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

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Date:	Thu, 31 Jan 2008 19:34:25 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Arjan van de Ven <arjan@...radead.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, 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.
And the configuration selected is by no means optimal
with respect to minimal size.

	Sam
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