linux-kernel - Re: [PATCH] perf evsel: Rename evsel__increase_rlimit to rlimit__increase

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Date:   Thu, 26 Oct 2023 16:47:23 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Yang Jihong <yangjihong1@...wei.com>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        irogers@...gle.com, adrian.hunter@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf evsel: Rename evsel__increase_rlimit to
 rlimit__increase_nofile

Em Mon, Oct 23, 2023 at 03:31:44AM +0000, Yang Jihong escreveu:
> evsel__increase_rlimit() helper does nothing with evsel, and description
> of the functionality is inaccurate, rename it and move to util/rlimit.c.
 
> By the way, fix a checkppatch warning about misplaced license tag:
 
>   WARNING: Misplaced SPDX-License-Identifier tag - use line 1 instead
>   #160: FILE: tools/perf/util/rlimit.h:3:
>   /* SPDX-License-Identifier: LGPL-2.1 */
 
> No functional change.

Please run 'perf test' before sending patches upstream, I'm checking if
what is in perf-tools-next/perf-tools-next is building and I noticed
this:

⬢[acme@...lbox perf-tools-next]$ perf test -v python
Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc
 14: 'import perf' in python                                         :
--- start ---
test child forked, pid 2912462
python usage test: "echo "import sys ; sys.path.insert(0, '/tmp/build/perf-tools-next/python'); import perf" | '/usr/bin/python3' "
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /tmp/build/perf-tools-next/python/perf.cpython-311-x86_64-linux-gnu.so: undefined symbol: rlimit__increase_nofile
test child finished with -1
---- end ----
'import perf' in python: FAILED!
⬢[acme@...lbox perf-tools-next]$

The following patch cures it, Namhyung, can you please fold it and force
push perf-tools-next/perf-tools-next or let me know if you prefer that I
submit a patch fixing this separately.

- Arnaldo

diff --git a/tools/perf/util/python-ext-sources b/tools/perf/util/python-ext-sources
index 26e1c8d973ea0b95..593b660ec75e24e1 100644
--- a/tools/perf/util/python-ext-sources
+++ b/tools/perf/util/python-ext-sources
@@ -40,6 +40,7 @@ util/rwsem.c
 util/hashmap.c
 util/perf_regs.c
 util/fncache.c
+util/rlimit.c
 util/perf-regs-arch/perf_regs_aarch64.c
 util/perf-regs-arch/perf_regs_arm.c
 util/perf-regs-arch/perf_regs_csky.c