linux-kernel - [PATCH 3/9] perf tests: Add precise event automated test

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Date:	Thu,  9 May 2013 15:32:18 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 3/9] perf tests: Add precise event automated test

The test detects the precise attribute availability and try
to open perf event with each allowed precise attribute value.

Signed-off-by: Jiri Olsa <jolsa@...hat.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Stephane Eranian <eranian@...gle.com>
---
 tools/perf/Makefile             |  1 +
 tools/perf/tests/builtin-test.c |  4 ++++
 tools/perf/tests/precise.c      | 49 +++++++++++++++++++++++++++++++++++++++++
 tools/perf/tests/tests.h        |  1 +
 4 files changed, 55 insertions(+)
 create mode 100644 tools/perf/tests/precise.c

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 477e7bf..f96de83 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -391,6 +391,7 @@ LIB_OBJS += $(OUTPUT)tests/bp_signal.o
 LIB_OBJS += $(OUTPUT)tests/bp_signal_overflow.o
 LIB_OBJS += $(OUTPUT)tests/task-exit.o
 LIB_OBJS += $(OUTPUT)tests/sw-clock.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 0918ada..eda716b 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -94,6 +94,10 @@ static struct test {
 		.func = test__sw_clock_freq,
 	},
 	{
+		.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..c548520
--- /dev/null
+++ b/tools/perf/tests/precise.c
@@ -0,0 +1,49 @@
+#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 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 = perf_precise__get();
+	int i;
+
+	if (precise <= 0) {
+		pr_debug("no precise info or support\n");
+		return TEST_SKIP;
+	}
+
+	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 dd7feae..ff37f54 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -27,5 +27,6 @@ int test__bp_signal(void);
 int test__bp_signal_overflow(void);
 int test__task_exit(void);
 int test__sw_clock_freq(void);
+int test__precise(void);
 
 #endif /* TESTS_H */
-- 
1.7.11.7

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