From: "jo...@redhat.com" <jo...@redhat.com>
The test detects the precise attribute availability and try
to open perf event with each allowed precise attribute value.
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
---
tools/perf/Makefile | 1 +
tools/perf/tests/builtin-test.c | 4 +++
tools/perf/tests/precise.c | 79 +++++++++++++++++++++++++++++++++++++++++
tools/perf/tests/tests.h | 1 +
4 files changed, 85 insertions(+)
create mode 100644 tools/perf/tests/precise.c
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index dbf1c35..03aae70 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -489,6 +489,7 @@ LIB_OBJS += $(OUTPUT)tests/evsel-tp-sched.o
LIB_OBJS += $(OUTPUT)tests/pmu.o
LIB_OBJS += $(OUTPUT)tests/hists_link.o
LIB_OBJS += $(OUTPUT)tests/python-use.o
+LIB_OBJS += $(OUTPUT)tests/precise.o
BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o
BUILTIN_OBJS += $(OUTPUT)builtin-bench.o
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 6a5dee2..9903af2 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -77,6 +77,10 @@ static struct test {
.func = test__python_use,
},
{
+ .desc = "Test precise event attribute",
+ .func = test__precise,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/precise.c b/tools/perf/tests/precise.c
new file mode 100644
index 0000000..e3eedab
--- /dev/null
+++ b/tools/perf/tests/precise.c
@@ -0,0 +1,79 @@
+#include <linux/kernel.h>
+#include <linux/perf_event.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "perf.h"
+#include "tests.h"
+#include "util.h"
+#include "sysfs.h"
+
+static int get_precise(void)
+{
+ struct stat st;
+ char path[PATH_MAX];
+ int precise = 0;
+
+ scnprintf(path, PATH_MAX, "%s/devices/cpu/precise",
+ sysfs_find_mountpoint());
+
+ if (!lstat(path, &st)) {
+ FILE *file;
+
+ file = fopen(path, "r");
+ if (!file)
+ return -1;
+
+ if (1 != fscanf(file, "%d", &precise)) {
+ pr_debug("failed to read precise info\n");
+ precise = -1;
+ }
+
+ fclose(file);
+ }
+
+ return precise;
+}
+
+static int event_open_precise(int precise)
+{
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_CPU_CYCLES,
+ .precise_ip = precise,
+ };
+ int fd;
+
+ pr_debug("open cycles event with precise %d\n", precise);
+
+ fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
+ if (fd < 0) {
+ pr_debug("failed to open event, syscall returned "
+ "with %d (%s)\n", fd, strerror(errno));
+ return -1;
+ }
+
+ close(fd);
+ return 0;
+
+}
+
+int test__precise(void)
+{
+ int precise = get_precise();
+ int i;
+
+ if (!precise) {
+ pr_debug("no precise info or support\n");
+ return TEST_SKIP;
+ }
+
+ if (precise < 0)
+ return TEST_FAIL;
+
+ for (i = 1; i <= precise; i++)
+ if (event_open_precise(i))
+ return TEST_FAIL;
+
+ return TEST_OK;
+}
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 5de0be1..ff6db12 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -23,5 +23,6 @@ int test__dso_data(void);
int test__parse_events(void);
int test__hists_link(void);
int test__python_use(void);
+int test__precise(void);
#endif /* TESTS_H */
--
1.7.11.7
--
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