Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753343Ab3CJSmA (ORCPT ); Sun, 10 Mar 2013 14:42:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59610 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752836Ab3CJSl5 (ORCPT ); Sun, 10 Mar 2013 14:41:57 -0400 From: Jiri Olsa To: linux-kernel@vger.kernel.org Cc: Jiri Olsa , Thomas Gleixner , "H. Peter Anvin" , Andi Kleen , Oleg Nesterov , Arnaldo Carvalho de Melo , Peter Zijlstra , Ingo Molnar , Paul Mackerras , Corey Ashford , Frederic Weisbecker , Vince Weaver , Stephane Eranian Subject: [PATCH 6/6] perf tests: Test breakpoint overflow signal handler counts Date: Sun, 10 Mar 2013 19:41:11 +0100 Message-Id: <1362940871-24486-7-git-send-email-jolsa@redhat.com> In-Reply-To: <1362940871-24486-1-git-send-email-jolsa@redhat.com> References: <1362940871-24486-1-git-send-email-jolsa@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5355 Lines: 205 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 Cc: Thomas Gleixner Cc: H. Peter Anvin Cc: Andi Kleen Cc: Oleg Nesterov Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Paul Mackerras Cc: Corey Ashford Cc: Frederic Weisbecker Cc: Vince Weaver Cc: Stephane Eranian --- 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 for + * perf_event_tests (git://github.com/deater/perf_event_tests) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/