linux-kernel - Re: "build-id" changes break sparc64

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Message-ID: <20070723185648.GK21668@ftp.linux.org.uk>
Date:	Mon, 23 Jul 2007 19:56:48 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Alan Modra <amodra@...pond.net.au>,
	Roland McGrath <roland@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	David Miller <davem@...emloft.net>,
	Adrian Bunk <bunk@...sta.de>, linux-kernel@...r.kernel.org
Subject: Re: "build-id" changes break sparc64

On Mon, Jul 23, 2007 at 08:00:48PM +0200, Sam Ravnborg wrote:
> On Mon, Jul 23, 2007 at 12:49:36PM +0100, Al Viro wrote:
> > On Mon, Jul 23, 2007 at 06:55:59PM +0930, Alan Modra wrote:
> > > On Mon, Jul 23, 2007 at 10:14:35AM +0200, Sam Ravnborg wrote:
> > > > But I would still like to hear from Alan what the benefits are.
> > > 
> > > See http://sourceware.org/ml/binutils/2004-10/msg00178.html
> > 
> > What does _not_ doing intermediates do to memory footprint of ld(1)
> > and time spent in there?
> 
> x86_64 defconfig
> 
> rm vmlinux*; time make vmlinux
> 
> Vanilla tree: ~7,7 sec
> With single shot ld (Roland's patch): 8,3 secs
> 
> So as expected slower. As we link twice the cost is ~0,3 sec 
> for a x86_64 defconfig link on my box.

defconfig is not too interesting, but anyway - how much memory does it
take in process?  And, obviously, what kind of box it is?

> So it should be beneficial to do it and Alan's link did not really
> convince me for the kernel usage.
> Al - do you have any input there?

Depends.  If more-or-less allmodconfig doesn't kick everything else out
of cache and doesn't end up creating fsckloads of seeks...

Actually, if you want a killer, see what happens when building with debug
info...
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