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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Memory Bandwidth Monitoring (MBM) test
*
* Copyright (C) 2018 Intel Corporation
*
* Authors:
* Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
* Fenghua Yu <fenghua.yu@intel.com>
*/
#include "resctrl.h"
#define RESULT_FILE_NAME "result_mbm"
#define MAX_DIFF_PERCENT 8
#define NUM_OF_RUNS 5
static int
show_bw_info(unsigned long *bw_imc, unsigned long *bw_resc, int span)
{
unsigned long avg_bw_imc = 0, avg_bw_resc = 0;
unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
int runs, ret, avg_diff_per;
float avg_diff = 0;
/*
* Discard the first value which is inaccurate due to monitoring setup
* transition phase.
*/
for (runs = 1; runs < NUM_OF_RUNS ; runs++) {
sum_bw_imc += bw_imc[runs];
sum_bw_resc += bw_resc[runs];
}
avg_bw_imc = sum_bw_imc / 4;
avg_bw_resc = sum_bw_resc / 4;
avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
avg_diff_per = (int)(avg_diff * 100);
ret = avg_diff_per > MAX_DIFF_PERCENT;
ksft_print_msg("%s Check MBM diff within %d%%\n",
ret ? "Fail:" : "Pass:", MAX_DIFF_PERCENT);
ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
ksft_print_msg("Span (MB): %d\n", span);
ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
return ret;
}
static int check_results(int span)
{
unsigned long bw_imc[NUM_OF_RUNS], bw_resc[NUM_OF_RUNS];
char temp[1024], *token_array[8];
char output[] = RESULT_FILE_NAME;
int runs, ret;
FILE *fp;
ksft_print_msg("Checking for pass/fail\n");
fp = fopen(output, "r");
if (!fp) {
perror(output);
return errno;
}
runs = 0;
while (fgets(temp, sizeof(temp), fp)) {
char *token = strtok(temp, ":\t");
int i = 0;
while (token) {
token_array[i++] = token;
token = strtok(NULL, ":\t");
}
bw_resc[runs] = strtoul(token_array[5], NULL, 0);
bw_imc[runs] = strtoul(token_array[3], NULL, 0);
runs++;
}
ret = show_bw_info(bw_imc, bw_resc, span);
fclose(fp);
return ret;
}
static int mbm_setup(int num, ...)
{
struct resctrl_val_param *p;
static int num_of_runs;
va_list param;
int ret = 0;
/* Run NUM_OF_RUNS times */
if (num_of_runs++ >= NUM_OF_RUNS)
return END_OF_TESTS;
va_start(param, num);
p = va_arg(param, struct resctrl_val_param *);
va_end(param);
/* Set up shemata with 100% allocation on the first run. */
if (num_of_runs == 0)
ret = write_schemata(p->ctrlgrp, "100", p->cpu_no,
p->resctrl_val);
return ret;
}
void mbm_test_cleanup(void)
{
remove(RESULT_FILE_NAME);
}
int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd)
{
struct resctrl_val_param param = {
.resctrl_val = MBM_STR,
.ctrlgrp = "c1",
.mongrp = "m1",
.span = span,
.cpu_no = cpu_no,
.mum_resctrlfs = 1,
.filename = RESULT_FILE_NAME,
.bw_report = bw_report,
.setup = mbm_setup
};
int ret;
remove(RESULT_FILE_NAME);
ret = resctrl_val(benchmark_cmd, ¶m);
if (ret)
return ret;
ret = check_results(span);
if (ret)
return ret;
mbm_test_cleanup();
return 0;
}
|
