Messages in this thread Patch in this message | | | From | Shunsuke Nakamura <> | Subject | [RFC PATCH v2 7/7] libperf test: Add test_stat_overflow_event() | Date | Fri, 25 Mar 2022 13:38:29 +0900 |
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Add a test to check 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@fujitsu.com> --- tools/lib/perf/tests/test-evlist.c | 127 +++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+)
diff --git a/tools/lib/perf/tests/test-evlist.c b/tools/lib/perf/tests/test-evlist.c index ed616fc19b4f..ecfe35c64c40 100644 --- a/tools/lib/perf/tests/test-evlist.c +++ b/tools/lib/perf/tests/test-evlist.c @@ -6,6 +6,8 @@ #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> @@ -25,6 +27,13 @@ #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) { @@ -571,6 +580,123 @@ static int test_stat_multiplexing(void) return 0; } +static void sig_handler(int signo, siginfo_t *info, void *uc) +{ + struct perf_evsel *evsel; + int idx = 0; + bool overflow; + int err; + + switch (info->si_code) { + case POLL_HUP: + perf_evlist__for_each_evsel(s_evlist, evsel) { + err = perf_evsel__check_overflow(evsel, info->si_fd, &overflow); + if (err) + fprintf(stderr, "failed to check evsel overflow %d\n", err); + + if (overflow) { + overflow_flag = (1U << idx); + sig_count.hup++; + break; + } + idx++; + } + break; + default: + perf_evlist__for_each_evsel(s_evlist, evsel) { + err = perf_evsel__check_overflow(evsel, info->si_fd, &overflow); + if (err) + fprintf(stderr, "failed to check evsel overflow %d\n", err); + + if (overflow) { + 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; + + LIBPERF_OPTS(perf_evsel_open_opts, opts, + .open_flags = PERF_FLAG_FD_CLOEXEC, + .flags = (O_RDWR | O_NONBLOCK | O_ASYNC), + .signal = SIGIO, + .owner_type = F_OWNER_PID, + .sig = &sig); + + /* 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); + + perf_evlist__add(s_evlist, evsel); + } + + perf_evlist__set_maps(s_evlist, NULL, threads); + + err = perf_evlist__open_opts(s_evlist, &opts); + __T("failed to open evlist", err == 0); + + i = 0; + perf_evlist__for_each_evsel(s_evlist, evsel) { + volatile unsigned int wait_count = WAIT_COUNT; + + err = perf_evsel__refresh(evsel, 1); + __T("failed to refresh evsel", err == 0); + + 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; @@ -583,6 +709,7 @@ 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; -- 2.25.1
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