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Message-ID: <20130913050927.GA8634@gmail.com>
Date:	Fri, 13 Sep 2013 07:09:28 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf fixes


* David Ahern <dsahern@...il.com> wrote:

> > By default a simple 'make' should build perf to the maximum extent 
> > possible, with no other input required from the user - with warnings 
> > displayed as package install suggestions.
> 
> By default there is no config. Autoprobing generates a first one or a 
> user can specify a defconfig.

This could work if there's not two but three states for individual 
features:

  - autoprobe
  - on
  - off

and if autoprobe, if a system feature has been probed successfully, 
automatically turned 'autoprobe' entries into 'on'.

That would give us the best of all worlds - autodetection, configurability 
and caching:

 - initial user types 'make' and gets a .config that has almost all
   entries 'on', a few 'autoprobe'.

 - once the user installs a dependency, the corresponding .config entry
   turns into 'on'.

 - the regular user or developers would have libraries that turn all
   entries in the .config to 'on'.

 - if a user is genuinely uninterested in a feature, he can mark it 'off', 
   which would then stay off permanently. This could also be used by
   embedded/specialized builds.

 - other specialized users, like distro builds, could use a .config with
   all entries 'on' and could enforce the presence of all dependencies for 
   a successful build. [We could add 'make allyesconfig' to help that.]

Thanks,

	Ingo
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