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

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Message-ID: <20080322071755.GP2346@one.firstfloor.org>
Date:	Sat, 22 Mar 2008 08:17:55 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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 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
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