From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758441Ab3EZA0w (ORCPT ); Sat, 25 May 2013 20:26:52 -0400 Received: from mail-pa0-f42.google.com ([209.85.220.42]:38817 "EHLO mail-pa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758479Ab3EZA0s (ORCPT ); Sat, 25 May 2013 20:26:48 -0400 From: David Ahern To: linux-kernel@vger.kernel.org Cc: acme@ghostprotocols.net, mingo@kernel.org, fweisbec@gmail.com, peterz@infradead.org, jolsa@redhat.com, namhyung@kernel.org, xiaoguangrong@linux.vnet.ibm.com, runzhen@linux.vnet.ibm.com, David Ahern Subject: [PATCH 09/16] perf stats: add max and min stats Date: Sat, 25 May 2013 18:24:49 -0600 Message-Id: <1369527896-3650-10-git-send-email-dsahern@gmail.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1369527896-3650-1-git-send-email-dsahern@gmail.com> References: <1369527896-3650-1-git-send-email-dsahern@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Need an initialization function to set min to -1 to differentiate from an actual min of 0. Signed-off-by: David Ahern Cc: Arnaldo Carvalho de Melo Cc: Ingo Molnar Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Jiri Olsa Cc: Namhyung Kim Cc: Xiao Guangrong Cc: Runzhen Wang --- tools/perf/util/stat.c | 6 ++++++ tools/perf/util/stat.h | 9 +++++++++ 2 files changed, 15 insertions(+) diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c index 7c59c28..6506b3d 100644 --- a/tools/perf/util/stat.c +++ b/tools/perf/util/stat.c @@ -10,6 +10,12 @@ void update_stats(struct stats *stats, u64 val) delta = val - stats->mean; stats->mean += delta / stats->n; stats->M2 += delta*(val - stats->mean); + + if (val > stats->max) + stats->max = val; + + if (val < stats->min) + stats->min = val; } double avg_stats(struct stats *stats) diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h index 588367c..ae8ccd7 100644 --- a/tools/perf/util/stat.h +++ b/tools/perf/util/stat.h @@ -6,6 +6,7 @@ struct stats { double n, mean, M2; + u64 max, min; }; void update_stats(struct stats *stats, u64 val); @@ -13,4 +14,12 @@ double avg_stats(struct stats *stats); double stddev_stats(struct stats *stats); double rel_stddev_stats(double stddev, double avg); +static inline void init_stats(struct stats *stats) +{ + stats->n = 0.0; + stats->mean = 0.0; + stats->M2 = 0.0; + stats->min = (u64) -1; + stats->max = 0; +} #endif -- 1.7.10.1