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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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