Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933001AbYAaSeg (ORCPT ); Thu, 31 Jan 2008 13:34:36 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763526AbYAaSe1 (ORCPT ); Thu, 31 Jan 2008 13:34:27 -0500 Received: from pasmtpb.tele.dk ([80.160.77.98]:50131 "EHLO pasmtpB.tele.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758606AbYAaSeZ (ORCPT ); Thu, 31 Jan 2008 13:34:25 -0500 Date: Thu, 31 Jan 2008 19:34:25 +0100 From: Sam Ravnborg To: Arjan van de Ven Cc: Adrian Bunk , James Bottomley , davem@davemloft.net, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, "Maciej W. Rozycki" Subject: Re: [PATCH] kill hotplug init/exit section annotations Message-ID: <20080131183425.GA2893@uranus.ravnborg.org> References: <20080130212011.GA26621@uranus.ravnborg.org> <1201729295.3292.94.camel@localhost.localdomain> <20080130223219.GT29368@does.not.exist> <20080131074436.GA31966@uranus.ravnborg.org> <1201795051.3131.13.camel@localhost.localdomain> <20080131081120.27505dc0@laptopd505.fenrus.org> <20080131162141.GC19700@cs181133002.pp.htv.fi> <20080131090749.72781689@laptopd505.fenrus.org> <20080131171436.GG19700@cs181133002.pp.htv.fi> <20080131094801.63a048f0@laptopd505.fenrus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080131094801.63a048f0@laptopd505.fenrus.org> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1729 Lines: 44 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 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/