[PATCH 4/5] perf tools: Add more detail about buildid-list in Document of perf-kvm.

[Dongsheng Yang]

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@xxxxxxxxxxxxxx>
---
 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 830613a..be1d263 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -44,7 +44,9 @@ 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.
-- 
1.8.2.1

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