Hugepage COW

Adam Litke agl at
Tue Mar 22 03:26:39 EST 2005

On Wed, 2005-03-16 at 21:48, David Gibson wrote:
> As far as the consolidation patch goes, lack of testing was the main
> objective reason for holding back.  So if you could test on x86_64 and
> ia64 too, that would be great.  wli had some objections to the patch
> when I first posted which I didn't and don't really understand, and
> from conversations with akpm, I'm certainly thinking of just
> re-sending it.

I am in the process of obtaining an x86_64 box to test these on.  IA64
hardware could prove more difficult to find though.

> COW will be a bit more of a political shitfight, I suspect.  I'd like
> to at least hold off until the consolidation is merged, which makes
> the COW much easier.  We'll also need to implement the necessary
> arch-hooks for COW on every platform.  Speaking of which, did you
> implement the i386 hooks?  I thought I only did COW for ppc64, so far,
> although on top of the consolidation patch the amount of arch code is
> vastly reduced.

The version of your cow that I have has no hooks (not even for ppc64). 
I applies on top of the consolidate patch.  It is working fine on x86
but I am investigating a possible problem on ppc64.

Adam Litke - (agl at
IBM Linux Technology Center

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