linux-kernel - Re: [PATCH 4/9] perf tools: Maintain cgroup hierarchy

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Message-ID: <20200403123606.GC23243@kernel.org>
Date:   Fri, 3 Apr 2020 09:36:06 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [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 <acme@...hat.com>
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@...e ~]# 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/perf.cpython-37m-x86_64-linux-gnu.so: undefined symbol: down_write
  test child finished with -1
  ---- end ----
  'import perf' in python: FAILED!
  [root@...e ~]#

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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
 util/symbol_fprintf.c
 util/units.c
 util/affinity.c
+util/rwsem.c
-- 
2.25.1