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
|
/*
* Copyright 2014, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#define _GNU_SOURCE
#include <elf.h>
#include <limits.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <sys/prctl.h>
#include "event.h"
#include "lib.h"
#include "utils.h"
/*
* Test that per-event excludes work.
*/
static int per_event_excludes(void)
{
struct event *e, events[4];
char *platform;
int i;
platform = (char *)get_auxv_entry(AT_BASE_PLATFORM);
FAIL_IF(!platform);
SKIP_IF(strcmp(platform, "power8") != 0);
/*
* We need to create the events disabled, otherwise the running/enabled
* counts don't match up.
*/
e = &events[0];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions");
e->attr.disabled = 1;
e = &events[1];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions(k)");
e->attr.disabled = 1;
e->attr.exclude_user = 1;
e->attr.exclude_hv = 1;
e = &events[2];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions(h)");
e->attr.disabled = 1;
e->attr.exclude_user = 1;
e->attr.exclude_kernel = 1;
e = &events[3];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions(u)");
e->attr.disabled = 1;
e->attr.exclude_hv = 1;
e->attr.exclude_kernel = 1;
FAIL_IF(event_open(&events[0]));
/*
* The open here will fail if we don't have per event exclude support,
* because the second event has an incompatible set of exclude settings
* and we're asking for the events to be in a group.
*/
for (i = 1; i < 4; i++)
FAIL_IF(event_open_with_group(&events[i], events[0].fd));
/*
* Even though the above will fail without per-event excludes we keep
* testing in order to be thorough.
*/
prctl(PR_TASK_PERF_EVENTS_ENABLE);
/* Spin for a while */
for (i = 0; i < INT_MAX; i++)
asm volatile("" : : : "memory");
prctl(PR_TASK_PERF_EVENTS_DISABLE);
for (i = 0; i < 4; i++) {
FAIL_IF(event_read(&events[i]));
event_report(&events[i]);
}
/*
* We should see that all events have enabled == running. That
* shows that they were all on the PMU at once.
*/
for (i = 0; i < 4; i++)
FAIL_IF(events[i].result.running != events[i].result.enabled);
/*
* We can also check that the result for instructions is >= all the
* other counts. That's because it is counting all instructions while
* the others are counting a subset.
*/
for (i = 1; i < 4; i++)
FAIL_IF(events[0].result.value < events[i].result.value);
for (i = 0; i < 4; i++)
event_close(&events[i]);
return 0;
}
int main(void)
{
return test_harness(per_event_excludes, "per_event_excludes");
}
|
