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Re: [PATCH 0/4] Swap migration V3: Overview

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
Archive-link:  Article, Thread

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.


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