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

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Message-ID: <20181008123724.GC18757@krava>
Date:   Mon, 8 Oct 2018 14:37:24 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.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

On Mon, Oct 08, 2018 at 02:55:13PM +0300, Alexey Budankov wrote:
> 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.

ok, if there are c libs that won't compile with that,
then sure, we need it

thanks,
jirka