From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Yasunori Goto <y-goto@jp.fujitsu.com>,
Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5 of 6] hotplug-memory: add section_ops
Date: Fri, 04 Apr 2008 13:38:19 -0700 [thread overview]
Message-ID: <47F691BB.3080302@goop.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0804041226080.3936@schroedinger.engr.sgi.com>
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
next prev parent reply other threads:[~2008-04-04 20:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-04 0:05 [PATCH 0 of 6] [RFC] another attempt at making hotplug memory and xen play together Jeremy Fitzhardinge
2008-04-04 0:05 ` [PATCH 1 of 6] hotplug-memory: refactor online_pages to separate zone growth from page onlining Jeremy Fitzhardinge
2008-04-04 1:06 ` Dave Hansen
2008-04-04 1:20 ` Jeremy Fitzhardinge
2008-04-04 1:33 ` Dave Hansen
2008-04-04 1:09 ` Dave Hansen
2008-04-04 1:32 ` Jeremy Fitzhardinge
2008-04-04 1:41 ` Dave Hansen
2008-04-04 1:56 ` Yasunori Goto
2008-04-04 5:34 ` Jeremy Fitzhardinge
2008-04-04 0:05 ` [PATCH 2 of 6] xen: make phys_to_machine structure dynamic Jeremy Fitzhardinge
2008-04-04 0:05 ` [PATCH 3 of 6] xen-balloon: use memory hot-add to expand the domain's memory Jeremy Fitzhardinge
2008-04-04 0:05 ` [PATCH 4 of 6] hotplug-memory: use common online_page Jeremy Fitzhardinge
2008-04-04 0:47 ` Dave Hansen
2008-04-04 0:56 ` Jeremy Fitzhardinge
2008-04-04 1:00 ` Dave Hansen
2008-04-04 1:11 ` Jeremy Fitzhardinge
2008-04-04 1:22 ` Dave Hansen
2008-04-04 0:05 ` [PATCH 5 of 6] hotplug-memory: add section_ops Jeremy Fitzhardinge
2008-04-04 0:51 ` Dave Hansen
2008-04-04 1:12 ` Jeremy Fitzhardinge
2008-04-04 1:52 ` Dave Hansen
2008-04-04 5:32 ` Jeremy Fitzhardinge
2008-04-04 14:22 ` Dave Hansen
2008-04-04 18:21 ` Jeremy Fitzhardinge
2008-04-04 19:28 ` Christoph Lameter
2008-04-04 20:38 ` Jeremy Fitzhardinge [this message]
2008-04-04 1:47 ` KAMEZAWA Hiroyuki
2008-04-04 5:35 ` Jeremy Fitzhardinge
2008-04-04 0:05 ` [PATCH 6 of 6] xen-balloon: define a section_ops Jeremy Fitzhardinge
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