xref: /linux/fs/f2fs/debug.c (revision c4ee0af3fa0dc65f690fc908f02b8355f9576ea0)
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 *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->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  */
84 static 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  */
119 static 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 
164 get_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 
176 static 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 
291 static int stat_open(struct inode *inode, struct file *file)
292 {
293 	return single_open(file, stat_show, inode->i_private);
294 }
295 
296 static const struct file_operations stat_fops = {
297 	.open = stat_open,
298 	.read = seq_read,
299 	.llseek = seq_lseek,
300 	.release = single_release,
301 };
302 
303 int 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 
330 void 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 
341 void __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 
349 void f2fs_destroy_root_stats(void)
350 {
351 	debugfs_remove_recursive(debugfs_root);
352 	debugfs_root = NULL;
353 }
354