linux-kernel - Re: RFC - size tool for kernel build system

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Message-ID: <20081009152151.GB17013@cs181140183.pp.htv.fi>
Date:	Thu, 9 Oct 2008 18:21:51 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Tim Bird <tim.bird@...sony.com>
Cc:	linux-embedded <linux-embedded@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: RFC - size tool for kernel build system

On Tue, Oct 07, 2008 at 02:19:36PM -0700, Tim Bird wrote:
> I've been thinking about a tool that might be useful
> to track kernel size changes.  I'm posting this
> Request For Comments to get feedback, and determine
> if this is something that would be worthwhile to
> pursue.
> 
> What I envision is some new kernel build targets, specifically
> related to gathering size information and generating a size
> comparison report.  Some small helper scripts would be written
> to gather the necessary information, and generate the report.
>...
> Any comments?

The building blocks that would be useful are IMHO:
- a make target that generates a report for one kernel
  (like the checkstack or export_report targets)
- a script that compares two such reports and outputs the
  size differences

That's also easy to do, and if that's what's wanted I can send a patch 
that does it.

Everything else is IMHO overdesigned.

The real problem is that dumping some scripts into the kernel sources 
or publishing some data on a webpage doesn't make people use them.

Like if you run "make checkstack" on the kernel today you can see that 
drivers allocate arrays > 1 kB on the stack despite checkstack being 
available...

>  -- Tim

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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