fs/f2fs/iostat.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * Copyright 2021 Google LLC
0004  * Author: Daeho Jeong <daehojeong@google.com>
0005  */
0006 #ifndef __F2FS_IOSTAT_H__
0007 #define __F2FS_IOSTAT_H__
0008
0009 struct bio_post_read_ctx;
0010
0011 #ifdef CONFIG_F2FS_IOSTAT
0012
0013 #define DEFAULT_IOSTAT_PERIOD_MS    3000
0014 #define MIN_IOSTAT_PERIOD_MS        100
0015 /* maximum period of iostat tracing is 1 day */
0016 #define MAX_IOSTAT_PERIOD_MS        8640000
0017
0018 enum {
0019     READ_IO,
0020     WRITE_SYNC_IO,
0021     WRITE_ASYNC_IO,
0022     MAX_IO_TYPE,
0023 };
0024
0025 struct iostat_lat_info {
0026     unsigned long sum_lat[MAX_IO_TYPE][NR_PAGE_TYPE];   /* sum of io latencies */
0027     unsigned long peak_lat[MAX_IO_TYPE][NR_PAGE_TYPE];  /* peak io latency */
0028     unsigned int bio_cnt[MAX_IO_TYPE][NR_PAGE_TYPE];    /* bio count */
0029 };
0030
0031 extern int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
0032             void *offset);
0033 extern void f2fs_reset_iostat(struct f2fs_sb_info *sbi);
0034 extern void f2fs_update_iostat(struct f2fs_sb_info *sbi,
0035             enum iostat_type type, unsigned long long io_bytes);
0036
0037 struct bio_iostat_ctx {
0038     struct f2fs_sb_info *sbi;
0039     unsigned long submit_ts;
0040     enum page_type type;
0041     struct bio_post_read_ctx *post_read_ctx;
0042 };
0043
0044 static inline void iostat_update_submit_ctx(struct bio *bio,
0045             enum page_type type)
0046 {
0047     struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
0048
0049     iostat_ctx->submit_ts = jiffies;
0050     iostat_ctx->type = type;
0051 }
0052
0053 static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
0054 {
0055     struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
0056
0057     return iostat_ctx->post_read_ctx;
0058 }
0059
0060 extern void iostat_update_and_unbind_ctx(struct bio *bio, int rw);
0061 extern void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
0062         struct bio *bio, struct bio_post_read_ctx *ctx);
0063 extern int f2fs_init_iostat_processing(void);
0064 extern void f2fs_destroy_iostat_processing(void);
0065 extern int f2fs_init_iostat(struct f2fs_sb_info *sbi);
0066 extern void f2fs_destroy_iostat(struct f2fs_sb_info *sbi);
0067 #else
0068 static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi,
0069         enum iostat_type type, unsigned long long io_bytes) {}
0070 static inline void iostat_update_and_unbind_ctx(struct bio *bio, int rw) {}
0071 static inline void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
0072         struct bio *bio, struct bio_post_read_ctx *ctx) {}
0073 static inline void iostat_update_submit_ctx(struct bio *bio,
0074         enum page_type type) {}
0075 static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
0076 {
0077     return bio->bi_private;
0078 }
0079 static inline int f2fs_init_iostat_processing(void) { return 0; }
0080 static inline void f2fs_destroy_iostat_processing(void) {}
0081 static inline int f2fs_init_iostat(struct f2fs_sb_info *sbi) { return 0; }
0082 static inline void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) {}
0083 #endif
0084 #endif /* __F2FS_IOSTAT_H__ */