1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Memory Bandwidth Allocation (MBA) test
4 *
5 * Copyright (C) 2018 Intel Corporation
6 *
7 * Authors:
8 * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
9 * Fenghua Yu <fenghua.yu@intel.com>
10 */
11 #include "resctrl.h"
12
13 #define RESULT_FILE_NAME "result_mba"
14 #define NUM_OF_RUNS 5
15 #define MAX_DIFF_PERCENT 8
16 #define ALLOCATION_MAX 100
17 #define ALLOCATION_MIN 10
18 #define ALLOCATION_STEP 10
19
20 /*
21 * Change schemata percentage from 100 to 10%. Write schemata to specified
22 * con_mon grp, mon_grp in resctrl FS.
23 * For each allocation, run 5 times in order to get average values.
24 */
mba_setup(struct resctrl_val_param * p)25 static int mba_setup(struct resctrl_val_param *p)
26 {
27 static int runs_per_allocation, allocation = 100;
28 char allocation_str[64];
29 int ret;
30
31 if (runs_per_allocation >= NUM_OF_RUNS)
32 runs_per_allocation = 0;
33
34 /* Only set up schemata once every NUM_OF_RUNS of allocations */
35 if (runs_per_allocation++ != 0)
36 return 0;
37
38 if (allocation < ALLOCATION_MIN || allocation > ALLOCATION_MAX)
39 return END_OF_TESTS;
40
41 sprintf(allocation_str, "%d", allocation);
42
43 ret = write_schemata(p->ctrlgrp, allocation_str, p->cpu_no,
44 p->resctrl_val);
45 if (ret < 0)
46 return ret;
47
48 allocation -= ALLOCATION_STEP;
49
50 return 0;
51 }
52
show_mba_info(unsigned long * bw_imc,unsigned long * bw_resc)53 static bool show_mba_info(unsigned long *bw_imc, unsigned long *bw_resc)
54 {
55 int allocation, runs;
56 bool ret = false;
57
58 ksft_print_msg("Results are displayed in (MB)\n");
59 /* Memory bandwidth from 100% down to 10% */
60 for (allocation = 0; allocation < ALLOCATION_MAX / ALLOCATION_STEP;
61 allocation++) {
62 unsigned long avg_bw_imc, avg_bw_resc;
63 unsigned long sum_bw_imc = 0, sum_bw_resc = 0;
64 int avg_diff_per;
65 float avg_diff;
66
67 /*
68 * The first run is discarded due to inaccurate value from
69 * phase transition.
70 */
71 for (runs = NUM_OF_RUNS * allocation + 1;
72 runs < NUM_OF_RUNS * allocation + NUM_OF_RUNS ; runs++) {
73 sum_bw_imc += bw_imc[runs];
74 sum_bw_resc += bw_resc[runs];
75 }
76
77 avg_bw_imc = sum_bw_imc / (NUM_OF_RUNS - 1);
78 avg_bw_resc = sum_bw_resc / (NUM_OF_RUNS - 1);
79 avg_diff = (float)labs(avg_bw_resc - avg_bw_imc) / avg_bw_imc;
80 avg_diff_per = (int)(avg_diff * 100);
81
82 ksft_print_msg("%s Check MBA diff within %d%% for schemata %u\n",
83 avg_diff_per > MAX_DIFF_PERCENT ?
84 "Fail:" : "Pass:",
85 MAX_DIFF_PERCENT,
86 ALLOCATION_MAX - ALLOCATION_STEP * allocation);
87
88 ksft_print_msg("avg_diff_per: %d%%\n", avg_diff_per);
89 ksft_print_msg("avg_bw_imc: %lu\n", avg_bw_imc);
90 ksft_print_msg("avg_bw_resc: %lu\n", avg_bw_resc);
91 if (avg_diff_per > MAX_DIFF_PERCENT)
92 ret = true;
93 }
94
95 ksft_print_msg("%s Check schemata change using MBA\n",
96 ret ? "Fail:" : "Pass:");
97 if (ret)
98 ksft_print_msg("At least one test failed\n");
99
100 return ret;
101 }
102
check_results(void)103 static int check_results(void)
104 {
105 char *token_array[8], output[] = RESULT_FILE_NAME, temp[512];
106 unsigned long bw_imc[1024], bw_resc[1024];
107 int runs;
108 FILE *fp;
109
110 fp = fopen(output, "r");
111 if (!fp) {
112 ksft_perror(output);
113
114 return errno;
115 }
116
117 runs = 0;
118 while (fgets(temp, sizeof(temp), fp)) {
119 char *token = strtok(temp, ":\t");
120 int fields = 0;
121
122 while (token) {
123 token_array[fields++] = token;
124 token = strtok(NULL, ":\t");
125 }
126
127 /* Field 3 is perf imc value */
128 bw_imc[runs] = strtoul(token_array[3], NULL, 0);
129 /* Field 5 is resctrl value */
130 bw_resc[runs] = strtoul(token_array[5], NULL, 0);
131 runs++;
132 }
133
134 fclose(fp);
135
136 return show_mba_info(bw_imc, bw_resc);
137 }
138
mba_test_cleanup(void)139 void mba_test_cleanup(void)
140 {
141 remove(RESULT_FILE_NAME);
142 }
143
mba_schemata_change(int cpu_no,const char * const * benchmark_cmd)144 int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd)
145 {
146 struct resctrl_val_param param = {
147 .resctrl_val = MBA_STR,
148 .ctrlgrp = "c1",
149 .mongrp = "m1",
150 .cpu_no = cpu_no,
151 .filename = RESULT_FILE_NAME,
152 .bw_report = "reads",
153 .setup = mba_setup
154 };
155 int ret;
156
157 remove(RESULT_FILE_NAME);
158
159 ret = resctrl_val(benchmark_cmd, ¶m);
160 if (ret)
161 goto out;
162
163 ret = check_results();
164
165 out:
166 mba_test_cleanup();
167
168 return ret;
169 }
170