v4.19.13 snapshot.
diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c
new file mode 100644
index 0000000..17c46f3
--- /dev/null
+++ b/tools/perf/tests/keep-tracking.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/types.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include "parse-events.h"
+#include "evlist.h"
+#include "evsel.h"
+#include "thread_map.h"
+#include "cpumap.h"
+#include "tests.h"
+
+#define CHECK__(x) { \
+ while ((x) < 0) { \
+ pr_debug(#x " failed!\n"); \
+ goto out_err; \
+ } \
+}
+
+#define CHECK_NOT_NULL__(x) { \
+ while ((x) == NULL) { \
+ pr_debug(#x " failed!\n"); \
+ goto out_err; \
+ } \
+}
+
+static int find_comm(struct perf_evlist *evlist, const char *comm)
+{
+ union perf_event *event;
+ struct perf_mmap *md;
+ int i, found;
+
+ found = 0;
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ md = &evlist->mmap[i];
+ if (perf_mmap__read_init(md) < 0)
+ continue;
+ while ((event = perf_mmap__read_event(md)) != NULL) {
+ if (event->header.type == PERF_RECORD_COMM &&
+ (pid_t)event->comm.pid == getpid() &&
+ (pid_t)event->comm.tid == getpid() &&
+ strcmp(event->comm.comm, comm) == 0)
+ found += 1;
+ perf_mmap__consume(md);
+ }
+ perf_mmap__read_done(md);
+ }
+ return found;
+}
+
+/**
+ * test__keep_tracking - test using a dummy software event to keep tracking.
+ *
+ * This function implements a test that checks that tracking events continue
+ * when an event is disabled but a dummy software event is not disabled. If the
+ * test passes %0 is returned, otherwise %-1 is returned.
+ */
+int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_unused)
+{
+ struct record_opts opts = {
+ .mmap_pages = UINT_MAX,
+ .user_freq = UINT_MAX,
+ .user_interval = ULLONG_MAX,
+ .target = {
+ .uses_mmap = true,
+ },
+ };
+ struct thread_map *threads = NULL;
+ struct cpu_map *cpus = NULL;
+ struct perf_evlist *evlist = NULL;
+ struct perf_evsel *evsel = NULL;
+ int found, err = -1;
+ const char *comm;
+
+ threads = thread_map__new(-1, getpid(), UINT_MAX);
+ CHECK_NOT_NULL__(threads);
+
+ cpus = cpu_map__new(NULL);
+ CHECK_NOT_NULL__(cpus);
+
+ evlist = perf_evlist__new();
+ CHECK_NOT_NULL__(evlist);
+
+ perf_evlist__set_maps(evlist, cpus, threads);
+
+ CHECK__(parse_events(evlist, "dummy:u", NULL));
+ CHECK__(parse_events(evlist, "cycles:u", NULL));
+
+ perf_evlist__config(evlist, &opts, NULL);
+
+ evsel = perf_evlist__first(evlist);
+
+ evsel->attr.comm = 1;
+ evsel->attr.disabled = 1;
+ evsel->attr.enable_on_exec = 0;
+
+ if (perf_evlist__open(evlist) < 0) {
+ pr_debug("Unable to open dummy and cycles event\n");
+ err = TEST_SKIP;
+ goto out_err;
+ }
+
+ CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
+
+ /*
+ * First, test that a 'comm' event can be found when the event is
+ * enabled.
+ */
+
+ perf_evlist__enable(evlist);
+
+ comm = "Test COMM 1";
+ CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
+
+ perf_evlist__disable(evlist);
+
+ found = find_comm(evlist, comm);
+ if (found != 1) {
+ pr_debug("First time, failed to find tracking event.\n");
+ goto out_err;
+ }
+
+ /*
+ * Secondly, test that a 'comm' event can be found when the event is
+ * disabled with the dummy event still enabled.
+ */
+
+ perf_evlist__enable(evlist);
+
+ evsel = perf_evlist__last(evlist);
+
+ CHECK__(perf_evsel__disable(evsel));
+
+ comm = "Test COMM 2";
+ CHECK__(prctl(PR_SET_NAME, (unsigned long)comm, 0, 0, 0));
+
+ perf_evlist__disable(evlist);
+
+ found = find_comm(evlist, comm);
+ if (found != 1) {
+ pr_debug("Seconf time, failed to find tracking event.\n");
+ goto out_err;
+ }
+
+ err = 0;
+
+out_err:
+ if (evlist) {
+ perf_evlist__disable(evlist);
+ perf_evlist__delete(evlist);
+ } else {
+ cpu_map__put(cpus);
+ thread_map__put(threads);
+ }
+
+ return err;
+}