perf tests: Test breakpoint overflow signal handler counts

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: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1362940871-24486-7-git-send-email-jolsa@redhat.com
[ committer note: s/pr_err/pr_debug/g i.e. print just OK or FAILED in non verbose mode ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

4 files changed, 132 insertions, 0 deletions

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 21e0b4b04465..990e9a113190 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -512,6 +512,7 @@ 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 000000000000..fe7ed28815f8
--- /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_debug("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_debug("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_debug("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_debug("\tWrong number of executions %lld != %d\n",
+                count, EXECUTIONS);
+                fails++;
+        }
+
+        if (overflows != EXECUTIONS / THRESHOLD) {
+                pr_debug("\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 37b108bf973c..45d9ad442d56 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 05d0e58064a3..6cf1ec4866d3 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 */