linux-kernel - Re: [PATCH v11 1/3]: perf util: map data buffer for preserving collected data

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Message-ID: <43747adb-4591-e0ff-f173-525a5f5d47b4@linux.intel.com>
Date:   Mon, 8 Oct 2018 14:55:13 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 1/3]: perf util: map data buffer for preserving
 collected data

Hi,

On 08.10.2018 13:50, Jiri Olsa wrote:
> On Mon, Oct 08, 2018 at 09:14:29AM +0300, Alexey Budankov wrote:
>>
<SNIP>
>> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
>> index f6d1a03c7523..2e90f4ce9214 100644
>> --- a/tools/perf/Makefile.config
>> +++ b/tools/perf/Makefile.config
>> @@ -355,6 +355,11 @@ endif # NO_LIBELF
>>  
>>  ifeq ($(feature-glibc), 1)
>>    CFLAGS += -DHAVE_GLIBC_SUPPORT
>> +  ifndef NO_AIO
> 
> hum, do we need NO_AIO? we have the --aio option to enable that right?

Right. Enable that *in runtime*.

> I guess BIONIC does not support aio, but but will it fail when it's
> compiled in there?

Please see updated section of the cover letter for more information 
regarding this. Possible compilation issues is that's why we better 
have this capability in advance:
  
  objdump -T tools/perf/perf | grep aio

  0000000000000000      DF *UND*	0000000000000000  GLIBC_2.2.5 aio_suspend64
  0000000000000000      DF *UND*	0000000000000000  GLIBC_2.2.5 aio_return64
  0000000000000000      DF *UND*	0000000000000000  GLIBC_2.2.5 aio_error64
  0000000000000000      DF *UND*	0000000000000000  GLIBC_2.2.5 aio_write64

IMHO, it is worth implementing NO_AIO define.

Thanks,
Alexey

> 
> jirka
> 
>> +    ifndef BIONIC
>> +        CFLAGS += -DHAVE_AIO_SUPPORT
>> +    endif
>> +  endif
>>  endif
> 
> SNIP
>