Re: [PATCH 0/4] Swap migration V3: Overview
[Posted October 25, 2005 by corbet]
| From: |
| Andrew Morton <akpm-AT-osdl.org> |
| To: |
| Christoph Lameter <clameter-AT-sgi.com> |
| Subject: |
| Re: [PATCH 0/4] Swap migration V3: Overview |
| Date: |
| Thu, 20 Oct 2005 16:06:38 -0700 |
| Cc: |
| kravetz-AT-us.ibm.com, linux-kernel-AT-vger.kernel.org,
linux-mm-AT-kvack.org, clameter-AT-sgi.com, magnus.damm-AT-gmail.com,
marcelo.tosatti-AT-cyclades.com |
Christoph Lameter <clameter@sgi.com> wrote:
>
> Page migration is also useful for other purposes:
>
> 1. Memory hotplug. Migrating processes off a memory node that is going
> to be disconnected.
>
> 2. Remapping of bad pages. These could be detected through soft ECC errors
> and other mechanisms.
It's only useful for these things if it works with close-to-100% reliability.
And there are are all sorts of things which will prevent that - mlock,
ongoing direct-io, hugepages, whatever.
So before we can commit ourselves to the initial parts of this path we'd
need some reassurance that the overall scheme addresses these things and
that the end result has a high probability of supporting hot unplug and
remapping sufficiently well.
