From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752263Ab3LBAXo (ORCPT ); Sun, 1 Dec 2013 19:23:44 -0500 Received: from mail-pd0-f173.google.com ([209.85.192.173]:38433 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752154Ab3LBAXi (ORCPT ); Sun, 1 Dec 2013 19:23:38 -0500 From: David Ahern To: acme@ghostprotocols.net, linux-kernel@vger.kernel.org Cc: namhyung@kernel.org, David Ahern , Ingo Molnar , Frederic Weisbecker , Peter Zijlstra , Mike Galbraith , Jiri Olsa , Stephane Eranian , Pekka Enberg Subject: [PATCH 2/2] perf sched: Add documentation for timehist options Date: Sun, 1 Dec 2013 17:23:15 -0700 Message-Id: <1385943795-11761-3-git-send-email-dsahern@gmail.com> X-Mailer: git-send-email 1.8.3.4 (Apple Git-47) In-Reply-To: <1385943795-11761-1-git-send-email-dsahern@gmail.com> References: <1385943795-11761-1-git-send-email-dsahern@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add entry to perf-sched documentation for timehist command and its options. v2: Addressed comments by Namhyung Signed-off-by: David Ahern Cc: Ingo Molnar Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Jiri Olsa Cc: Namhyung Kim Cc: Stephane Eranian Cc: Pekka Enberg --- tools/perf/Documentation/perf-sched.txt | 61 ++++++++++++++++++++++++++++++++- 1 file changed, 60 insertions(+), 1 deletion(-) diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 8ff4df956951..e7bb19fcdbff 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -8,7 +8,7 @@ perf-sched - Tool to trace/measure scheduler properties (latencies) SYNOPSIS -------- [verse] -'perf sched' {record|latency|map|replay|script} +'perf sched' {record|latency|map|replay|script|timehist} DESCRIPTION ----------- @@ -36,6 +36,11 @@ There are five variants of perf sched: are running on a CPU. A '*' denotes the CPU that had the event, and a dot signals an idle CPU. + 'perf sched timehist' to show context-switching analysis with times + between schedule-in, schedule delay, and run time. If callchains are + present stack trace is dumped at the end of the line. A summary of + run times can be shown as well. + OPTIONS ------- -i:: @@ -50,6 +55,60 @@ OPTIONS --dump-raw-trace=:: Display verbose dump of the sched data. +TIMEHIST OPTIONS +---------------- +-k:: +--vmlinux=:: + vmlinux pathname + +--kallsyms=:: + kallsyms pathname + +-s:: +--summary:: + Show only a summary of scheduling by thread with min, max, and average + run times (in sec) and relative stddev. + +-S:: +--with-summary:: + Show all scheduling events followed by a summary by thread with min, + max, and average run times (in sec) and relative stddev. + +-w:: +--wakeups:: + Show wakeup events. + +-c:: +--comms=:: + Only show events for given comms (comma separated list) + +-p:: +--pid=:: + Only show events for given process ID (comma separated list). + +-t:: +--tid=:: + Only show events for given thread ID (comma separated list). + +--call-graph:: + Display call chains. Default is on. Use --no-call-graph to suppress + +--max-stack:: + Set the stack depth limit when showing the callchains. Default: 127 + +-x:: +--exclude-sym:: + Symbols to skip in backtrace. Useful to compact repetitive or + uninteresting frames to pull more useful frames into view. + +--symfs=:: + Look for files with symbols relative to this directory. + +-V:: +--cpu-visual:: + Add a visual that better emphasizes activity by cpu. Idle times + are denoted with 'i'; schedule events with an 's'. + SEE ALSO -------- linkperf:perf-record[1] -- 1.8.3.4 (Apple Git-47)