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
|
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <stdio.h>
#include <sys/epoll.h>
#include <util/evlist.h>
#include <linux/filter.h>
#include "tests.h"
#include "debug.h"
#include "probe-file.h"
#include "build-id.h"
/* To test SDT event, we need libelf support to scan elf binary */
#if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT)
#include <sys/sdt.h>
static int target_function(void)
{
DTRACE_PROBE(perf, test_target);
return TEST_OK;
}
/* Copied from builtin-buildid-cache.c */
static int build_id_cache__add_file(const char *filename)
{
char sbuild_id[SBUILD_ID_SIZE];
u8 build_id[BUILD_ID_SIZE];
int err;
err = filename__read_build_id(filename, &build_id, sizeof(build_id));
if (err < 0) {
pr_debug("Failed to read build id of %s\n", filename);
return err;
}
build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
err = build_id_cache__add_s(sbuild_id, filename, NULL, false, false);
if (err < 0)
pr_debug("Failed to add build id cache of %s\n", filename);
return err;
}
static char *get_self_path(void)
{
char *buf = calloc(PATH_MAX, sizeof(char));
if (buf && readlink("/proc/self/exe", buf, PATH_MAX - 1) < 0) {
pr_debug("Failed to get correct path of perf\n");
free(buf);
return NULL;
}
return buf;
}
static int search_cached_probe(const char *target,
const char *group, const char *event)
{
struct probe_cache *cache = probe_cache__new(target, NULL);
int ret = 0;
if (!cache) {
pr_debug("Failed to open probe cache of %s\n", target);
return -EINVAL;
}
if (!probe_cache__find_by_name(cache, group, event)) {
pr_debug("Failed to find %s:%s in the cache\n", group, event);
ret = -ENOENT;
}
probe_cache__delete(cache);
return ret;
}
int test__sdt_event(struct test *test __maybe_unused, int subtests __maybe_unused)
{
int ret = TEST_FAIL;
char __tempdir[] = "./test-buildid-XXXXXX";
char *tempdir = NULL, *myself = get_self_path();
if (myself == NULL || mkdtemp(__tempdir) == NULL) {
pr_debug("Failed to make a tempdir for build-id cache\n");
goto error;
}
/* Note that buildid_dir must be an absolute path */
tempdir = realpath(__tempdir, NULL);
if (tempdir == NULL)
goto error_rmdir;
/* At first, scan itself */
set_buildid_dir(tempdir);
if (build_id_cache__add_file(myself) < 0)
goto error_rmdir;
/* Open a cache and make sure the SDT is stored */
if (search_cached_probe(myself, "sdt_perf", "test_target") < 0)
goto error_rmdir;
/* TBD: probing on the SDT event and collect logs */
/* Call the target and get an event */
ret = target_function();
error_rmdir:
/* Cleanup temporary buildid dir */
rm_rf(__tempdir);
error:
free(tempdir);
free(myself);
return ret;
}
#else
int test__sdt_event(struct test *test __maybe_unused, int subtests __maybe_unused)
{
pr_debug("Skip SDT event test because SDT support is not compiled\n");
return TEST_SKIP;
}
#endif
|
