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Date:   Tue, 10 Aug 2021 14:48:11 +0300
From:   Adrian Hunter <>
To:     Arnaldo Carvalho de Melo <>
Cc:     Jiri Olsa <>,
Subject: [PATCH 3/5] perf tools: Amend dlfilter documentation wrt library dependencies

Like all locally-built programs, dlfilters may need to be re-built if
shared libraries they use change. Also there may be unexpected results
if the dfilter uses different versions of the shared libraries that perf

Note those things in the documentation.

Signed-off-by: Adrian Hunter <>
 tools/perf/Documentation/perf-dlfilter.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/Documentation/perf-dlfilter.txt b/tools/perf/Documentation/perf-dlfilter.txt
index 02842cb4cf90..322510d3ec0c 100644
--- a/tools/perf/Documentation/perf-dlfilter.txt
+++ b/tools/perf/Documentation/perf-dlfilter.txt
@@ -246,6 +246,14 @@ To use the filter with perf script:
 	perf script --dlfilter
+The dlfilter .so file will be dependent on shared libraries. If those change,
+it may be necessary to rebuild the .so. Also there may be unexpected results
+if the .so uses different versions of the shared libraries that perf uses.
+Versions can be checked using the ldd command.

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