linux-kernel - Re: [PATCH 1/2] perf tools: Decompress kernel module when reading DSO data

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Date:   Sat, 3 Jun 2017 10:43:43 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
        David Ahern <dsahern@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/2] perf tools: Decompress kernel module when reading DSO data

On Thu, Jun 1, 2017 at 8:29 PM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Thu, Jun 01, 2017 at 06:06:04PM +0900, Namhyung Kim wrote:
>
> SNIP
>
>> -     }
>> -
>> -     unlink(tmpbuf);
>> -
>> -out:
>> -     free(m.ext);
>> -     return fd;
>> -}
>> -
>>  bool symsrc__possibly_runtime(struct symsrc *ss)
>>  {
>>       return ss->dynsym || ss->opdsec;
>> @@ -702,9 +668,13 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
>>       int fd;
>>
>>       if (dso__needs_decompress(dso)) {
>> -             fd = decompress_kmodule(dso, name, type);
>> +             char buf[32];
>> +
>> +             fd = dso__decompress_kmodule(dso, name, buf, sizeof(buf));
>>               if (fd < 0)
>>                       return -1;
>> +
>> +             unlink(buf);
>
> I wonder we could make this more clear and add:
>
>   dso__decompress_kmodule_fd
>   dso__decompress_kmodule_path
>
> _fd version would remove the file and _path version would close the descriptor
>
> in any case, could you please split the change so the
> changes to decompress_kmodule are apparent?

Will do.

Thanks,
Namhyung