linux-kernel - Re: [PATCH] kill hotplug init/exit section annotations

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Date:	Thu, 31 Jan 2008 10:48:11 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Adrian Bunk <bunk@...nel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	davem@...emloft.net, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH] kill hotplug init/exit section annotations

On Thu, 31 Jan 2008 19:34:25 +0100
Sam Ravnborg <sam@...nborg.org> wrote:

> On Thu, Jan 31, 2008 at 09:48:01AM -0800, Arjan van de Ven wrote:
> > On Thu, 31 Jan 2008 19:14:36 +0200
> > Adrian Bunk <bunk@...nel.org> wrote:
> > > > cpuhotplug is required for suspend/resume.
> > > 
> > > Not on UP computers.
> > > 
> > 
> > great! someone who still has one of those and uses a kernel without
> > it. Can you look at your system.map and see how many kilobytes
> > you've gained? Eg how many kilobytes are in these sections exactly?
> I have one. A Atmel AT91 board equipped with an 9263.
> So lets take a look at the defconfig build for the evaluation board.
> 
> 
> o-arm/vmlinux.o:     file format elf32-littlearm
> 
>   0 .text         001cdefc  00000000  00000000  00000400  2**10
>   2 .init.text    000165e8  00000000  00000000  001ce6c0  2**5
>  26 .init.data    000032ec  00000000  00000000  002578cc  2**2
> 
> ---
> 
>   4 .devinit.text 00001558  00000000  00000000  001e5270  2**2
>   9 .exit.text    00000bc8  00000000  00000000  001e8d2c  2**2
>  10 .cpuinit.text 00000924  00000000  00000000  001e98f4  2**2
>  11 .meminit.text 000004cc  00000000  00000000  001ea218  2**2
>  12 .devexit.text 00000160  00000000  00000000  001ea6e4  2**2
>  38 .cpuinit.data 00000040  00000000  00000000  0025afc0  2**2
>  39 .meminit.data 0000000c  00000000  00000000  0025b000  2**2
> 
> 
> __devinit alone gives a net win of 5464 bytes.
> That is only ~3% of total .text size but this is non-swapable
> memory where everything is worth it.

now how much of this is lost again because you have to round the stuff to pagesize?
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