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

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Message-ID: <cc781e40-c162-9581-9573-d994785c4cc1@linux.intel.com>
Date:   Mon, 8 Oct 2018 17:43:38 +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 15:38, Jiri Olsa wrote:
> On Mon, Oct 08, 2018 at 03:03:18PM +0300, Alexey Budankov wrote:
<SNIP>
>>
>> Well, let's go with stub functions design as opposite to pure 
>> conditional compilation. However this may, probably, result in 
>> unintended Perf tool binary size growth, even if NO_AIO is 
>> defined during compilation.
> 
> hum, empty functions are be optimized out

Yes, but there will be references to stubs in else branch of 
record__mmap_read_evlist() so I am not sure that *all* compilers 
are smart enough to recognize and still optimize it out.

Thanks,
Alexey

> 
> jirka
>