scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 84 insertions, 0 deletions

diff --git a/tools/perf/tests/openat-syscall.c b/tools/perf/tests/openat-syscall.c
new file mode 100644
index 000000000..b54cbe5f1
--- /dev/null
+++ b/tools/perf/tests/openat-syscall.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <inttypes.h>
+#include <api/fs/tracing_path.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "thread_map.h"
+#include "evsel.h"
+#include "debug.h"
+#include "tests.h"
+#include "util/counts.h"
+
+static int test__openat_syscall_event(struct test_suite *test __maybe_unused,
+				      int subtest __maybe_unused)
+{
+	int err = TEST_FAIL, fd;
+	struct evsel *evsel;
+	unsigned int nr_openat_calls = 111, i;
+	struct perf_thread_map *threads = thread_map__new_by_tid(getpid());
+	char sbuf[STRERR_BUFSIZE];
+	char errbuf[BUFSIZ];
+
+	if (threads == NULL) {
+		pr_debug("thread_map__new\n");
+		return TEST_FAIL;
+	}
+
+	evsel = evsel__newtp("syscalls", "sys_enter_openat");
+	if (IS_ERR(evsel)) {
+		tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "syscalls", "sys_enter_openat");
+		pr_debug("%s\n", errbuf);
+		err = TEST_SKIP;
+		goto out_thread_map_delete;
+	}
+
+	if (evsel__open_per_thread(evsel, threads) < 0) {
+		pr_debug("failed to open counter: %s, "
+			 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
+			 str_error_r(errno, sbuf, sizeof(sbuf)));
+		err = TEST_SKIP;
+		goto out_evsel_delete;
+	}
+
+	for (i = 0; i < nr_openat_calls; ++i) {
+		fd = openat(0, "/etc/passwd", O_RDONLY);
+		close(fd);
+	}
+
+	if (evsel__read_on_cpu(evsel, 0, 0) < 0) {
+		pr_debug("evsel__read_on_cpu\n");
+		goto out_close_fd;
+	}
+
+	if (perf_counts(evsel->counts, 0, 0)->val != nr_openat_calls) {
+		pr_debug("evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
+			 nr_openat_calls, perf_counts(evsel->counts, 0, 0)->val);
+		goto out_close_fd;
+	}
+
+	err = TEST_OK;
+out_close_fd:
+	perf_evsel__close_fd(&evsel->core);
+out_evsel_delete:
+	evsel__delete(evsel);
+out_thread_map_delete:
+	perf_thread_map__put(threads);
+	return err;
+}
+
+static struct test_case tests__openat_syscall_event[] = {
+	TEST_CASE_REASON("Detect openat syscall event",
+			 openat_syscall_event,
+			 "permissions"),
+	{	.name = NULL, }
+};
+
+struct test_suite suite__openat_syscall_event = {
+	.desc = "Detect openat syscall event",
+	.test_cases = tests__openat_syscall_event,
+};