Re: [PATCH 09/11] unpaged: ZERO_PAGE in VM_UNPAGED

From: Ingo Oeser
Date: Thu Nov 17 2005 - 16:25:16 EST

Hi Hugh,

On Thursday 17 November 2005 20:38, Hugh Dickins wrote:
> It's strange enough to be looking out for anonymous pages in VM_UNPAGED
> areas, let's not insert the ZERO_PAGE there - though whether it would
> matter will depend on what we decide about ZERO_PAGE refcounting.

We do we refcount ZERO_PAGE at all?
Ok, there may be multiple, but they exist always and always at
the same physical addresses, right?

So why do we care at all?
Memory hotplug?
Doesn't it suffice there, that they are reverse mappable?

Aren't they a perfect candidate for a VM_UNPAGED from /dev/zero :-)


Ingo Oeser

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