d] [MAIN: %d",
193 si->ssa_area_segs, si->main_area_segs);
194 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
195 si->overp_segs, si->rsvd_segs);
196 seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
197 si->utilization, si->valid_count);
198 seq_printf(s, " - Node: %u (Inode: %u, ",
199 si->valid_node_count, si->valid_inode_count);
200 seq_printf(s, "Other: %u)\n - Data: %u\n",
201 si->valid_node_count - si->valid_inode_count,
202 si->valid_count - si->valid_node_count);
203 seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
204 si->main_area_segs, si->main_area_sections,
205 si->main_area_zones);
206 seq_printf(s, " - COLD data: %d, %d, %d\n",
207 si->curseg[CURSEG_COLD_DATA],
208 si->cursec[CURSEG_COLD_DATA],
209 si->curzone[CURSEG_COLD_DATA]);
210 seq_printf(s, " - WARM data: %d, %d, %d\n",
211 si->curseg[CURSEG_WARM_DATA],
212 si->cursec[CURSEG_WARM_DATA],
213 si->curzone[CURSEG_WARM_DATA]);
214 seq_printf(s, " - HOT data: %d, %d, %d\n",
215 si->curseg[CURSEG_HOT_DATA],
216 si->cursec[CURSEG_HOT_DATA],
217 si->curzone[CURSEG_HOT_DATA]);
218 seq_printf(s, " - Dir dnode: %d, %d, %d\n",
219 si->curseg[CURSEG_HOT_NODE],
220 si->cursec[CURSEG_HOT_NODE],
221 si->curzone[CURSEG_HOT_NODE]);
222 seq_printf(s, " - File dnode: %d, %d, %d\n",
223 si->curseg[CURSEG_WARM_NODE],
224 si->cursec[CURSEG_WARM_NODE],
225 si->curzone[CURSEG_WARM_NODE]);
226 seq_printf(s, " - Indir nodes: %d, %d, %d\n",
227 si->curseg[CURSEG_COLD_NODE],
228 si->cursec[CURSEG_COLD_NODE],
229 si->curzone[CURSEG_COLD_NODE]);
230 seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
231 si->main_area_segs - si->dirty_count -
232 si->prefree_count - si->free_segs,
233 si->dirty_count);
234 seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
235 si->prefree_count, si->free_segs, si->free_secs);
236 seq_printf(s, "GC calls: %d (BG: %d)\n",
237 si->call_count, si->bg_gc);
238 seq_printf(s, " - data segments : %d\n", si->data_segs);
239 seq_printf(s, " - node segments : %d\n", si->node_segs);
240 seq_printf(s, "Try to move %d blocks\n", si->tot_blks);
241 seq_printf(s, " - data blocks : %d\n", si->data_blks);
242 seq_printf(s, " - node blocks : %d\n", si->node_blks);
243 seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
244 si->hit_ext, si->total_ext);
245 seq_printf(s, "\nBalancing F2FS Async:\n");
246 seq_printf(s, " - nodes %4d in %4d\n",
247 si->ndirty_node, si->node_pages);
248 seq_printf(s, " - dents %4d in dirs:%4d\n",
249 si->ndirty_dent, si->ndirty_dirs);
250 seq_printf(s, " - meta %4d in %4d\n",
251 si->ndirty_meta, si->meta_pages);
252 seq_printf(s, " - NATs %5d > %lu\n",
253 si->nats, NM_WOUT_THRESHOLD);
254 seq_printf(s, " - SITs: %5d\n - free_nids: %5d\n",
255 si->sits, si->fnids);
256 seq_puts(s, "\nDistribution of User Blocks:");
257 seq_puts(s, " [ valid | invalid | free ]\n");
258 seq_puts(s, " [");
259
260 for (j = 0; j < si->util_valid; j++)
261 seq_putc(s, '-');
262 seq_putc(s, '|');
263
264 for (j = 0; j < si->util_invalid; j++)
265 seq_putc(s, '-');
266 seq_putc(s, '|');
267
268 for (j = 0; j < si->util_free; j++)
269 seq_putc(s, '-');
270 seq_puts(s, "]\n\n");
271 seq_printf(s, "SSR: %u blocks in %u segments\n",
272 si->block_count[SSR], si->segment_count[SSR]);
273 seq_printf(s, "LFS: %u blocks in %u segments\n",
274 si->block_count[LFS], si->segment_count[LFS]);
275
276 /* segment usage info */
277 update_sit_info(si->sbi);
278 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
279 si->bimodal, si->avg_vblocks);
280
281 /* memory footprint */
282 update_mem_info(si->sbi);
283 seq_printf(s, "\nMemory: %u KB = static: %u + cached: %u\n",
284 (si->base_mem + si->cache_mem) >> 10,
285 si->base_mem >> 10, si->cache_mem >> 10);
286 }
287 mutex_unlock(&f2fs_stat_mutex);
288 return 0;
289}
290
291static int stat_open(struct inode *inode, struct file *file)
292{
293 return single_open(file, stat_show, inode->i_private);
294}
295
296static const struct file_operations stat_fops = {
297 .open = stat_open,
298 .read = seq_read,
299 .llseek = seq_lseek,
300 .release = single_release,
301};
302
303int f2fs_build_stats(struct f2fs_sb_info *sbi)
304{
305 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
306 struct f2fs_stat_info *si;
307
308 si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
309 if (!si)
310 return -ENOMEM;
311
312 si->all_area_segs = le32_to_cpu(raw_super->segment_count);
313 si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
314 si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
315 si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
316 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
317 si->main_area_sections = le32_to_cpu(raw_super->section_count);
318 si->main_area_zones = si->main_area_sections /
319 le32_to_cpu(raw_super->secs_per_zone);
320 si->sbi = sbi;
321 sbi->stat_info = si;
322
323 mutex_lock(&f2fs_stat_mutex);
324 list_add_tail(&si->stat_list, &f2fs_stat_list);
325 mutex_unlock(&f2fs_stat_mutex);
326
327 return 0;
328}
329
330void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
331{
332 struct f2fs_stat_info *si = F2FS_STAT(sbi);
333
334 mutex_lock(&f2fs_stat_mutex);
335 list_del(&si->stat_list);
336 mutex_unlock(&f2fs_stat_mutex);
337
338 kfree(si);
339}
340
341void __init f2fs_create_root_stats(void)
342{
343 debugfs_root = debugfs_create_dir("f2fs", NULL);
344 if (debugfs_root)
345 debugfs_create_file("status", S_IRUGO, debugfs_root,
346 NULL, &stat_fops);
347}
348
349void f2fs_destroy_root_stats(void)
350{
351 debugfs_remove_recursive(debugfs_root);
352 debugfs_root = NULL;
353}