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SubjectRe: [PATCH 4/9] perf tools: Maintain cgroup hierarchy
Em Wed, Mar 25, 2020 at 09:45:31PM +0900, Namhyung Kim escreveu:
> Each cgroup is kept in the perf_env's cgroup_tree sorted by the cgroup
> id. Hist entries have cgroup id can compare it directly and later it
> can be used to find a group name using this tree.

This one breaks the 'perf test python' test, I fixed it adding this
patch before your series:

From ea3c4ab73cb2ea2960bba6894560b1ef91e69737 Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <>
Date: Fri, 3 Apr 2020 09:29:52 -0300
Subject: [PATCH 1/1] perf python: Include rwsem.c in the pythong biding

We'll need it for the cgroup patches, and its better to have it in a
separate patch in case we need to later revert the cgroup patches.

I.e. without this we have:

[root@five ~]# perf test -v python
19: 'import perf' in python :
--- start ---
test child forked, pid 148447
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: /tmp/build/perf/python/ undefined symbol: down_write
test child finished with -1
---- end ----
'import perf' in python: FAILED!
[root@five ~]#

Cc: Adrian Hunter <>
Cc: Alexander Shishkin <>
Cc: Jiri Olsa <>
Cc: Mark Rutland <>
Cc: Namhyung Kim <>
Cc: Peter Zijlstra <>
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/util/python-ext-sources | 1 +
1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/python-ext-sources b/tools/perf/util/python-ext-sources
index e7279ea6043a..a9d9c142eb7c 100644
--- a/tools/perf/util/python-ext-sources
+++ b/tools/perf/util/python-ext-sources
@@ -34,3 +34,4 @@ util/string.c
 \ /
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