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From: Adrian Hunter <adrian.hunter@intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] perf tools: Amend dlfilter documentation wrt library dependencies
Date: Tue, 10 Aug 2021 14:48:11 +0300	[thread overview]
Message-ID: <20210810114813.12951-4-adrian.hunter@intel.com> (raw)
In-Reply-To: <20210810114813.12951-1-adrian.hunter@intel.com>

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
uses.

Note those things in the documentation.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 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 dlfilter-example.so
 
+NOTES
+-----
+
+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.
+
 SEE ALSO
 --------
 linkperf:perf-script[1]
-- 
2.17.1


  parent reply	other threads:[~2021-08-10 11:48 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-10 11:48 [PATCH 0/5] perf tools: Add dlfilter test Adrian Hunter
2021-08-10 11:48 ` [PATCH 1/5] perf script: Fix unnecessary machine_resolve() Adrian Hunter
2021-08-10 18:25   ` Arnaldo Carvalho de Melo
2021-08-11 10:18     ` Adrian Hunter
2021-08-10 11:48 ` [PATCH 2/5] perf script: Fix --list-dlfilters documentation Adrian Hunter
2021-08-10 18:28   ` Arnaldo Carvalho de Melo
2021-08-10 11:48 ` Adrian Hunter [this message]
2021-08-10 11:48 ` [PATCH 4/5] perf tools: Move perf_dlfilters.h in the source tree Adrian Hunter
2021-08-10 11:48 ` [PATCH 5/5] perf tools: Add dlfilter test Adrian Hunter
2021-08-10 18:32   ` Arnaldo Carvalho de Melo
2021-08-10 19:06     ` Adrian Hunter
2021-08-10 20:21       ` Arnaldo Carvalho de Melo
2021-08-11 10:10         ` Adrian Hunter

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