linux-kernel - Re: [PATCH] Remove CONFIG_PM altogether, enable power management all the time

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Message-ID: <AANLkTimWnT8f=PyLgOOrZOaMx0pdv+yNtPw2T7=kO2G-@mail.gmail.com>
Date:	Tue, 8 Feb 2011 15:35:32 -0800
From:	Tim Bird <tbird20d@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Len Brown <len.brown@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-embedded@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Remove CONFIG_PM altogether, enable power management all
 the time

On Tue, Feb 8, 2011 at 4:21 AM, Ingo Molnar <mingo@...e.hu> wrote:
> Rafael, could you do a defconfig-ish x86 build with and without CONFIG_PM, and post
> the 'size vmlinux' comparison - so that we can see the size difference? We make some
> things CONFIG_EXPERT configurable just to enable folks who *really* want to cut down
> on kernel size to configure it out.

I'm one of those people who *really* wants to cut down the kernel size.
I've recently worked on a product where the kernel RAM budget is ~1M.

>
> Note that those usecases, even if they want a super-small kernel, might not care
> about PM at all while they care about size: small boot kernels in ROMs, or simple
> devices where CPU-idling implies deep low power mode, etc.
>
> So the vmlinux size comparisons would be needed really. If it's 5k nobody will care.
I care about 5K.  (But honestly, I don't actively hunt stuff less than
10K in size, because
there's too many of them to chase, currently).

 -- Tim
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