linux-kernel - [tip:perf/core] perf kvm: Add more detail about buildid-list in man page

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Message-ID: <tip-ed086d5b8a793955981f0726d8d66a03d801279b@git.kernel.org>
Date:	Tue, 10 Dec 2013 01:16:45 -0800
From:	tip-bot for Dongsheng Yang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	mingo@...hat.com, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, jolsa@...hat.com, dsahern@...il.com,
	tglx@...utronix.de, yangds.fnst@...fujitsu.com
Subject: [tip:perf/core] perf kvm:
  Add more detail about buildid-list in man page

Commit-ID:  ed086d5b8a793955981f0726d8d66a03d801279b
Gitweb:     http://git.kernel.org/tip/ed086d5b8a793955981f0726d8d66a03d801279b
Author:     Dongsheng Yang <yangds.fnst@...fujitsu.com>
AuthorDate: Wed, 4 Dec 2013 17:56:42 -0500
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 4 Dec 2013 15:02:47 -0300

perf kvm: Add more detail about buildid-list in man page

As the buildid is read from /sys/kernel/notes, then if we use perf kvm
buildid-list with a perf data file captured by perf kvm record with
--guestkallsyms and --guestmodules, there is no result in output.

This patch add a explanation about it and add a limit of using perf kvm
buildid-list.

Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/d605a805486340b53bc261aa64d7632ad0a8cf53.1386197481.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Documentation/perf-kvm.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt
index 6a06cef..f52f94d 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -37,7 +37,9 @@ There are a couple of variants of perf kvm:
 
   'perf kvm buildid-list' to  display the buildids found in a perf data file,
   so that other tools can be used to fetch packages with matching symbol tables
-  for use by perf report.
+  for use by perf report. As buildid is read from /sys/kernel/notes in os, then
+  if you want to list the buildid for guest, please make sure your perf data file
+  was captured with --guestmount in perf kvm record.
 
   'perf kvm stat <command>' to run a command and gather performance counter
   statistics.
--
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