linux-kernel - Re: [PATCH v11 3/3]: perf record: extend trace writing to multi AIO

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Date:   Mon, 8 Oct 2018 18:21:48 +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 3/3]: perf record: extend trace writing to multi AIO

Hi,

On 08.10.2018 15:45, Jiri Olsa wrote:
<SNIP>
> 
> 'perf record --aio-cblocks=N' could imply '--aio',
> 
> I'd like to have simple/intuitive way to enable that,
> without studing the meaning of the cblocks argument
> 
>   # perf record --aio ...
> 
> means that I'm storing data via async writes,
> and using some reasonable default for cblocks

Semantically, --aio is equal to --aio-cblocks=default, as you said.
So, options duplication could be avoided by having some parsing 
callback using OPT_CALLBACK().

> 
> and later on we'd add 'perf record --threads'
> allowing threads based writers ;-)

Oh, I see. Cool.

Thanks,
Alexey

> 
> jirka
>