forked from Minki/linux
8e5dc84835
Add a basic test case for SDT event support. This test scans an SDT event in perftools and check whether the SDT event is correctly stored into the buildid cache. Here is an example: ---- $ perf test sdt -v 47: Test SDT event probing : --- start --- test child forked, pid 20732 Found 72 SDTs in /home/mhiramat/ksrc/linux/tools/perf/perf Writing cache: %sdt_perf:test_target=test_target Cache committed: 0 symbol:test_target file:(null) line:0 offset:0 return:0 lazy:(null) test child finished with 0 ---- end ---- Test SDT event probing: Ok ---- Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/146831796546.17065.1502584370844087537.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
#include <stdio.h>
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#include <sys/epoll.h>
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#include <util/util.h>
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#include <util/evlist.h>
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#include <linux/filter.h>
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#include "tests.h"
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#include "debug.h"
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#include "probe-file.h"
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#include "build-id.h"
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/* To test SDT event, we need libelf support to scan elf binary */
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#if defined(HAVE_SDT_EVENT) && defined(HAVE_LIBELF_SUPPORT)
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#include <sys/sdt.h>
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static int target_function(void)
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{
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DTRACE_PROBE(perf, test_target);
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return TEST_OK;
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}
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/* Copied from builtin-buildid-cache.c */
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static int build_id_cache__add_file(const char *filename)
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{
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char sbuild_id[SBUILD_ID_SIZE];
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u8 build_id[BUILD_ID_SIZE];
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int err;
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err = filename__read_build_id(filename, &build_id, sizeof(build_id));
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if (err < 0) {
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pr_debug("Failed to read build id of %s\n", filename);
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return err;
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}
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build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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err = build_id_cache__add_s(sbuild_id, filename, false, false);
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if (err < 0)
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pr_debug("Failed to add build id cache of %s\n", filename);
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return err;
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}
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static char *get_self_path(void)
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{
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char *buf = calloc(PATH_MAX, sizeof(char));
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if (buf && readlink("/proc/self/exe", buf, PATH_MAX) < 0) {
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pr_debug("Failed to get correct path of perf\n");
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free(buf);
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return NULL;
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}
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return buf;
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}
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static int search_cached_probe(const char *target,
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const char *group, const char *event)
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{
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struct probe_cache *cache = probe_cache__new(target);
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int ret = 0;
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if (!cache) {
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pr_debug("Failed to open probe cache of %s\n", target);
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return -EINVAL;
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}
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if (!probe_cache__find_by_name(cache, group, event)) {
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pr_debug("Failed to find %s:%s in the cache\n", group, event);
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ret = -ENOENT;
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}
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probe_cache__delete(cache);
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return ret;
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}
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int test__sdt_event(int subtests __maybe_unused)
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{
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int ret = TEST_FAIL;
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char __tempdir[] = "./test-buildid-XXXXXX";
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char *tempdir = NULL, *myself = get_self_path();
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if (myself == NULL || mkdtemp(__tempdir) == NULL) {
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pr_debug("Failed to make a tempdir for build-id cache\n");
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goto error;
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}
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/* Note that buildid_dir must be an absolute path */
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tempdir = realpath(__tempdir, NULL);
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/* At first, scan itself */
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set_buildid_dir(tempdir);
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if (build_id_cache__add_file(myself) < 0)
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goto error_rmdir;
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/* Open a cache and make sure the SDT is stored */
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if (search_cached_probe(myself, "sdt_perf", "test_target") < 0)
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goto error_rmdir;
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/* TBD: probing on the SDT event and collect logs */
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/* Call the target and get an event */
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ret = target_function();
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error_rmdir:
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/* Cleanup temporary buildid dir */
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rm_rf(tempdir);
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error:
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free(tempdir);
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free(myself);
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return ret;
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}
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#else
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int test__sdt_event(int subtests __maybe_unused)
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{
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pr_debug("Skip SDT event test because SDT support is not compiled\n");
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return TEST_SKIP;
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}
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#endif
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