1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PART_STAT_H
#define _LINUX_PART_STAT_H
#include <linux/genhd.h>
struct disk_stats {
u64 nsecs[NR_STAT_GROUPS];
unsigned long sectors[NR_STAT_GROUPS];
unsigned long ios[NR_STAT_GROUPS];
unsigned long merges[NR_STAT_GROUPS];
unsigned long io_ticks;
local_t in_flight[2];
};
/*
* Macros to operate on percpu disk statistics:
*
* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters and should
* be called between disk_stat_lock() and disk_stat_unlock().
*
* part_stat_read() can be called at any time.
*/
#define part_stat_lock() preempt_disable()
#define part_stat_unlock() preempt_enable()
#define part_stat_get_cpu(part, field, cpu) \
(per_cpu_ptr((part)->dkstats, (cpu))->field)
#define part_stat_get(part, field) \
part_stat_get_cpu(part, field, smp_processor_id())
#define part_stat_read(part, field) \
({ \
typeof((part)->dkstats->field) res = 0; \
unsigned int _cpu; \
for_each_possible_cpu(_cpu) \
res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
res; \
})
static inline void part_stat_set_all(struct hd_struct *part, int value)
{
int i;
for_each_possible_cpu(i)
memset(per_cpu_ptr(part->dkstats, i), value,
sizeof(struct disk_stats));
}
#define part_stat_read_accum(part, field) \
(part_stat_read(part, field[STAT_READ]) + \
part_stat_read(part, field[STAT_WRITE]) + \
part_stat_read(part, field[STAT_DISCARD]))
#define __part_stat_add(part, field, addnd) \
__this_cpu_add((part)->dkstats->field, addnd)
#define part_stat_add(part, field, addnd) do { \
__part_stat_add((part), field, addnd); \
if ((part)->partno) \
__part_stat_add(&part_to_disk((part))->part0, \
field, addnd); \
} while (0)
#define part_stat_dec(gendiskp, field) \
part_stat_add(gendiskp, field, -1)
#define part_stat_inc(gendiskp, field) \
part_stat_add(gendiskp, field, 1)
#define part_stat_sub(gendiskp, field, subnd) \
part_stat_add(gendiskp, field, -subnd)
#define part_stat_local_dec(gendiskp, field) \
local_dec(&(part_stat_get(gendiskp, field)))
#define part_stat_local_inc(gendiskp, field) \
local_inc(&(part_stat_get(gendiskp, field)))
#define part_stat_local_read(gendiskp, field) \
local_read(&(part_stat_get(gendiskp, field)))
#define part_stat_local_read_cpu(gendiskp, field, cpu) \
local_read(&(part_stat_get_cpu(gendiskp, field, cpu)))
#endif /* _LINUX_PART_STAT_H */
|
