linux-kernel - Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables

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Date:	Sat, 22 Mar 2008 00:24:55 -0700
From:	Nicholas Miell <nmiell@...cast.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ulrich Drepper <drepper@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables


On Sat, 2008-03-22 at 08:17 +0100, Andi Kleen wrote:
> On Fri, Mar 21, 2008 at 09:36:51PM -0700, Ulrich Drepper wrote:
> > On Fri, Mar 21, 2008 at 10:26 AM, Andi Kleen <andi@...stfloor.org> wrote:
> > >  Concrete suggestions please.
> > 
> > I already spelled it out.  Add a new program header entry, point it to
> > a bit array large enough to cover all loadable segments.
> 
> Ah that's easy, the program header is already supported in the kernel code
> (PT_PRESENT_BITMAP)
> 
> The additional SHDR is just there for easier testing/migration.
> > 
> > It is not worth creating problems with this invalid extension just for
> 
> You still didn't say why it was invalid.
> 
> Anyways I disagree on the value of supporting old binaries. I believe
> it is important.
> 
> -Andi

Why not stick the bitmap in an xattr?

-- 
Nicholas Miell <nmiell@...cast.net>

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