linux-kernel - Re: [PATCH v5 5/5] perf-stat: introduce bpf_counter

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Message-ID: <YIhpCuTPWPwURiQh@kernel.org>
Date:   Tue, 27 Apr 2021 16:42:02 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Song Liu <song@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, acme@...hat.com,
        namhyung@...nel.org, jolsa@...nel.org, songliubraving@...com
Subject: Re: [PATCH v5 5/5] perf-stat: introduce bpf_counter_ops->disable()

Em Tue, Apr 27, 2021 at 04:27:22PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Sun, Apr 25, 2021 at 02:43:33PM -0700, Song Liu escreveu:
> > Introduce bpf_counter_ops->disable(), which is used stop counting the
> > event.
> 
> [acme@...e perf]$ perf test -v python
> Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc
> 19: 'import perf' in python                                         :
> --- start ---
> test child forked, pid 1497924
> python usage test: "echo "import sys ; sys.path.append('/tmp/build/perf/python'); import perf" | '/usr/bin/python3' "
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: /tmp/build/perf/python/perf.cpython-39-x86_64-linux-gnu.so: undefined symbol: bpf_counter__disable
> test child finished with -1
> ---- end ----
> 'import perf' in python: FAILED!
> [acme@...e perf]$
> 
> I'll fix this up in my local tree, if you need to respin, please pick
> patches from tmp.perf/core, will refresh it later today.

Added this:


diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 278abecb5bdfc0d2..27940edb161c2d8c 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -100,6 +100,11 @@ int bpf_counter__install_pe(struct evsel *evsel __maybe_unused, int cpu __maybe_
 	return 0;
 }
 
+int bpf_counter__disable(struct evsel *evsel __maybe_unused)
+{
+	return 0;
+}
+
 /*
  * Support debug printing even though util/debug.c is not linked.  That means
  * implementing 'verbose' and 'eprintf'.