linux-kernel - Re: [PATCH 2/7] mm: introduce vma flag VM_ARCH

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Date:	Sun, 01 Apr 2012 08:25:14 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2/7] mm: introduce vma flag VM_ARCH_1

On Sat, 2012-03-31 at 13:29 +0400, Konstantin Khlebnikov wrote:
> This patch shuffles some bits in vma->vm_flags
> 
> before patch:
> 
>         0x00000200      0x01000000      0x20000000      0x40000000
> x86     VM_NOHUGEPAGE   VM_HUGEPAGE     -               VM_PAT
> powerpc -               -               VM_SAO          -
> parisc  VM_GROWSUP      -               -               -
> ia64    VM_GROWSUP      -               -               -
> nommu   -               VM_MAPPED_COPY  -               -
> others  -               -               -               -
> 
> after patch:
> 
>         0x00000200      0x01000000      0x20000000      0x40000000
> x86     -               VM_PAT          VM_HUGEPAGE     VM_NOHUGEPAGE
> powerpc -               VM_SAO          -               -
> parisc  -               VM_GROWSUP      -               -
> ia64    -               VM_GROWSUP      -               -
> nommu   -               VM_MAPPED_COPY  -               -
> others  -               VM_ARCH_1       -               -
> 
> And voila! One completely free bit.

Great :-) Let me know when you free VM_ARCH_2 as well as I have good use
for it too :-)

Cheers,
Ben.


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