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

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Date:   Fri, 27 Oct 2023 10:43:32 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...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

Hello,

On 2023/10/27 6:08, Namhyung Kim wrote:
> Hi Arnaldo,
> 
> On Thu, Oct 26, 2023 at 12:47 PM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
>>
>> 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.
> 
> Thanks for fixing this.  I prefer having a separate fix.
> Please send it as a formal patch.
> 

Sorry, only rename helper and no function change.
I didn't consider the scenario that might affect test python.

I've submitted a fix that can be used if needed:

https://lore.kernel.org/lkml/20231027023028.1106441-1-yangjihong1@huawei.com/

Also, can we consider identifying this problem at the stage of compiling 
the perf tool?


Thanks,
Yang