linux-kernel - Re: [PATCHv3 1/3] x86: use ELF format in compressed images.

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Message-ID: <86802c440804061034y1f54dc2bhd861f8c6e9e6edbe@mail.gmail.com>
Date:	Sun, 6 Apr 2008 10:34:30 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Ian Campbell" <ijc@...lion.org.uk>, "Ingo Molnar" <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCHv3 1/3] x86: use ELF format in compressed images.

On Sun, Apr 6, 2008 at 10:25 AM, H. Peter Anvin <hpa@...or.com> wrote:
>
> Yinghai Lu wrote:
>
> > On Sun, Apr 6, 2008 at 9:38 AM, H. Peter Anvin <hpa@...or.com> wrote:
> >
> > > Yinghai Lu wrote:
> > >
> > >
> > > > so will cost every bzImage extra memory copy? that could be 18M or
> > > > even more big.
> > > >
> > > >
> > >  I wouldn't worry about that.  You will typically have several copies of
> the
> > > images during the execution of the boot loader.
> > >
> >
> > i put all drivers needed in kernel.
> > 1. bootloader copy bzImage (6M) to memory
> > 2. arch/x86/boot/compressed/head_32.S, will copy bzImage to end of
> > buffer to do uncompress on possiton.
> > 3. parse_elf will copy the vmlinux (the uncompressed, that is some big,
> 18M)
> >
> > I suggest that could have special elf header, and will only have one
> > PT_LOAD, and avoid the copy, and just offset start address of
> > uncompressed kernel for jump later.
> >
>
>  Once again, I think you will have a hard time measuring the time
> difference.

ok.

forget about my proposal..

YH
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