From ed086d5b8a793955981f0726d8d66a03d801279b Mon Sep 17 00:00:00 2001 From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Date: Wed, 4 Dec 2013 17:56:42 -0500 Subject: [PATCH] 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@cn.fujitsu.com> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/d605a805486340b53bc261aa64d7632ad0a8cf53.1386197481.git.yangds.fnst@cn.fujitsu.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 6a06cefe96427..f52f94d9f66b9 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. -- 2.30.2