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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/prctl.h>
#include "parse-events.h"
#include "evlist.h"
#include "evsel.h"
#include "thread_map.h"
#include "cpumap.h"
#include "tests.h"
#include "../arch/x86/util/tsc.h"
#define CHECK__(x) { \
while ((x) < 0) { \
pr_debug(#x " failed!\n"); \
goto out_err; \
} \
}
#define CHECK_NOT_NULL__(x) { \
while ((x) == NULL) { \
pr_debug(#x " failed!\n"); \
goto out_err; \
} \
}
static u64 rdtsc(void)
{
unsigned int low, high;
asm volatile("rdtsc" : "=a" (low), "=d" (high));
return low | ((u64)high) << 32;
}
/**
* test__perf_time_to_tsc - test converting perf time to TSC.
*
* This function implements a test that checks that the conversion of perf time
* to and from TSC is consistent with the order of events. If the test passes
* %0 is returned, otherwise %-1 is returned. If TSC conversion is not
* supported then then the test passes but " (not supported)" is printed.
*/
int test__perf_time_to_tsc(void)
{
struct record_opts opts = {
.mmap_pages = UINT_MAX,
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
.freq = 4000,
.target = {
.uses_mmap = true,
},
.sample_time = true,
};
struct thread_map *threads = NULL;
struct cpu_map *cpus = NULL;
struct perf_evlist *evlist = NULL;
struct perf_evsel *evsel = NULL;
int err = -1, ret, i;
const char *comm1, *comm2;
struct perf_tsc_conversion tc;
struct perf_event_mmap_page *pc;
union perf_event *event;
u64 test_tsc, comm1_tsc, comm2_tsc;
u64 test_time, comm1_time = 0, comm2_time = 0;
threads = thread_map__new(-1, getpid(), UINT_MAX);
CHECK_NOT_NULL__(threads);
cpus = cpu_map__new(NULL);
CHECK_NOT_NULL__(cpus);
evlist = perf_evlist__new();
CHECK_NOT_NULL__(evlist);
perf_evlist__set_maps(evlist, cpus, threads);
CHECK__(parse_events(evlist, "cycles:u"));
perf_evlist__config(evlist, &opts);
evsel = perf_evlist__first(evlist);
evsel->attr.comm = 1;
evsel->attr.disabled = 1;
evsel->attr.enable_on_exec = 0;
CHECK__(perf_evlist__open(evlist));
CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
pc = evlist->mmap[0].base;
ret = perf_read_tsc_conversion(pc, &tc);
if (ret) {
if (ret == -EOPNOTSUPP) {
fprintf(stderr, " (not supported)");
return 0;
}
goto out_err;
}
perf_evlist__enable(evlist);
comm1 = "Test COMM 1";
CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
test_tsc = rdtsc();
comm2 = "Test COMM 2";
CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
perf_evlist__disable(evlist);
for (i = 0; i < evlist->nr_mmaps; i++) {
while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
struct perf_sample sample;
if (event->header.type != PERF_RECORD_COMM ||
(pid_t)event->comm.pid != getpid() ||
(pid_t)event->comm.tid != getpid())
goto next_event;
if (strcmp(event->comm.comm, comm1) == 0) {
CHECK__(perf_evsel__parse_sample(evsel, event,
&sample));
comm1_time = sample.time;
}
if (strcmp(event->comm.comm, comm2) == 0) {
CHECK__(perf_evsel__parse_sample(evsel, event,
&sample));
comm2_time = sample.time;
}
next_event:
perf_evlist__mmap_consume(evlist, i);
}
}
if (!comm1_time || !comm2_time)
goto out_err;
test_time = tsc_to_perf_time(test_tsc, &tc);
comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
comm1_time, comm1_tsc);
pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
test_time, test_tsc);
pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
comm2_time, comm2_tsc);
if (test_time <= comm1_time ||
test_time >= comm2_time)
goto out_err;
if (test_tsc <= comm1_tsc ||
test_tsc >= comm2_tsc)
goto out_err;
err = 0;
out_err:
if (evlist) {
perf_evlist__disable(evlist);
perf_evlist__delete(evlist);
}
return err;
}
|
