perf stat: Use percentages for scaling output

Peter expressed a strong preference for percentage based
display of scaled values - so revert to that from the
recently introduced multiplication-factor unit.
Reported-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Jaswinder Singh Rajput <jaswinder@kernel.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

tools/perf/builtin-stat.c

@@ -307,7 +307,8 @@ static void print_counter(int counter)
 		abs_printout(counter, count, noise);
 
 	if (scaled)
-		fprintf(stderr, "  (%7.2fx scaled)", (double)count[1]/count[2]);
+		fprintf(stderr, "  (scaled from %.2f%%)",
+			(double) count[2] / count[1] * 100);
 
 	fprintf(stderr, "\n");
 }