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