linux-kernel - Re: [PATCH 5 of 6] hotplug-memory: add section

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Message-ID: <47F691BB.3080302@goop.org>
Date:	Fri, 04 Apr 2008 13:38:19 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Christoph Lameter <clameter@....com>
CC:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5 of 6] hotplug-memory: add section_ops

Christoph Lameter wrote:
> Note that you could use 4k page size chunks for the memmap if its 
> virtualized (CONFIG_SPARSEMEM_VMEMMAP). Instead of a single PMD 
> pointing to a 2MB block you would have the PMD point to a block of
> ptes that would in turn point to the discontiguous series of 4k pages.
>
> The memory is virtually contiguous so all the logic stays the same. What 
> would be needed is some enhancements to the way the memmap is populated.

In Xen I think that would be accommodated by the existing 
pseudo-physical to machine mapping.  We don't support PSE anyway, so all 
the pages would be individual 4k pages; the fact that they're 
machine-discontigious is hidden because of the pseudo-phys to machine 
mapping when ptes are constructed.

    J
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