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Jaegeuk Kim0a8165d2012-11-29 13:28:09 +09001/*
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +09002 * 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/proc_fs.h>
17#include <linux/f2fs_fs.h>
18#include <linux/blkdev.h>
19#include <linux/debugfs.h>
20#include <linux/seq_file.h>
21
22#include "f2fs.h"
23#include "node.h"
24#include "segment.h"
25#include "gc.h"
26
27static LIST_HEAD(f2fs_stat_list);
28static struct dentry *debugfs_root;
majianpeng66af62c2013-01-14 20:08:16 +080029static DEFINE_MUTEX(f2fs_stat_mutex);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +090030
Jaegeuk Kim25ca9232012-11-28 16:12:41 +090031static void update_general_status(struct f2fs_sb_info *sbi)
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +090032{
33 struct f2fs_stat_info *si = sbi->stat_info;
34 int i;
35
36 /* valid check of the segment numbers */
37 si->hit_ext = sbi->read_hit_ext;
38 si->total_ext = sbi->total_hit_ext;
39 si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
40 si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
41 si->ndirty_dirs = sbi->n_dirty_dirs;
42 si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
43 si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
44 si->rsvd_segs = reserved_segments(sbi);
45 si->overp_segs = overprovision_segments(sbi);
46 si->valid_count = valid_user_blocks(sbi);
47 si->valid_node_count = valid_node_count(sbi);
48 si->valid_inode_count = valid_inode_count(sbi);
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 = sbi->node_inode->i_mapping->nrpages;
56 si->meta_pages = sbi->meta_inode->i_mapping->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
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +090082/*
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +090083 * This function calculates BDF of every segments
84 */
85static void update_sit_info(struct f2fs_sb_info *sbi)
86{
87 struct f2fs_stat_info *si = sbi->stat_info;
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);
Jaegeuk Kim53cf9522013-03-31 12:39:49 +0900109 dist = TOTAL_SECS(sbi) * hblks_per_sec * hblks_per_sec / 100;
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900110 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
Jaegeuk Kim0a8165d2012-11-29 13:28:09 +0900117/*
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900118 * This function calculates memory footprint.
119 */
120static void update_mem_info(struct f2fs_sb_info *sbi)
121{
122 struct f2fs_stat_info *si = sbi->stat_info;
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)
Jaegeuk Kim53cf9522013-03-31 12:39:49 +0900141 si->base_mem += TOTAL_SECS(sbi) * sizeof(struct sec_entry);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900142 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));
Jaegeuk Kim53cf9522013-03-31 12:39:49 +0900147 si->base_mem += f2fs_bitmap_size(TOTAL_SECS(sbi));
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900148
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 += 2 * f2fs_bitmap_size(TOTAL_SEGS(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
165get_cache:
166 /* free nids */
167 si->cache_mem = NM_I(sbi)->fcnt;
168 si->cache_mem += NM_I(sbi)->nat_cnt;
169 npages = sbi->node_inode->i_mapping->nrpages;
170 si->cache_mem += npages << PAGE_CACHE_SHIFT;
171 npages = sbi->meta_inode->i_mapping->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
177static int stat_show(struct seq_file *s, void *v)
178{
179 struct f2fs_stat_info *si, *next;
180 int i = 0;
181 int j;
182
majianpeng66af62c2013-01-14 20:08:16 +0800183 mutex_lock(&f2fs_stat_mutex);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900184 list_for_each_entry_safe(si, next, &f2fs_stat_list, stat_list) {
majianpengf83759e2013-02-01 15:00:30 +0800185 char devname[BDEVNAME_SIZE];
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900186
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900187 update_general_status(si->sbi);
188
majianpengf83759e2013-02-01 15:00:30 +0800189 seq_printf(s, "\n=====[ partition info(%s). #%d ]=====\n",
190 bdevname(si->sbi->sb->s_bdev, devname), i++);
Huajun Li7880cee2012-12-31 13:59:09 +0800191 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
192 si->sit_area_segs, si->nat_area_segs);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900193 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, "\nMain area: %d segs, %d secs %d zones\n",
205 si->main_area_segs, si->main_area_sections,
206 si->main_area_zones);
207 seq_printf(s, " - COLD data: %d, %d, %d\n",
208 si->curseg[CURSEG_COLD_DATA],
209 si->cursec[CURSEG_COLD_DATA],
210 si->curzone[CURSEG_COLD_DATA]);
211 seq_printf(s, " - WARM data: %d, %d, %d\n",
212 si->curseg[CURSEG_WARM_DATA],
213 si->cursec[CURSEG_WARM_DATA],
214 si->curzone[CURSEG_WARM_DATA]);
215 seq_printf(s, " - HOT data: %d, %d, %d\n",
216 si->curseg[CURSEG_HOT_DATA],
217 si->cursec[CURSEG_HOT_DATA],
218 si->curzone[CURSEG_HOT_DATA]);
219 seq_printf(s, " - Dir dnode: %d, %d, %d\n",
220 si->curseg[CURSEG_HOT_NODE],
221 si->cursec[CURSEG_HOT_NODE],
222 si->curzone[CURSEG_HOT_NODE]);
