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    SubjectRe: [PATCH 07/10] libperf: Add tests_mmap_cpus test
    Em Thu, Oct 17, 2019 at 12:59:15PM +0200, Jiri Olsa escreveu:
    > Adding mmaping tests that generates prctl call on
    > every cpu validates it gets all the related events
    > in ring buffer.

    So _here_ we need _GNU_SOURCE, for this specific test:

    LINK test-evlist-a
    test-evlist.c: In function ‘test_mmap_cpus’:
    test-evlist.c:352:8: warning: implicit declaration of function ‘sched_getaffinity’ [-Wimplicit-function-declaration]
    352 | err = sched_getaffinity(0, sizeof(saved_mask), &saved_mask);
    | ^~~~~~~~~~~~~~~~~
    test-evlist.c:358:3: warning: implicit declaration of function ‘CPU_ZERO’ [-Wimplicit-function-declaration]
    358 | CPU_ZERO(&mask);
    | ^~~~~~~~
    test-evlist.c:359:3: warning: implicit declaration of function ‘CPU_SET’ [-Wimplicit-function-declaration]
    359 | CPU_SET(cpu, &mask);
    | ^~~~~~~
    test-evlist.c:361:9: warning: implicit declaration of function ‘sched_setaffinity’ [-Wimplicit-function-declaration]
    361 | err = sched_setaffinity(0, sizeof(mask), &mask);
    | ^~~~~~~~~~~~~~~~~
    /usr/bin/ld: /tmp/ccOhNrLC.o: in function `test_mmap_cpus':
    /home/acme/git/perf/tools/perf/lib/tests/test-evlist.c:358: undefined reference to `CPU_ZERO'
    /usr/bin/ld: /home/acme/git/perf/tools/perf/lib/tests/test-evlist.c:359: undefined reference to `CPU_SET'
    collect2: error: ld returned 1 exit status
    make[1]: *** [Makefile:22: test-evlist-a] Error 1
    make: *** [Makefile:143: tests] Error 2
    make: Leaving directory '/home/acme/git/perf/tools/perf/lib'
    [root@quaco perf]#

    > Link: http://lkml.kernel.org/n/tip-9qdckblmgjm42ofd7haflso0@git.kernel.org
    > Signed-off-by: Jiri Olsa <jolsa@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

    --

    - Arnaldo

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