1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright 2021 Google LLC
4 * Author: Daeho Jeong <daehojeong@google.com>
5 */
6 #ifndef __F2FS_IOSTAT_H__
7 #define __F2FS_IOSTAT_H__
8
9 struct bio_post_read_ctx;
10
11 enum iostat_lat_type {
12 READ_IO = 0,
13 WRITE_SYNC_IO,
14 WRITE_ASYNC_IO,
15 MAX_IO_TYPE,
16 };
17
18 #ifdef CONFIG_F2FS_IOSTAT
19
20 #define NUM_PREALLOC_IOSTAT_CTXS 128
21 #define DEFAULT_IOSTAT_PERIOD_MS 3000
22 #define MIN_IOSTAT_PERIOD_MS 100
23 /* maximum period of iostat tracing is 1 day */
24 #define MAX_IOSTAT_PERIOD_MS 8640000
25
26 struct iostat_lat_info {
27 unsigned long sum_lat[MAX_IO_TYPE][NR_PAGE_TYPE]; /* sum of io latencies */
28 unsigned long peak_lat[MAX_IO_TYPE][NR_PAGE_TYPE]; /* peak io latency */
29 unsigned int bio_cnt[MAX_IO_TYPE][NR_PAGE_TYPE]; /* bio count */
30 };
31
32 extern int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
33 void *offset);
34 extern void f2fs_reset_iostat(struct f2fs_sb_info *sbi);
35 extern void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
36 enum iostat_type type, unsigned long long io_bytes);
37
38 struct bio_iostat_ctx {
39 struct f2fs_sb_info *sbi;
40 unsigned long submit_ts;
41 enum page_type type;
42 struct bio_post_read_ctx *post_read_ctx;
43 };
44
45 static inline void iostat_update_submit_ctx(struct bio *bio,
46 enum page_type type)
47 {
48 struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
49
50 iostat_ctx->submit_ts = jiffies;
51 iostat_ctx->type = type;
52 }
53
54 static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
55 {
56 struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
57
58 return iostat_ctx->post_read_ctx;
59 }
60
61 extern void iostat_update_and_unbind_ctx(struct bio *bio);
62 extern void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
63 struct bio *bio, struct bio_post_read_ctx *ctx);
64 extern int f2fs_init_iostat_processing(void);
65 extern void f2fs_destroy_iostat_processing(void);
66 extern int f2fs_init_iostat(struct f2fs_sb_info *sbi);
67 extern void f2fs_destroy_iostat(struct f2fs_sb_info *sbi);
68 #else
69 static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
70 enum iostat_type type, unsigned long long io_bytes) {}
71 static inline void iostat_update_and_unbind_ctx(struct bio *bio) {}
72 static inline void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
73 struct bio *bio, struct bio_post_read_ctx *ctx) {}
74 static inline void iostat_update_submit_ctx(struct bio *bio,
75 enum page_type type) {}
76 static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
77 {
78 return bio->bi_private;
79 }
80 static inline int f2fs_init_iostat_processing(void) { return 0; }
81 static inline void f2fs_destroy_iostat_processing(void) {}
82 static inline int f2fs_init_iostat(struct f2fs_sb_info *sbi) { return 0; }
83 static inline void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) {}
84 #endif
85 #endif /* __F2FS_IOSTAT_H__ */
86
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.