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Subject[tip:perf/core] perf kvm: Add more detail about buildid-list in man page
Commit-ID:  ed086d5b8a793955981f0726d8d66a03d801279b
Author: Dongsheng Yang <>
AuthorDate: Wed, 4 Dec 2013 17:56:42 -0500
Committer: Arnaldo Carvalho de Melo <>
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

Signed-off-by: Dongsheng Yang <>
Cc: David Ahern <>
Cc: Ingo Molnar <>
Cc: Jiri Olsa <>
Cc: Paul Mackerras <>
Cc: Peter Zijlstra <>
Signed-off-by: Arnaldo Carvalho de Melo <>
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

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