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, 150 insertions, 0 deletions

diff --git a/tools/perf/util/expr.l b/tools/perf/util/expr.l
new file mode 100644
index 000000000..f16ccff27
--- /dev/null
+++ b/tools/perf/util/expr.l
@@ -0,0 +1,150 @@
+%option prefix="expr_"
+%option reentrant
+%option bison-bridge
+
+%{
+#include <linux/compiler.h>
+#include "expr.h"
+#include "expr-bison.h"
+#include <math.h>
+
+char *expr_get_text(yyscan_t yyscanner);
+YYSTYPE *expr_get_lval(yyscan_t yyscanner);
+
+static double __value(YYSTYPE *yylval, char *str, int token)
+{
+	double num;
+
+	errno = 0;
+	num = strtod(str, NULL);
+	if (errno)
+		return EXPR_ERROR;
+
+	yylval->num = num;
+	return token;
+}
+
+static int value(yyscan_t scanner)
+{
+	YYSTYPE *yylval = expr_get_lval(scanner);
+	char *text = expr_get_text(scanner);
+
+	return __value(yylval, text, NUMBER);
+}
+
+/*
+ * Allow @ instead of / to be able to specify pmu/event/ without
+ * conflicts with normal division.
+ */
+static char *normalize(char *str, int runtime)
+{
+	char *ret = str;
+	char *dst = str;
+
+	while (*str) {
+		if (*str == '\\') {
+			*dst++ = *++str;
+			if (!*str)
+				break;
+		}
+		else if (*str == '?') {
+			char *paramval;
+			int i = 0;
+			int size = asprintf(&paramval, "%d", runtime);
+
+			if (size < 0)
+				*dst++ = '0';
+			else {
+				while (i < size)
+					*dst++ = paramval[i++];
+				free(paramval);
+			}
+		}
+		else
+			*dst++ = *str;
+		str++;
+	}
+
+	*dst = 0x0;
+	return ret;
+}
+
+static int str(yyscan_t scanner, int token, int runtime)
+{
+	YYSTYPE *yylval = expr_get_lval(scanner);
+	char *text = expr_get_text(scanner);
+
+	yylval->str = normalize(strdup(text), runtime);
+	if (!yylval->str)
+		return EXPR_ERROR;
+
+	yylval->str = normalize(yylval->str, runtime);
+	return token;
+}
+
+static int literal(yyscan_t scanner, const struct expr_scanner_ctx *sctx)
+{
+	YYSTYPE *yylval = expr_get_lval(scanner);
+
+	yylval->num = expr__get_literal(expr_get_text(scanner), sctx);
+	if (isnan(yylval->num)) {
+		if (!sctx->is_test)
+			return EXPR_ERROR;
+		yylval->num = 1;
+	}
+	return LITERAL;
+}
+
+static int nan_value(yyscan_t scanner)
+{
+	YYSTYPE *yylval = expr_get_lval(scanner);
+
+	yylval->num = NAN;
+	return NUMBER;
+}
+%}
+
+number		([0-9]+\.?[0-9]*|[0-9]*\.?[0-9]+)(e-?[0-9]+)?
+
+sch		[-,=]
+spec		\\{sch}
+sym		[0-9a-zA-Z_\.:@?]+
+symbol		({spec}|{sym})+
+literal		#[0-9a-zA-Z_\.\-]+
+
+%%
+	struct expr_scanner_ctx *sctx = expr_get_extra(yyscanner);
+
+d_ratio		{ return D_RATIO; }
+max		{ return MAX; }
+min		{ return MIN; }
+if		{ return IF; }
+else		{ return ELSE; }
+source_count	{ return SOURCE_COUNT; }
+aggr_nr		{ return AGGR_NR; }
+has_event	{ return HAS_EVENT; }
+strcmp_cpuid_str	{ return STRCMP_CPUID_STR; }
+NaN		{ return nan_value(yyscanner); }
+{literal}	{ return literal(yyscanner, sctx); }
+{number}	{ return value(yyscanner); }
+{symbol}	{ return str(yyscanner, ID, sctx->runtime); }
+"|"		{ return '|'; }
+"^"		{ return '^'; }
+"&"		{ return '&'; }
+"<"		{ return '<'; }
+">"		{ return '>'; }
+"-"		{ return '-'; }
+"+"		{ return '+'; }
+"*"		{ return '*'; }
+"/"		{ return '/'; }
+"%"		{ return '%'; }
+"("		{ return '('; }
+")"		{ return ')'; }
+","		{ return ','; }
+.		{ }
+%%
+
+int expr_wrap(void *scanner __maybe_unused)
+{
+	return 1;
+}