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

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Message-Id: <201102091807.03094.rjw@sisk.pl>
Date:	Wed, 9 Feb 2011 18:07:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Frank Rowand <frank.rowand@...sony.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 Wednesday, February 09, 2011, Mark Brown wrote:
> On Tue, Feb 08, 2011 at 03:35:29PM -0800, Frank Rowand wrote:
> 
> > For 2.6.38-rc4, x86_64, CONFIG_NR_CPUS=4:
> 
> > size vmlinux
> >    text     data       bss       dec      hex  filename
> > 
> > 6553910  3555020   9994240  20103170  132c002  vmlinux    with    CONFIG_PM
> > 6512652  3553116   9994240  20060008  1321768  vmlinux    without CONFIG_PM
> > 
> >   41258     1904         0     43162                      delta
> 
> > That is big enough for me to care.
> 
> Hrm, that's pretty surprising.  It'd be interesting to know how much of
> that is due to the PM core itself and how much of that is from drivers.
> For the drivers CONFIG_PM isn't really the option they should be using
> in the first place - they mostly want some combination of PM_SLEEP and
> PM_RUNTIME for the specific functionality.  I'm running some checks now.
> 
> >  > CONFIG_PM_SLEEP=y
> 
> Raphael's patch will make this a user visible option in place of raw
> CONFIG_PM by default so you'd be able to turn that off.

No, it won't (just to clarify).

Thanks,
Rafael
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