linux-kernel - [PATCH 07/19] perf report: Document +field style argument support for --field option

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Date:   Tue, 14 Mar 2017 15:50:11 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 07/19] perf report: Document +field style argument support for --field option

From: Changbin Du <changbin.du@...el.com>

Commit 2f3f9bcf000b ("perf tools: Add +field argument support for
--field option") by Jiri Olsa <jolsa@...nel.org> introduced +field style
argument support for --field option.

This is useful but not updated documentation.  This add a little
description there.

Signed-off-by: Changbin Du <changbin.du@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20170313083252.23644-1-changbin.du@intel.com
[ Slightly improved the phrase structure ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Documentation/perf-report.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 33f91906f5dc..672b149aa80a 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -173,6 +173,9 @@ OPTIONS
 	By default, every sort keys not specified in -F will be appended
 	automatically.
 
+	If the keys starts with a prefix '+', then it will append the specified
+        field(s) to the default field order. For example: perf report -F +period,sample.
+
 -p::
 --parent=<regex>::
         A regex filter to identify parent. The parent is a caller of this
-- 
2.9.3