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, 122 insertions, 0 deletions

diff --git a/tools/perf/util/help-unknown-cmd.c b/tools/perf/util/help-unknown-cmd.c
new file mode 100644
index 000000000..a0a46e34f
--- /dev/null
+++ b/tools/perf/util/help-unknown-cmd.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "cache.h"
+#include "config.h"
+#include <poll.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <subcmd/help.h>
+#include "../builtin.h"
+#include "levenshtein.h"
+#include <linux/zalloc.h>
+
+static int autocorrect;
+
+static int perf_unknown_cmd_config(const char *var, const char *value,
+				   void *cb __maybe_unused)
+{
+	if (!strcmp(var, "help.autocorrect"))
+		return perf_config_int(&autocorrect, var,value);
+
+	return 0;
+}
+
+static int levenshtein_compare(const void *p1, const void *p2)
+{
+	const struct cmdname *const *c1 = p1, *const *c2 = p2;
+	const char *s1 = (*c1)->name, *s2 = (*c2)->name;
+	int l1 = (*c1)->len;
+	int l2 = (*c2)->len;
+	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
+}
+
+static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
+{
+	unsigned int i, nr = cmds->cnt + old->cnt;
+	void *tmp;
+
+	if (nr > cmds->alloc) {
+		/* Choose bigger one to alloc */
+		if (alloc_nr(cmds->alloc) < nr)
+			cmds->alloc = nr;
+		else
+			cmds->alloc = alloc_nr(cmds->alloc);
+		tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
+		if (!tmp)
+			return -1;
+		cmds->names = tmp;
+	}
+	for (i = 0; i < old->cnt; i++)
+		cmds->names[cmds->cnt++] = old->names[i];
+	zfree(&old->names);
+	old->cnt = 0;
+	return 0;
+}
+
+const char *help_unknown_cmd(const char *cmd, struct cmdnames *main_cmds)
+{
+	unsigned int i, n = 0, best_similarity = 0;
+	struct cmdnames other_cmds;
+
+	memset(&other_cmds, 0, sizeof(other_cmds));
+
+	perf_config(perf_unknown_cmd_config, NULL);
+
+	load_command_list("perf-", main_cmds, &other_cmds);
+
+	if (add_cmd_list(main_cmds, &other_cmds) < 0) {
+		fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
+		goto end;
+	}
+	qsort(main_cmds->names, main_cmds->cnt,
+	      sizeof(main_cmds->names), cmdname_compare);
+	uniq(main_cmds);
+
+	if (main_cmds->cnt) {
+		/* This reuses cmdname->len for similarity index */
+		for (i = 0; i < main_cmds->cnt; ++i) {
+			main_cmds->names[i]->len =
+				levenshtein(cmd, main_cmds->names[i]->name,
+					/*swap_penalty=*/0,
+					/*substition_penality=*/2,
+					/*insertion_penality=*/1,
+					/*deletion_penalty=*/1);
+		}
+		qsort(main_cmds->names, main_cmds->cnt,
+		      sizeof(*main_cmds->names), levenshtein_compare);
+
+		best_similarity = main_cmds->names[0]->len;
+		n = 1;
+		while (n < main_cmds->cnt && best_similarity == main_cmds->names[n]->len)
+			++n;
+	}
+
+	if (autocorrect && n == 1) {
+		const char *assumed = main_cmds->names[0]->name;
+
+		main_cmds->names[0] = NULL;
+		clean_cmdnames(&other_cmds);
+		fprintf(stderr, "WARNING: You called a perf program named '%s', "
+			"which does not exist.\n"
+			"Continuing under the assumption that you meant '%s'\n",
+			cmd, assumed);
+		if (autocorrect > 0) {
+			fprintf(stderr, "in %0.1f seconds automatically...\n",
+				(float)autocorrect/10.0);
+			poll(NULL, 0, autocorrect * 100);
+		}
+		return assumed;
+	}
+
+	fprintf(stderr, "perf: '%s' is not a perf-command. See 'perf --help'.\n", cmd);
+
+	if (main_cmds->cnt && best_similarity < 6) {
+		fprintf(stderr, "\nDid you mean %s?\n",
+			n < 2 ? "this": "one of these");
+
+		for (i = 0; i < n; i++)
+			fprintf(stderr, "\t%s\n", main_cmds->names[i]->name);
+	}
+end:
+	clean_cmdnames(&other_cmds);
+	return NULL;
+}