Adding mmaping tests that generates prctl call on every cpu validates it gets all the related events in ring buffer.
Link: http://lkml.kernel.org/n/tip-9qdckblmgjm42ofd7hafl...@git.kernel.org Signed-off-by: Jiri Olsa <jo...@kernel.org> --- tools/perf/lib/tests/test-evlist.c | 97 ++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) diff --git a/tools/perf/lib/tests/test-evlist.c b/tools/perf/lib/tests/test-evlist.c index 90a1869ba4b1..d8c52ebfa53a 100644 --- a/tools/perf/lib/tests/test-evlist.c +++ b/tools/perf/lib/tests/test-evlist.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include <stdio.h> +#include <sched.h> #include <stdarg.h> #include <unistd.h> #include <stdlib.h> @@ -299,6 +300,101 @@ static int test_mmap_thread(void) return 0; } +static int test_mmap_cpus(void) +{ + struct perf_evlist *evlist; + struct perf_evsel *evsel; + struct perf_mmap *map; + struct perf_cpu_map *cpus; + struct perf_event_attr attr = { + .type = PERF_TYPE_TRACEPOINT, + .sample_period = 1, + .wakeup_watermark = 1, + .disabled = 1, + }; + cpu_set_t saved_mask; + char path[PATH_MAX]; + int id, err, cpu, tmp; + union perf_event *event; + int count = 0; + + snprintf(path, PATH_MAX, "%s/kernel/debug/tracing/events/syscalls/sys_enter_prctl/id", + sysfs__mountpoint()); + + if (filename__read_int(path, &id)) { + fprintf(stderr, "error: failed to get tracepoint id: %s\n", path); + return -1; + } + + attr.config = id; + + cpus = perf_cpu_map__new(NULL); + __T("failed to create cpus", cpus); + + evlist = perf_evlist__new(); + __T("failed to create evlist", evlist); + + evsel = perf_evsel__new(&attr); + __T("failed to create evsel1", evsel); + + perf_evlist__add(evlist, evsel); + + perf_evlist__set_maps(evlist, cpus, NULL); + + err = perf_evlist__open(evlist); + __T("failed to open evlist", err == 0); + + err = perf_evlist__mmap(evlist, 4); + __T("failed to mmap evlist", err == 0); + + perf_evlist__enable(evlist); + + err = sched_getaffinity(0, sizeof(saved_mask), &saved_mask); + __T("sched_getaffinity failed", err == 0); + + perf_cpu_map__for_each_cpu(cpu, tmp, cpus) { + cpu_set_t mask; + + CPU_ZERO(&mask); + CPU_SET(cpu, &mask); + + err = sched_setaffinity(0, sizeof(mask), &mask); + __T("sched_setaffinity failed", err == 0); + + prctl(0, 0, 0, 0, 0); + } + + err = sched_setaffinity(0, sizeof(saved_mask), &saved_mask); + __T("sched_setaffinity failed", err == 0); + + perf_evlist__disable(evlist); + + perf_evlist__for_each_mmap(evlist, map, false) { + if (perf_mmap__read_init(map) < 0) + continue; + + while ((event = perf_mmap__read_event(map)) != NULL) { + count++; + perf_mmap__consume(map); + } + + perf_mmap__read_done(map); + } + + /* calls perf_evlist__munmap/perf_evlist__close */ + perf_evlist__delete(evlist); + + /* + * The generated prctl events should match the + * number of cpus or be bigger (we are system-wide). + */ + __T("failed count", count >= perf_cpu_map__nr(cpus)); + + perf_cpu_map__put(cpus); + + return 0; +} + int main(int argc, char **argv) { __T_START; @@ -309,6 +405,7 @@ int main(int argc, char **argv) test_stat_thread(); test_stat_thread_enable(); test_mmap_thread(); + test_mmap_cpus(); __T_OK; return 0; -- 2.21.0
