linux-kernel - [PATCH v2 8/8] perf sched: Add documentation for timehist options

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Date:   Wed, 16 Nov 2016 15:06:34 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        David Ahern <dsahern@...il.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <andi@...stfloor.org>
Subject: [PATCH v2 8/8] perf sched: Add documentation for timehist options

From: David Ahern <dsahern@...il.com>

Add entry to perf-sched documentation for timehist command and its
options.

Signed-off-by: David Ahern <dsahern@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/Documentation/perf-sched.txt | 46 +++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt
index 1cc08cc47ac5..a0344643f008 100644
--- a/tools/perf/Documentation/perf-sched.txt
+++ b/tools/perf/Documentation/perf-sched.txt
@@ -8,11 +8,11 @@ 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
 -----------
-There are five variants of perf sched:
+There are several variants of perf sched:
 
   'perf sched record <command>' to record the scheduling events
   of an arbitrary workload.
@@ -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::
@@ -66,6 +71,43 @@ OPTIONS for 'perf sched map'
 --color-pids::
 	Highlight the given pids.
 
+OPTIONS for 'perf sched timehist'
+---------------------------------
+-k::
+--vmlinux=<file>::
+    vmlinux pathname
+
+--kallsyms=<file>::
+    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.
+
+--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: 5
+
+--symfs=<directory>::
+    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]
-- 
2.10.1