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, 118 insertions, 0 deletions

diff --git a/tools/perf/util/trace-event.c b/tools/perf/util/trace-event.c
new file mode 100644
index 000000000..6a8c66c64
--- /dev/null
+++ b/tools/perf/util/trace-event.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <event-parse.h>
+#include <api/fs/tracing_path.h>
+#include <api/fs/fs.h>
+#include "trace-event.h"
+#include "machine.h"
+
+/*
+ * global trace_event object used by trace_event__tp_format
+ *
+ * TODO There's no cleanup call for this. Add some sort of
+ * __exit function support and call trace_event__cleanup
+ * there.
+ */
+static struct trace_event tevent;
+static bool tevent_initialized;
+
+int trace_event__init(struct trace_event *t)
+{
+	struct tep_handle *pevent = tep_alloc();
+
+	if (pevent) {
+		t->plugin_list = tep_load_plugins(pevent);
+		t->pevent  = pevent;
+	}
+
+	return pevent ? 0 : -1;
+}
+
+static int trace_event__init2(void)
+{
+	int be = tep_is_bigendian();
+	struct tep_handle *pevent;
+
+	if (trace_event__init(&tevent))
+		return -1;
+
+	pevent = tevent.pevent;
+	tep_set_flag(pevent, TEP_NSEC_OUTPUT);
+	tep_set_file_bigendian(pevent, be);
+	tep_set_local_bigendian(pevent, be);
+	tevent_initialized = true;
+	return 0;
+}
+
+int trace_event__register_resolver(struct machine *machine,
+				   tep_func_resolver_t *func)
+{
+	if (!tevent_initialized && trace_event__init2())
+		return -1;
+
+	return tep_set_function_resolver(tevent.pevent, func, machine);
+}
+
+void trace_event__cleanup(struct trace_event *t)
+{
+	tep_unload_plugins(t->plugin_list, t->pevent);
+	tep_free(t->pevent);
+}
+
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
+static struct tep_event*
+tp_format(const char *sys, const char *name)
+{
+	char *tp_dir = get_events_file(sys);
+	struct tep_handle *pevent = tevent.pevent;
+	struct tep_event *event = NULL;
+	char path[PATH_MAX];
+	size_t size;
+	char *data;
+	int err;
+
+	if (!tp_dir)
+		return ERR_PTR(-errno);
+
+	scnprintf(path, PATH_MAX, "%s/%s/format", tp_dir, name);
+	put_events_file(tp_dir);
+
+	err = filename__read_str(path, &data, &size);
+	if (err)
+		return ERR_PTR(err);
+
+	tep_parse_format(pevent, &event, data, size, sys);
+
+	free(data);
+	return event;
+}
+
+/*
+ * Returns pointer with encoded error via <linux/err.h> interface.
+ */
+struct tep_event*
+trace_event__tp_format(const char *sys, const char *name)
+{
+	if (!tevent_initialized && trace_event__init2())
+		return ERR_PTR(-ENOMEM);
+
+	return tp_format(sys, name);
+}
+
+struct tep_event *trace_event__tp_format_id(int id)
+{
+	if (!tevent_initialized && trace_event__init2())
+		return ERR_PTR(-ENOMEM);
+
+	return tep_find_event(tevent.pevent, id);
+}