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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
// SPDX-License-Identifier: GPL-2.0
/*
* Common Code for DAMON Sysfs Interface
*
* Author: SeongJae Park <sj@kernel.org>
*/
#include <linux/slab.h>
#include "sysfs-common.h"
DEFINE_MUTEX(damon_sysfs_lock);
/*
* unsigned long range directory
*/
struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc(
unsigned long min,
unsigned long max)
{
struct damon_sysfs_ul_range *range = kmalloc_obj(*range);
if (!range)
return NULL;
range->kobj = (struct kobject){};
range->min = min;
range->max = max;
return range;
}
static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct damon_sysfs_ul_range *range = container_of(kobj,
struct damon_sysfs_ul_range, kobj);
return sysfs_emit(buf, "%lu\n", range->min);
}
static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct damon_sysfs_ul_range *range = container_of(kobj,
struct damon_sysfs_ul_range, kobj);
unsigned long min;
int err;
err = kstrtoul(buf, 0, &min);
if (err)
return err;
range->min = min;
return count;
}
static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct damon_sysfs_ul_range *range = container_of(kobj,
struct damon_sysfs_ul_range, kobj);
return sysfs_emit(buf, "%lu\n", range->max);
}
static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct damon_sysfs_ul_range *range = container_of(kobj,
struct damon_sysfs_ul_range, kobj);
unsigned long max;
int err;
err = kstrtoul(buf, 0, &max);
if (err)
return err;
range->max = max;
return count;
}
void damon_sysfs_ul_range_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj));
}
static struct kobj_attribute damon_sysfs_ul_range_min_attr =
__ATTR_RW_MODE(min, 0600);
static struct kobj_attribute damon_sysfs_ul_range_max_attr =
__ATTR_RW_MODE(max, 0600);
static struct attribute *damon_sysfs_ul_range_attrs[] = {
&damon_sysfs_ul_range_min_attr.attr,
&damon_sysfs_ul_range_max_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_ul_range);
const struct kobj_type damon_sysfs_ul_range_ktype = {
.release = damon_sysfs_ul_range_release,
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = damon_sysfs_ul_range_groups,
};
static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg,
char *memcg_path_buf, char *path)
{
#ifdef CONFIG_MEMCG
cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX);
if (sysfs_streq(memcg_path_buf, path))
return true;
#endif /* CONFIG_MEMCG */
return false;
}
int damon_sysfs_memcg_path_to_id(char *memcg_path, u64 *id)
{
struct mem_cgroup *memcg;
char *path;
bool found = false;
if (!memcg_path)
return -EINVAL;
path = kmalloc_array(PATH_MAX, sizeof(*path), GFP_KERNEL);
if (!path)
return -ENOMEM;
for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg;
memcg = mem_cgroup_iter(NULL, memcg, NULL)) {
/* skip offlined memcg */
if (!mem_cgroup_online(memcg))
continue;
if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) {
*id = mem_cgroup_id(memcg);
found = true;
mem_cgroup_iter_break(NULL, memcg);
break;
}
}
kfree(path);
return found ? 0 : -EINVAL;
}
|
