perf stat: Fix metrics with --no-merge

Since Fixes: 8c5421c0 ("perf pmu: Display pmu name when printing
unmerged events in stat") using --no-merge adds the PMU name to the
evsel name.

This breaks the metric value lookup because the parser doesn't know
about this.

Remove the extra postfixes for the metric evaluation.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Agustin Vega-Frias <agustinv@codeaurora.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Fixes: 8c5421c0 ("perf pmu: Display pmu name when printing unmerged events in stat")
Link: http://lkml.kernel.org/r/20190624193711.35241-5-andi@firstfloor.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat-shadow.c

@@ -724,6 +724,7 @@ static void generic_metric(struct perf_stat_config *config,
 	double ratio;
 	int i;
 	void *ctxp = out->ctx;
+	char *n, *pn;
 
 	expr__ctx_init(&pctx);
 	expr__add_id(&pctx, name, avg);
@@ -743,7 +744,19 @@ static void generic_metric(struct perf_stat_config *config,
 			stats = &v->stats;
 			scale = 1.0;
 		}
-		expr__add_id(&pctx, metric_events[i]->name, avg_stats(stats)*scale);
+
+		n = strdup(metric_events[i]->name);
+		if (!n)
+			return;
+		/*
+		 * This display code with --no-merge adds [cpu] postfixes.
+		 * These are not supported by the parser. Remove everything
+		 * after the space.
+		 */
+		pn = strchr(n, ' ');
+		if (pn)
+			*pn = 0;
+		expr__add_id(&pctx, n, avg_stats(stats)*scale);
 	}
 	if (!metric_events[i]) {
 		const char *p = metric_expr;
@@ -760,6 +773,9 @@ static void generic_metric(struct perf_stat_config *config,
 				     (metric_name ? metric_name : name) : "", 0);
 	} else
 		print_metric(config, ctxp, NULL, NULL, "", 0);
+
+	for (i = 1; i < pctx.num_ids; i++)
+		free((void *)pctx.ids[i].name);
 }
 
 void perf_stat__print_shadow_stats(struct perf_stat_config *config,