linux-kernel - Re: [PATCH 1/9] perf python: add ui stubs file

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Date:	Wed, 31 Oct 2012 16:18:16 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org,
	mingo@...nel.org, peterz@...radead.org, fweisbec@...il.com
Subject: Re: [PATCH 1/9] perf python: add ui stubs file

On Tue, 30 Oct 2012 08:53:38 -0700, Arnaldo Carvalho de Melo wrote:
> Em Tue, Oct 30, 2012 at 08:45:28AM -0600, David Ahern escreveu:
>> On 10/30/12 1:24 AM, Namhyung Kim wrote:
>> >On Mon, 29 Oct 2012 10:31:41 -0600, David Ahern wrote:
>> >>stdio based implementations of ui_xxxx based functions for the python
>> >>library. Needed for patch 3 - consolidating open counters method.
>
>> >How about adding ui/util.c to the python-ext-sources?
>
>> Handles some of the ui_xxxx functions, but still missing some
>> symbols -- verbose, eprintf, ui__error_paranoid. The point of the
>> python_stubs.c was a short term solution for the ui handlers.
>> Arnaldo had some ideas on what is really needed.
>
> Yes, and that is something like what Namhyung did for perf_target, i.e.
> don't call ui__ stuff from the evsel/evlist classes but use a
> perf_evlist__strerror, merge perf_evlist__open_counters() with
> perf_evlist__open(), use just perf_evlist__open() everywhere, so that
> all tools get the fallbacks for features not present in older kernels,
> etc.

Yeah, it'd be better definitely.  But the problem is we might emit
warnings even in the internal fallback loop.  Not sure how to handle it
with this approach.

Thanks,
Namhyung
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