f2fs: check the use of macros on block counts and addresses
[linux-3.10.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         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         for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {
97                 vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
98                 dist = abs(vblocks - hblks_per_sec);
99                 bimodal += dist * dist;
100
101                 if (vblocks > 0 && vblocks < blks_per_sec) {
102                         total_vblocks += vblocks;
103                         ndirty++;
104                 }
105         }
106         dist = MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec / 100;
107         si->bimodal = bimodal / dist;
108         if (si->dirty_count)
109                 si->avg_vblocks = total_vblocks / ndirty;
110         else
111                 si->avg_vblocks = 0;
112 }
113
114 /*
115  * This function calculates memory footprint.
116  */
117 static void update_mem_info(struct f2fs_sb_info *sbi)
118 {
119         struct f2fs_stat_info *si = F2FS_STAT(sbi);
120         unsigned npages;
121
122         if (si->base_mem)
123                 goto get_cache;
124
125         si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
126         si->base_mem += 2 * sizeof(struct f2fs_inode_info);
127         si->base_mem += sizeof(*sbi->ckpt);
128
129         /* build sm */
130         si->base_mem += sizeof(struct f2fs_sm_info);
131
132         /* build sit */
133         si->base_mem += sizeof(struct sit_info);
134         si->base_mem += MAIN_SEGS(sbi) * sizeof(struct seg_entry);
135         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
136         si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * MAIN_SEGS(sbi);
137         if (sbi->segs_per_sec > 1)
138                 si->base_mem += MAIN_SECS(sbi) * sizeof(struct sec_entry);
139         si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
140
141         /* build free segmap */
142         si->base_mem += sizeof(struct free_segmap_info);
143         si->base_mem += f2fs_bitmap_size(MAIN_SEGS(sbi));
144         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
145
146         /* build curseg */
147         si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
148         si->base_mem += PAGE_CACHE_SIZE * NR_CURSEG_TYPE;
149
150         /* build dirty segmap */
151         si->base_mem += sizeof(struct dirty_seglist_info);
152         si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(MAIN_SEGS(sbi));
153         si->base_mem += f2fs_bitmap_size(MAIN_SECS(sbi));
154
155         /* buld nm */
156         si->base_mem += sizeof(struct f2fs_nm_info);
157         si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
158
159         /* build gc */
160         si->base_mem += sizeof(struct f2fs_gc_kthread);
161
162 get_cache:
163         /* free nids */
164         si->cache_mem = NM_I(sbi)->fcnt;
165         si->cache_mem += NM_I(sbi)->nat_cnt;
166         npages = NODE_MAPPING(sbi)->nrpages;
167         si->cache_mem += npages << PAGE_CACHE_SHIFT;
168         npages = META_MAPPING(sbi)->nrpages;
169         si->cache_mem += npages << PAGE_CACHE_SHIFT;
170         si->cache_mem += sbi->n_orphans * sizeof(struct ino_entry);
171         si->cache_mem += sbi->n_dirty_dirs * sizeof(struct dir_inode_entry);
172 }
173
174 static int stat_show(struct seq_file *s, void *v)
175 {
176         struct f2fs_stat_info *si;
177         int i = 0;
178         int j;
179
180         mutex_lock(&f2fs_stat_mutex);
181         list_for_each_entry(si, &f2fs_stat_list, stat_list) {
182                 char devname[BDEVNAME_SIZE];
183
184                 update_general_status(si->sbi);
185
186                 seq_printf(s, "\n=====[ partition info(%s). #%d ]=====\n",
187                         bdevname(si->sbi->sb->s_bdev, devname), i++);
188                 seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
189                            si->sit_area_segs, si->nat_area_segs);
190                 seq_printf(s, "[SSA: %d] [MAIN: %d",
191                            si->ssa_area_segs, si->main_area_segs);
192                 seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
193                            si->overp_segs, si->rsvd_segs);
194                 seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
195                            si->utilization, si->valid_count);
196                 seq_printf(s, "  - Node: %u (Inode: %u, ",
197                            si->valid_node_count, si->valid_inode_count);
198                 seq_printf(s, "Other: %u)\n  - Data: %u\n",
199                            si->valid_node_count - si->valid_inode_count,
200                            si->valid_count - si->valid_node_count);
201                 seq_printf(s, "  - Inline_data Inode: %u\n",
202                            si->inline_inode);
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, "CP calls: %d\n", si->cp_count);
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_puts(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: %9d\n  - SITs: %9d\n",
254                            si->nats, si->sits);
255                 seq_printf(s, "  - free_nids: %9d\n",
256                            si->fnids);
257                 seq_puts(s, "\nDistribution of User Blocks:");
258                 seq_puts(s, " [ valid | invalid | free ]\n");
259                 seq_puts(s, "  [");
260
261                 for (j = 0; j < si->util_valid; j++)
262                         seq_putc(s, '-');
263                 seq_putc(s, '|');
264
265                 for (j = 0; j < si->util_invalid; j++)
266                         seq_putc(s, '-');
267                 seq_putc(s, '|');
268
269                 for (j = 0; j < si->util_free; j++)
270                         seq_putc(s, '-');
271                 seq_puts(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);
287         }
288         mutex_unlock(&f2fs_stat_mutex);
289         return 0;
290 }
291
292 static int stat_open(struct inode *inode, struct file *file)
293 {
294         return single_open(file, stat_show, inode->i_private);
295 }
296
297 static const struct file_operations stat_fops = {
298         .open = stat_open,
299         .read = seq_read,
300         .llseek = seq_lseek,
301         .release = single_release,
302 };
303
304 int f2fs_build_stats(struct f2fs_sb_info *sbi)
305 {
306         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
307         struct f2fs_stat_info *si;
308
309         si = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
310         if (!si)
311                 return -ENOMEM;
312
313         si->all_area_segs = le32_to_cpu(raw_super->segment_count);
314         si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
315         si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
316         si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
317         si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
318         si->main_area_sections = le32_to_cpu(raw_super->section_count);
319         si->main_area_zones = si->main_area_sections /
320                                 le32_to_cpu(raw_super->secs_per_zone);
321         si->sbi = sbi;
322         sbi->stat_info = si;
323
324         mutex_lock(&f2fs_stat_mutex);
325         list_add_tail(&si->stat_list, &f2fs_stat_list);
326         mutex_unlock(&f2fs_stat_mutex);
327
328         return 0;
329 }
330
331 void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
332 {
333         struct f2fs_stat_info *si = F2FS_STAT(sbi);
334
335         mutex_lock(&f2fs_stat_mutex);
336         list_del(&si->stat_list);
337         mutex_unlock(&f2fs_stat_mutex);
338
339         kfree(si);
340 }
341
342 void __init f2fs_create_root_stats(void)
343 {
344         struct dentry *file;
345
346         f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);
347         if (!f2fs_debugfs_root)
348                 return;
349
350         file = debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root,
351                         NULL, &stat_fops);
352         if (!file) {
353                 debugfs_remove(f2fs_debugfs_root);
354                 f2fs_debugfs_root = NULL;
355         }
356 }
357
358 void f2fs_destroy_root_stats(void)
359 {
360         if (!f2fs_debugfs_root)
361                 return;
362
363         debugfs_remove_recursive(f2fs_debugfs_root);
364         f2fs_debugfs_root = NULL;
365 }