linux-kernel - Re: [GIT PULL 0/9] perf/core improvements and fixes

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Date:	Sat, 27 Oct 2012 15:19:35 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Andrew Vagin <avagin@...nvz.org>,
	Borislav Petkov <bp@...64.org>,
	David Howells <dhowells@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [GIT PULL 0/9] perf/core improvements and fixes


* Arnaldo Carvalho de Melo <acme@...radead.org> wrote:

> Em Fri, Oct 26, 2012 at 04:54:51PM +0200, Ingo Molnar escreveu:
> > * Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
> > > . Makefile improvements from Namhyung Kim.
> > 
> > These are really useful: there used to be a couple of 
> > seconds of wait time at the beginning of every perf build - 
> > these are now nicely explained with the various CHK entries.
> 
> The optimal way, I guess, would be to have some cache file 
> with the results of such feature tests, that would be created 
> and then used till the build fails using its findings, which 
> would trigger a new feature check round, followed by an 
> automatic rebuild.
> 
> That would be tricky because we would have to have an 
> automated way of discovering if the build failed due to 
> missing packages or if it failed due to some ordinary coding 
> mistake.

The feature tests aren't a big problem right now - but making it 
*visible* is really useful. It also tells us which feature test 
fails, etc.

Thanks,

	Ingo
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