Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754287AbZJRLaS (ORCPT ); Sun, 18 Oct 2009 07:30:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752844AbZJRLaS (ORCPT ); Sun, 18 Oct 2009 07:30:18 -0400 Received: from ozlabs.org ([203.10.76.45]:42411 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752638AbZJRLaR (ORCPT ); Sun, 18 Oct 2009 07:30:17 -0400 Date: Sun, 18 Oct 2009 22:29:23 +1100 From: Anton Blanchard To: mingo@elte.hu, paulus@samba.org, a.p.zijlstra@chello.nl Cc: linux-kernel@vger.kernel.org Subject: [PATCH] perf stat: Add branch performance metric Message-ID: <20091018112923.GQ4808@kryten> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1894 Lines: 55 When we count both branches and branch-misses it is useful to print out the percentage of branch-misses: # perf stat -e branches -e branch-misses /bin/true Performance counter stats for '/bin/true': 401684 branches # 0.000 M/sec 23301 branch-misses # 5.801 % Signed-off-by: Anton Blanchard --- diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 3db31e7..6a2e37e 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -125,6 +125,7 @@ struct stats event_res_stats[MAX_COUNTERS][3]; struct stats runtime_nsecs_stats; struct stats walltime_nsecs_stats; struct stats runtime_cycles_stats; +struct stats runtime_branches_stats; #define MATCH_EVENT(t, c, counter) \ (attrs[counter].type == PERF_TYPE_##t && \ @@ -235,6 +237,8 @@ static void read_counter(int counter) update_stats(&runtime_nsecs_stats, count[0]); if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) update_stats(&runtime_cycles_stats, count[0]); + if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter)) + update_stats(&runtime_branches_stats, count[0]); } static int run_perf_stat(int argc __used, const char **argv) @@ -352,6 +356,14 @@ static void abs_printout(int counter, double avg) ratio = avg / total; fprintf(stderr, " # %10.3f IPC ", ratio); + } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter)) { + total = avg_stats(&runtime_branches_stats); + + if (total) + ratio = avg * 100 / total; + + fprintf(stderr, " # %10.3f %% ", ratio); + } else { total = avg_stats(&runtime_nsecs_stats); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/