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Subject[PATCH 6/6] perf tests: Test breakpoint overflow signal handler counts
Date
Adding automated test to check the exact number of
breakpoint event overflows and counts.

This test was originally done by Vince Weaver for
perf_event_tests.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Stephane Eranian <eranian@google.com>
---
tools/perf/Makefile | 1 +
tools/perf/tests/bp_signal_overflow.c | 126 ++++++++++++++++++++++++++++++++++
tools/perf/tests/builtin-test.c | 4 ++
tools/perf/tests/tests.h | 1 +
4 files changed, 132 insertions(+)
create mode 100644 tools/perf/tests/bp_signal_overflow.c

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index bea66fe..34a63ce 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -498,6 +498,7 @@ LIB_OBJS += $(OUTPUT)tests/pmu.o
LIB_OBJS += $(OUTPUT)tests/hists_link.o
LIB_OBJS += $(OUTPUT)tests/python-use.o
LIB_OBJS += $(OUTPUT)tests/bp_signal.o
+LIB_OBJS += $(OUTPUT)tests/bp_signal_overflow.o

BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o
BUILTIN_OBJS += $(OUTPUT)builtin-bench.o
diff --git a/tools/perf/tests/bp_signal_overflow.c b/tools/perf/tests/bp_signal_overflow.c
new file mode 100644
index 0000000..556d2ce
--- /dev/null
+++ b/tools/perf/tests/bp_signal_overflow.c
@@ -0,0 +1,126 @@
+/*
+ * Originally done by Vince Weaver <vincent.weaver@maine.edu> for
+ * perf_event_tests (git://github.com/deater/perf_event_tests)
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <linux/compiler.h>
+#include <linux/hw_breakpoint.h>
+
+#include "tests.h"
+#include "debug.h"
+#include "perf.h"
+
+static int overflows;
+
+__attribute__ ((noinline))
+static int test_function(void)
+{
+ return time(NULL);
+}
+
+static void sig_handler(int signum __maybe_unused,
+ siginfo_t *oh __maybe_unused,
+ void *uc __maybe_unused)
+{
+ overflows++;
+}
+
+static long long bp_count(int fd)
+{
+ long long count;
+ int ret;
+
+ ret = read(fd, &count, sizeof(long long));
+ if (ret != sizeof(long long)) {
+ pr_err("failed to read: %d\n", ret);
+ return TEST_FAIL;
+ }
+
+ return count;
+}
+
+#define EXECUTIONS 10000
+#define THRESHOLD 100
+
+int test__bp_signal_overflow(void)
+{
+ struct perf_event_attr pe;
+ struct sigaction sa;
+ long long count;
+ int fd, i, fails = 0;
+
+ /* setup SIGIO signal handler */
+ memset(&sa, 0, sizeof(struct sigaction));
+ sa.sa_sigaction = (void *) sig_handler;
+ sa.sa_flags = SA_SIGINFO;
+
+ if (sigaction(SIGIO, &sa, NULL) < 0) {
+ pr_err("failed setting up signal handler\n");
+ return TEST_FAIL;
+ }
+
+ memset(&pe, 0, sizeof(struct perf_event_attr));
+ pe.type = PERF_TYPE_BREAKPOINT;
+ pe.size = sizeof(struct perf_event_attr);
+
+ pe.config = 0;
+ pe.bp_type = HW_BREAKPOINT_X;
+ pe.bp_addr = (unsigned long) test_function;
+ pe.bp_len = sizeof(long);
+
+ pe.sample_period = THRESHOLD;
+ pe.sample_type = PERF_SAMPLE_IP;
+ pe.wakeup_events = 1;
+
+ pe.disabled = 1;
+ pe.exclude_kernel = 1;
+ pe.exclude_hv = 1;
+
+ fd = sys_perf_event_open(&pe, 0, -1, -1, 0);
+ if (fd < 0) {
+ pr_err("failed opening event %llx\n", pe.config);
+ return TEST_FAIL;
+ }
+
+ fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC);
+ fcntl(fd, F_SETSIG, SIGIO);
+ fcntl(fd, F_SETOWN, getpid());
+
+ ioctl(fd, PERF_EVENT_IOC_RESET, 0);
+ ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
+
+ for (i = 0; i < EXECUTIONS; i++)
+ test_function();
+
+ ioctl(fd, PERF_EVENT_IOC_DISABLE, 0);
+
+ count = bp_count(fd);
+
+ close(fd);
+
+ pr_debug("count %lld, overflow %d\n",
+ count, overflows);
+
+ if (count != EXECUTIONS) {
+ pr_err("\tWrong number of executions %lld != %d\n",
+ count, EXECUTIONS);
+ fails++;
+ }
+
+ if (overflows != EXECUTIONS / THRESHOLD) {
+ pr_err("\tWrong number of overflows %d != %d\n",
+ overflows, EXECUTIONS / THRESHOLD);
+ fails++;
+ }
+
+ return fails ? TEST_FAIL : TEST_OK;
+}
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 37b108b..45d9ad4 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -82,6 +82,10 @@ static struct test {
.func = test__bp_signal,
},
{
+ .desc = "Test breakpoint overflow sampling",
+ .func = test__bp_signal_overflow,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 05d0e58..6cf1ec4 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -24,5 +24,6 @@ int test__parse_events(void);
int test__hists_link(void);
int test__python_use(void);
int test__bp_signal(void);
+int test__bp_signal_overflow(void);

#endif /* TESTS_H */
--
1.7.11.7


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