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
|
// SPDX-License-Identifier: GPL-2.0
/*
* proactive reclamation: monitor access pattern of a given process, find
* regiosn that seems not accessed, and proactively page out the regions.
*/
#define pr_fmt(fmt) "damon_sample_prcl: " fmt
#include <linux/damon.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
static int target_pid __read_mostly;
module_param(target_pid, int, 0600);
static int damon_sample_prcl_enable_store(
const char *val, const struct kernel_param *kp);
static const struct kernel_param_ops enable_param_ops = {
.set = damon_sample_prcl_enable_store,
.get = param_get_bool,
};
static bool enable __read_mostly;
module_param_cb(enable, &enable_param_ops, &enable, 0600);
MODULE_PARM_DESC(enable, "Enable of disable DAMON_SAMPLE_WSSE");
static struct damon_ctx *ctx;
static struct pid *target_pidp;
static int damon_sample_prcl_after_aggregate(struct damon_ctx *c)
{
struct damon_target *t;
damon_for_each_target(t, c) {
struct damon_region *r;
unsigned long wss = 0;
damon_for_each_region(r, t) {
if (r->nr_accesses > 0)
wss += r->ar.end - r->ar.start;
}
pr_info("wss: %lu\n", wss);
}
return 0;
}
static int damon_sample_prcl_start(void)
{
struct damon_target *target;
struct damos *scheme;
pr_info("start\n");
ctx = damon_new_ctx();
if (!ctx)
return -ENOMEM;
if (damon_select_ops(ctx, DAMON_OPS_VADDR)) {
damon_destroy_ctx(ctx);
return -EINVAL;
}
target = damon_new_target();
if (!target) {
damon_destroy_ctx(ctx);
return -ENOMEM;
}
damon_add_target(ctx, target);
target_pidp = find_get_pid(target_pid);
if (!target_pidp) {
damon_destroy_ctx(ctx);
return -EINVAL;
}
target->pid = target_pidp;
ctx->callback.after_aggregation = damon_sample_prcl_after_aggregate;
scheme = damon_new_scheme(
&(struct damos_access_pattern) {
.min_sz_region = PAGE_SIZE,
.max_sz_region = ULONG_MAX,
.min_nr_accesses = 0,
.max_nr_accesses = 0,
.min_age_region = 50,
.max_age_region = UINT_MAX},
DAMOS_PAGEOUT,
0,
&(struct damos_quota){},
&(struct damos_watermarks){},
NUMA_NO_NODE);
if (!scheme) {
damon_destroy_ctx(ctx);
return -ENOMEM;
}
damon_set_schemes(ctx, &scheme, 1);
return damon_start(&ctx, 1, true);
}
static void damon_sample_prcl_stop(void)
{
pr_info("stop\n");
if (ctx) {
damon_stop(&ctx, 1);
damon_destroy_ctx(ctx);
}
if (target_pidp)
put_pid(target_pidp);
}
static int damon_sample_prcl_enable_store(
const char *val, const struct kernel_param *kp)
{
bool enabled = enable;
int err;
err = kstrtobool(val, &enable);
if (err)
return err;
if (enable == enabled)
return 0;
if (enable)
return damon_sample_prcl_start();
damon_sample_prcl_stop();
return 0;
}
static int __init damon_sample_prcl_init(void)
{
return 0;
}
module_init(damon_sample_prcl_init);
|