223 seq_printf(s, " - File dnode: %d, %d, %d\n",
224 si->curseg[CURSEG_WARM_NODE],
225 si->cursec[CURSEG_WARM_NODE],
226 si->curzone[CURSEG_WARM_NODE]);
227 seq_printf(s, " - Indir nodes: %d, %d, %d\n",
228 si->curseg[CURSEG_COLD_NODE],
229 si->cursec[CURSEG_COLD_NODE],
230 si->curzone[CURSEG_COLD_NODE]);
231 seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
232 si->main_area_segs - si->dirty_count -
233 si->prefree_count - si->free_segs,
234 si->dirty_count);
235 seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
236 si->prefree_count, si->free_segs, si->free_secs);
237 seq_printf(s, "GC calls: %d (BG: %d)\n",
238 si->call_count, si->bg_gc);
239 seq_printf(s, " - data segments : %d\n", si->data_segs);
240 seq_printf(s, " - node segments : %d\n", si->node_segs);
241 seq_printf(s, "Try to move %d blocks\n", si->tot_blks);
242 seq_printf(s, " - data blocks : %d\n", si->data_blks);
243 seq_printf(s, " - node blocks : %d\n", si->node_blks);
244 seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
245 si->hit_ext, si->total_ext);
246 seq_printf(s, "\nBalancing F2FS Async:\n");
247 seq_printf(s, " - nodes %4d in %4d\n",
248 si->ndirty_node, si->node_pages);
249 seq_printf(s, " - dents %4d in dirs:%4d\n",
250 si->ndirty_dent, si->ndirty_dirs);
251 seq_printf(s, " - meta %4d in %4d\n",
252 si->ndirty_meta, si->meta_pages);
253 seq_printf(s, " - NATs %5d > %lu\n",
254 si->nats, NM_WOUT_THRESHOLD);
255 seq_printf(s, " - SITs: %5d\n - free_nids: %5d\n",
256 si->sits, si->fnids);
257 seq_printf(s, "\nDistribution of User Blocks:");
258 seq_printf(s, " [ valid | invalid | free ]\n");
259 seq_printf(s, " [");
260
261 for (j = 0; j < si->util_valid; j++)
262 seq_printf(s, "-");
263 seq_printf(s, "|");
264
265 for (j = 0; j < si->util_invalid; j++)
266 seq_printf(s, "-");
267 seq_printf(s, "|");
268
269 for (j = 0; j < si->util_free; j++)
270 seq_printf(s, "-");
271 seq_printf(s, "]\n\n");
272 seq_printf(s, "SSR: %u blocks in %u segments\n",
273 si->block_count[SSR], si->segment_count[SSR]);
274 seq_printf(s, "LFS: %u blocks in %u segments\n",
275 si->block_count[LFS], si->segment_count[LFS]);
276
277 /* segment usage info */
278 update_sit_info(si->sbi);
279 seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
280 si->bimodal, si->avg_vblocks);
281
282 /* memory footprint */
283 update_mem_info(si->sbi);
284 seq_printf(s, "\nMemory: %u KB = static: %u + cached: %u\n",
285 (si->base_mem + si->cache_mem) >> 10,
286 si->base_mem >> 10, si->cache_mem >> 10);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900287 }
majianpeng66af62c2013-01-14 20:08:16 +0800288 mutex_unlock(&f2fs_stat_mutex);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900289 return 0;
290}
291
292static int stat_open(struct inode *inode, struct file *file)
293{
294 return single_open(file, stat_show, inode->i_private);
295}
296
297static const struct file_operations stat_fops = {
298 .open = stat_open,
299 .read = seq_read,
300 .llseek = seq_lseek,
301 .release = single_release,
302};
303
Namjae Jeon4589d252013-01-15 19:58:47 +0900304int f2fs_build_stats(struct f2fs_sb_info *sbi)
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900305{
306 struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
307 struct f2fs_stat_info *si;
308
309 sbi->stat_info = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
310 if (!sbi->stat_info)
311 return -ENOMEM;
312
313 si = sbi->stat_info;
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900314 si->all_area_segs = le32_to_cpu(raw_super->segment_count);
315 si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
316 si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
317 si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
318 si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
319 si->main_area_sections = le32_to_cpu(raw_super->section_count);
320 si->main_area_zones = si->main_area_sections /
321 le32_to_cpu(raw_super->secs_per_zone);
322 si->sbi = sbi;
majianpeng66af62c2013-01-14 20:08:16 +0800323
324 mutex_lock(&f2fs_stat_mutex);
325 list_add_tail(&si->stat_list, &f2fs_stat_list);
326 mutex_unlock(&f2fs_stat_mutex);
327
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900328 return 0;
329}
330
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900331void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
332{
333 struct f2fs_stat_info *si = sbi->stat_info;
334
majianpeng66af62c2013-01-14 20:08:16 +0800335 mutex_lock(&f2fs_stat_mutex);
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900336 list_del(&si->stat_list);
majianpeng66af62c2013-01-14 20:08:16 +0800337 mutex_unlock(&f2fs_stat_mutex);
338
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900339 kfree(sbi->stat_info);
340}
341
Namjae Jeon4589d252013-01-15 19:58:47 +0900342void __init f2fs_create_root_stats(void)
343{
344 debugfs_root = debugfs_create_dir("f2fs", NULL);
345 if (debugfs_root)
346 debugfs_create_file("status", S_IRUGO, debugfs_root,
347 NULL, &stat_fops);
348}
349
350void f2fs_destroy_root_stats(void)
Greg Kroah-Hartman902829a2012-11-03 06:50:41 +0900351{
352 debugfs_remove_recursive(debugfs_root);
353 debugfs_root = NULL;
354}