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Date: Fri, 25 Feb 2022 19:31:14 +0900
From: Shunsuke <nakamura.shun@...itsu.com>
To: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
mark.rutland@....com, alexander.shishkin@...ux.intel.com,
jolsa@...hat.com, namhyung@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
Shunsuke Nakamura <nakamura.shun@...itsu.com>
Subject: [RFC PATCH 7/7] libperf test: Add test_detect_overflow_event()
From: Shunsuke Nakamura <nakamura.shun@...itsu.com>
Add a test to detect overflowed events.
Committer testing:
$ sudo make tests -C tools/lib/perf/ V=1
make: Entering directory '/home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/lib/perf'
make -f /home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/build/Makefile.build dir=. obj=libperf
make -C /home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/lib/api/ O= libapi.a
make -f /home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/build/Makefile.build dir=./fd obj=libapi
make -f /home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/build/Makefile.build dir=./fs obj=libapi
make -f /home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/build/Makefile.build dir=. obj=tests
make -f /home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/build/Makefile.build dir=./tests obj=tests
running static:
- running tests/test-cpumap.c...OK
- running tests/test-threadmap.c...OK
- running tests/test-evlist.c...
<SNIP>
Event 0 -- overflow flag = 0x1, POLL_UP = 1, other signal event = 0
Event 1 -- overflow flag = 0x2, POLL_UP = 1, other signal event = 0
Event 2 -- overflow flag = 0x4, POLL_UP = 1, other signal event = 0
Event 3 -- overflow flag = 0x8, POLL_UP = 1, other signal event = 0
OK
- running tests/test-evsel.c...
<SNIP>
OK
running dynamic:
- running tests/test-cpumap.c...OK
- running tests/test-threadmap.c...OK
- running tests/test-evlist.c...
<SNIP>
Event 0 -- overflow flag = 0x1, POLL_UP = 1, other signal event = 0
Event 1 -- overflow flag = 0x2, POLL_UP = 1, other signal event = 0
Event 2 -- overflow flag = 0x4, POLL_UP = 1, other signal event = 0
Event 3 -- overflow flag = 0x8, POLL_UP = 1, other signal event = 0
OK
- running tests/test-evsel.c...
<SNIP>
OK
make: Leaving directory '/home/nakamura/build_work/build_kernel/linux-kernel/linux/tools/lib/perf'
Signed-off-by: Shunsuke Nakamura <nakamura.shun@...itsu.com>
---
tools/lib/perf/tests/test-evlist.c | 119 +++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c
index fafc6b0f8687..c0f0109c8b51 100644
--- a/tools/lib/perf/tests/test-evlist.c
+++ b/tools/lib/perf/tests/test-evlist.c
@@ -5,6 +5,8 @@
#include <stdarg.h>
#include <unistd.h>
#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
#include <linux/perf_event.h>
#include <linux/limits.h>
#include <sys/types.h>
@@ -24,6 +26,13 @@
#define EVENT_NUM 15
#define WAIT_COUNT 100000000UL
+static unsigned int overflow_flag;
+static struct signal_counts {
+ int hup;
+ int others;
+} sig_count = { 0, 0 };
+static struct perf_evlist *s_evlist;
+
static int libperf_print(enum libperf_print_level level,
const char *fmt, va_list ap)
{
@@ -570,6 +579,115 @@ static int test_stat_multiplexing(void)
return 0;
}
+static void sig_handler(int signo, siginfo_t *info, void *uc)
+{
+ int err;
+ int idx = 0;
+ struct perf_evsel *evsel;
+
+ switch (info->si_code) {
+ case POLL_HUP:
+ perf_evlist__for_each_evsel(s_evlist, evsel) {
+ err = perf_evsel__check_fd(evsel, info->si_fd);
+ if (!err) {
+ overflow_flag = (1U << idx);
+ sig_count.hup++;
+ break;
+ }
+ idx++;
+ }
+ break;
+ default:
+ perf_evlist__for_each_evsel(s_evlist, evsel) {
+ err = perf_evsel__check_fd(evsel, info->si_fd);
+ if (!err) {
+ overflow_flag = (1U << idx);
+ sig_count.others++;
+ break;
+ }
+ idx++;
+ }
+ }
+}
+
+static int test_stat_overflow_event(void)
+{
+ static struct sigaction sig;
+
+ struct perf_thread_map *threads;
+ struct perf_evsel *evsel;
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_CPU_CLOCK,
+ .sample_type = PERF_SAMPLE_PERIOD,
+ .sample_period = 100000,
+ .disabled = 1,
+ };
+ int err, i, event_num = 4;
+ unsigned int wait_count;
+
+ /* setup signal handler */
+ memset(&sig, 0, sizeof(struct sigaction));
+ sig.sa_sigaction = (void *)sig_handler;
+ sig.sa_flags = SA_SIGINFO;
+
+ threads = perf_thread_map__new_dummy();
+ __T("failed to create threads", threads);
+
+ perf_thread_map__set_pid(threads, 0, 0);
+
+ s_evlist = perf_evlist__new();
+ __T("failed to create evlist", s_evlist);
+
+ for (i = 0; i < event_num; i++) {
+ evsel = perf_evsel__new(&attr);
+ __T("failed to create evsel", evsel);
+
+ err = perf_evsel__set_close_on_exec(evsel);
+ __T("failed to set PERF_FLAG_FD_CLOEXEC flag to evsel", err == 0);
+
+ perf_evlist__add(s_evlist, evsel);
+ }
+
+ perf_evlist__set_maps(s_evlist, NULL, threads);
+
+ err = perf_evlist__open(s_evlist);
+ __T("failed to open evlist", err == 0);
+
+ i = 0;
+ perf_evlist__for_each_evsel(s_evlist, evsel) {
+ err = perf_evsel__set_signal(evsel, F_OWNER_PID, SIGIO, &sig);
+ __T("failed to set signal", err == 0);
+
+ err = perf_evsel__refresh(evsel, 1);
+ __T("failed to refresh evsel", err == 0);
+
+ wait_count = WAIT_COUNT;
+ while (wait_count--)
+ ;
+
+ __T_VERBOSE("Event %2d -- overflow flag = %#x, ",
+ i, overflow_flag);
+ __T_VERBOSE("POLL_UP = %d, other signal event = %d\n",
+ sig_count.hup, sig_count.others);
+
+ __T("unexpected event overflow detected", overflow_flag && (1U << i));
+ __T("unexpected signal event detected",
+ sig_count.hup == 1 && sig_count.others == 0);
+
+ overflow_flag = 0;
+ sig_count.hup = 0;
+ sig_count.others = 0;
+ i++;
+ }
+
+ perf_evlist__close(s_evlist);
+ perf_evlist__delete(s_evlist);
+ perf_thread_map__put(threads);
+
+ return 0;
+}
+
int test_evlist(int argc, char **argv)
{
__T_START;
@@ -582,6 +700,7 @@ int test_evlist(int argc, char **argv)
test_mmap_thread();
test_mmap_cpus();
test_stat_multiplexing();
+ test_stat_overflow_event();
__T_END;
return tests_failed == 0 ? 0 : -1;
--
2.31.1
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