diskutil.h revision d09a64a01a6c807596e9286c93f6c6f30fd2ea26 
1#ifndef FIO_DISKUTIL_H
2#define FIO_DISKUTIL_H
3
4#define FIO_DU_NAME_SZ		64
5
6/*
7 * Disk utils as read in /sys/block/<dev>/stat
8 */
9struct disk_util_stat {
10	uint8_t name[FIO_DU_NAME_SZ];
11	uint32_t ios[2];
12	uint32_t merges[2];
13	uint64_t sectors[2];
14	uint32_t ticks[2];
15	uint32_t io_ticks;
16	uint32_t time_in_queue;
17	uint64_t msec;
18};
19
20struct disk_util_agg {
21	uint32_t ios[2];
22	uint32_t merges[2];
23	uint64_t sectors[2];
24	uint32_t ticks[2];
25	uint32_t io_ticks;
26	uint32_t time_in_queue;
27	uint32_t slavecount;
28	fio_fp64_t max_util;
29};
30
31/*
32 * Per-device disk util management
33 */
34struct disk_util {
35	struct flist_head list;
36	/* If this disk is a slave, hook it into the master's
37	 * list using this head.
38	 */
39	struct flist_head slavelist;
40
41	char *name;
42	char *sysfs_root;
43	char path[256];
44	int major, minor;
45
46	struct disk_util_stat dus;
47	struct disk_util_stat last_dus;
48
49	struct disk_util_agg agg;
50
51	/* For software raids, this entry maintains pointers to the
52	 * entries for the slave devices. The disk_util entries for
53	 * the slaves devices should primarily be maintained through
54	 * the disk_list list, i.e. for memory allocation and
55	 * de-allocation, etc. Whereas this list should be used only
56	 * for aggregating a software RAID's disk util figures.
57	 */
58	struct flist_head slaves;
59
60	struct timeval time;
61
62	struct fio_mutex *lock;
63	unsigned long users;
64};
65
66static inline void disk_util_mod(struct disk_util *du, int val)
67{
68	if (du) {
69		struct flist_head *n;
70
71		fio_mutex_down(du->lock);
72		du->users += val;
73
74		flist_for_each(n, &du->slavelist) {
75			struct disk_util *slave;
76
77			slave = flist_entry(n, struct disk_util, slavelist);
78			slave->users += val;
79		}
80		fio_mutex_up(du->lock);
81	}
82}
83static inline void disk_util_inc(struct disk_util *du)
84{
85	disk_util_mod(du, 1);
86}
87
88static inline void disk_util_dec(struct disk_util *du)
89{
90	disk_util_mod(du, -1);
91}
92
93#define DISK_UTIL_MSEC	(250)
94
95extern struct flist_head disk_list;
96
97/*
98 * disk util stuff
99 */
100#ifdef FIO_HAVE_DISK_UTIL
101extern void print_disk_util(struct disk_util_stat *, struct disk_util_agg *);
102extern void show_disk_util(void);
103extern void free_disk_util(void);
104extern void init_disk_util(struct thread_data *);
105extern void update_io_ticks(void);
106#else
107#define print_disk_util(dus, agg)
108#define show_disk_util()
109#define free_disk_util()
110#define init_disk_util(td)
111#define update_io_ticks()
112#endif
113
114#endif
115