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9#include <linux/fs.h>
10#include <linux/f2fs_fs.h>
11#include <linux/seq_file.h>
12
13#include "f2fs.h"
14#include "iostat.h"
15#include <trace/events/f2fs.h>
16
17#define NUM_PREALLOC_IOSTAT_CTXS 128
18static struct kmem_cache *bio_iostat_ctx_cache;
19static mempool_t *bio_iostat_ctx_pool;
20
21int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
22{
23 struct super_block *sb = seq->private;
24 struct f2fs_sb_info *sbi = F2FS_SB(sb);
25 time64_t now = ktime_get_real_seconds();
26
27 if (!sbi->iostat_enable)
28 return 0;
29
30 seq_printf(seq, "time: %-16llu\n", now);
31
32
33 seq_puts(seq, "[WRITE]\n");
34 seq_printf(seq, "app buffered: %-16llu\n",
35 sbi->rw_iostat[APP_BUFFERED_IO]);
36 seq_printf(seq, "app direct: %-16llu\n",
37 sbi->rw_iostat[APP_DIRECT_IO]);
38 seq_printf(seq, "app mapped: %-16llu\n",
39 sbi->rw_iostat[APP_MAPPED_IO]);
40
41
42 seq_printf(seq, "fs data: %-16llu\n",
43 sbi->rw_iostat[FS_DATA_IO]);
44 seq_printf(seq, "fs node: %-16llu\n",
45 sbi->rw_iostat[FS_NODE_IO]);
46 seq_printf(seq, "fs meta: %-16llu\n",
47 sbi->rw_iostat[FS_META_IO]);
48 seq_printf(seq, "fs gc data: %-16llu\n",
49 sbi->rw_iostat[FS_GC_DATA_IO]);
50 seq_printf(seq, "fs gc node: %-16llu\n",
51 sbi->rw_iostat[FS_GC_NODE_IO]);
52 seq_printf(seq, "fs cp data: %-16llu\n",
53 sbi->rw_iostat[FS_CP_DATA_IO]);
54 seq_printf(seq, "fs cp node: %-16llu\n",
55 sbi->rw_iostat[FS_CP_NODE_IO]);
56 seq_printf(seq, "fs cp meta: %-16llu\n",
57 sbi->rw_iostat[FS_CP_META_IO]);
58
59
60 seq_puts(seq, "[READ]\n");
61 seq_printf(seq, "app buffered: %-16llu\n",
62 sbi->rw_iostat[APP_BUFFERED_READ_IO]);
63 seq_printf(seq, "app direct: %-16llu\n",
64 sbi->rw_iostat[APP_DIRECT_READ_IO]);
65 seq_printf(seq, "app mapped: %-16llu\n",
66 sbi->rw_iostat[APP_MAPPED_READ_IO]);
67
68
69 seq_printf(seq, "fs data: %-16llu\n",
70 sbi->rw_iostat[FS_DATA_READ_IO]);
71 seq_printf(seq, "fs gc data: %-16llu\n",
72 sbi->rw_iostat[FS_GDATA_READ_IO]);
73 seq_printf(seq, "fs compr_data: %-16llu\n",
74 sbi->rw_iostat[FS_CDATA_READ_IO]);
75 seq_printf(seq, "fs node: %-16llu\n",
76 sbi->rw_iostat[FS_NODE_READ_IO]);
77 seq_printf(seq, "fs meta: %-16llu\n",
78 sbi->rw_iostat[FS_META_READ_IO]);
79
80
81 seq_puts(seq, "[OTHER]\n");
82 seq_printf(seq, "fs discard: %-16llu\n",
83 sbi->rw_iostat[FS_DISCARD]);
84
85 return 0;
86}
87
88static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
89{
90 int io, idx = 0;
91 unsigned int cnt;
92 struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE];
93 struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
94
95 spin_lock_irq(&sbi->iostat_lat_lock);
96 for (idx = 0; idx < MAX_IO_TYPE; idx++) {
97 for (io = 0; io < NR_PAGE_TYPE; io++) {
98 cnt = io_lat->bio_cnt[idx][io];
99 iostat_lat[idx][io].peak_lat =
100 jiffies_to_msecs(io_lat->peak_lat[idx][io]);
101 iostat_lat[idx][io].cnt = cnt;
102 iostat_lat[idx][io].avg_lat = cnt ?
