Re: [RFC] [PATCH] Power Managed memory base enabling

[David Rientjes <rientjes@google.com>]

On Tue, 6 Mar 2007, Mark Gross wrote:

> > Is do_migrate_pages() currently unsatisfactory for this?
> 
> This looks like it should be good for this application!  How stable is
> this?  The next phase of this work is to export the policy interfaces
> and hook up the page migration.  I'm somewhat new to the mm code.
> 

Since you've already used a NUMA approach to flagging PM-memory, you'd 
probably want to use this interface through mempolicy in your migration.  
There's currently work to do lockless VMA scanning that was posted just 
yesterday to linux-mm and that's a bottleneck in this migration.

Take a look at update_nodemask() in kernel/cpuset.c for how it migrates 
pages from a source set of nodes to a destination set using 
memory_migrate.  The cpuset specifics are explained in 
Documentation/cpusets.txt, but the basics are that you'll want to use 
memory_migrate to start the migration when you remove a node from your 
nodemask (another reason why I suggested the use of a nodemask instead of 
a simple array).

		David

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