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
|
// SPDX-License-Identifier: GPL-2.0
#include <stdint.h>
#include "resctrl.h"
struct read_format {
__u64 nr; /* The number of events */
struct {
__u64 value; /* The value of the event */
} values[2];
};
char llc_occup_path[1024];
/*
* Get LLC Occupancy as reported by RESCTRL FS
* For CQM,
* 1. If con_mon grp and mon grp given, then read from mon grp in
* con_mon grp
* 2. If only con_mon grp given, then read from con_mon grp
* 3. If both not given, then read from root con_mon grp
* For CAT,
* 1. If con_mon grp given, then read from it
* 2. If con_mon grp not given, then read from root con_mon grp
*
* Return: =0 on success. <0 on failure.
*/
static int get_llc_occu_resctrl(unsigned long *llc_occupancy)
{
FILE *fp;
fp = fopen(llc_occup_path, "r");
if (!fp) {
perror("Failed to open results file");
return errno;
}
if (fscanf(fp, "%lu", llc_occupancy) <= 0) {
perror("Could not get llc occupancy");
fclose(fp);
return -1;
}
fclose(fp);
return 0;
}
/*
* print_results_cache: the cache results are stored in a file
* @filename: file that stores the results
* @bm_pid: child pid that runs benchmark
* @llc_value: perf miss value /
* llc occupancy value reported by resctrl FS
*
* Return: 0 on success. non-zero on failure.
*/
static int print_results_cache(char *filename, int bm_pid,
unsigned long llc_value)
{
FILE *fp;
if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) {
printf("Pid: %d \t LLC_value: %lu\n", bm_pid,
llc_value);
} else {
fp = fopen(filename, "a");
if (!fp) {
perror("Cannot open results file");
return errno;
}
fprintf(fp, "Pid: %d \t llc_value: %lu\n", bm_pid, llc_value);
fclose(fp);
}
return 0;
}
int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
{
unsigned long llc_occu_resc = 0, llc_value = 0;
int ret;
/*
* Measure llc occupancy from resctrl.
*/
if (!strcmp(param->resctrl_val, "cqm")) {
ret = get_llc_occu_resctrl(&llc_occu_resc);
if (ret < 0)
return ret;
llc_value = llc_occu_resc;
}
ret = print_results_cache(param->filename, bm_pid, llc_value);
if (ret)
return ret;
return 0;
}
|