103 jiffies_to_msecs(io_lat->sum_lat[idx][io]) / cnt : 0;
104 io_lat->sum_lat[idx][io] = 0;
105 io_lat->peak_lat[idx][io] = 0;
106 io_lat->bio_cnt[idx][io] = 0;
107 }
108 }
109 spin_unlock_irq(&sbi->iostat_lat_lock);
110
111 trace_f2fs_iostat_latency(sbi, iostat_lat);
112}
113
114static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi)
115{
116 unsigned long long iostat_diff[NR_IO_TYPE];
117 int i;
118
119 if (time_is_after_jiffies(sbi->iostat_next_period))
120 return;
121
122
123 spin_lock(&sbi->iostat_lock);
124 if (time_is_after_jiffies(sbi->iostat_next_period)) {
125 spin_unlock(&sbi->iostat_lock);
126 return;
127 }
128 sbi->iostat_next_period = jiffies +
129 msecs_to_jiffies(sbi->iostat_period_ms);
130
131 for (i = 0; i < NR_IO_TYPE; i++) {
132 iostat_diff[i] = sbi->rw_iostat[i] -
133 sbi->prev_rw_iostat[i];
134 sbi->prev_rw_iostat[i] = sbi->rw_iostat[i];
135 }
136 spin_unlock(&sbi->iostat_lock);
137
138 trace_f2fs_iostat(sbi, iostat_diff);
139
140 __record_iostat_latency(sbi);
141}
142
143void f2fs_reset_iostat(struct f2fs_sb_info *sbi)
144{
145 struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
146 int i;
147
148 spin_lock(&sbi->iostat_lock);
149 for (i = 0; i < NR_IO_TYPE; i++) {
150 sbi->rw_iostat[i] = 0;
151 sbi->prev_rw_iostat[i] = 0;
152 }
153 spin_unlock(&sbi->iostat_lock);
154
155 spin_lock_irq(&sbi->iostat_lat_lock);
156 memset(io_lat, 0, sizeof(struct iostat_lat_info));
157 spin_unlock_irq(&sbi->iostat_lat_lock);
158}
159
160void f2fs_update_iostat(struct f2fs_sb_info *sbi,
161 enum iostat_type type, unsigned long long io_bytes)
162{
163 if (!sbi->iostat_enable)
164 return;
165
166 spin_lock(&sbi->iostat_lock);
167 sbi->rw_iostat[type] += io_bytes;
168
169 if (type == APP_WRITE_IO || type == APP_DIRECT_IO)
170 sbi->rw_iostat[APP_BUFFERED_IO] =
171 sbi->rw_iostat[APP_WRITE_IO] -
172 sbi->rw_iostat[APP_DIRECT_IO];
173
174 if (type == APP_READ_IO || type == APP_DIRECT_READ_IO)
175 sbi->rw_iostat[APP_BUFFERED_READ_IO] =
176 sbi->rw_iostat[APP_READ_IO] -
177 sbi->rw_iostat[APP_DIRECT_READ_IO];
178 spin_unlock(&sbi->iostat_lock);
179
180 f2fs_record_iostat(sbi);
181}
182
183static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx,
184 int rw, bool is_sync)
185{
186 unsigned long ts_diff;
187 unsigned int iotype = iostat_ctx->type;
188 unsigned long flags;
189 struct f2fs_sb_info *sbi = iostat_ctx->sbi;
190 struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
191 int idx;
192
193 if (!sbi->iostat_enable)
194 return;
195
196 ts_diff = jiffies - iostat_ctx->submit_ts;
197 if (iotype >= META_FLUSH)
198 iotype = META;
199
200 if (rw == 0) {
201 idx = READ_IO;
202 } else {
203 if (is_sync)
204 idx = WRITE_SYNC_IO;
205 else
206 idx = WRITE_ASYNC_IO;
207 }
208
209 spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
210 io_lat->sum_lat[idx][iotype] += ts_diff;
211 io_lat->bio_cnt[idx][iotype]++;
212 if (ts_diff > io_lat->peak_lat[idx][iotype])
213 io_lat->peak_lat[idx][iotype] = ts_diff;
214 spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags);
215}
216
217void iostat_update_and_unbind_ctx(struct bio *bio, int rw)
218{
219 struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
220 bool is_sync = bio->bi_opf & REQ_SYNC;
221
222 if (rw == 0)
223 bio->bi_private = iostat_ctx->post_read_ctx;
224 else
225 bio->bi_private = iostat_ctx->sbi;
226 __update_iostat_latency(iostat_ctx, rw, is_sync);
227 mempool_free(iostat_ctx, bio_iostat_ctx_pool);
228}
229
230void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
231 struct bio *bio, struct bio_post_read_ctx *ctx)
232{
233 struct bio_iostat_ctx *iostat_ctx;
234
235 iostat_ctx = mempool_alloc(bio_iostat_ctx_pool, GFP_NOFS);
236 iostat_ctx->sbi = sbi;
237 iostat_ctx->submit_ts = 0;
238 iostat_ctx->type = 0;
239 iostat_ctx->post_read_ctx = ctx;
240 bio->bi_private = iostat_ctx;
241}
242
243int __init f2fs_init_iostat_processing(void)
244{
245 bio_iostat_ctx_cache =
246 kmem_cache_create("f2fs_bio_iostat_ctx",
247 sizeof(struct bio_iostat_ctx), 0, 0, NULL);
248 if (!bio_iostat_ctx_cache)
249 goto fail;
250 bio_iostat_ctx_pool =
251 mempool_create_slab_pool(NUM_PREALLOC_IOSTAT_CTXS,
252 bio_iostat_ctx_cache);
253 if (!bio_iostat_ctx_pool)
254 goto fail_free_cache;
255 return 0;
256
257fail_free_cache:
258 kmem_cache_destroy(bio_iostat_ctx_cache);
259fail:
260 return -ENOMEM;
261}
262
263void f2fs_destroy_iostat_processing(void)
264{
265 mempool_destroy(bio_iostat_ctx_pool);
266 kmem_cache_destroy(bio_iostat_ctx_cache);
267}
268
269int f2fs_init_iostat(struct f2fs_sb_info *sbi)
270{
271
272 spin_lock_init(&sbi->iostat_lock);
273 spin_lock_init(&sbi->iostat_lat_lock);
274 sbi->iostat_enable = false;
275 sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS;
276 sbi->iostat_io_lat = f2fs_kzalloc(sbi, sizeof(struct iostat_lat_info),
277 GFP_KERNEL);
278 if (!sbi->iostat_io_lat)
279 return -ENOMEM;
280
281 return 0;
282}
283
284void f2fs_destroy_iostat(struct f2fs_sb_info *sbi)
285{
286 kfree(sbi->iostat_io_lat);
287}
288
