Re: [RFC} memory unplug patchset prep [0/16]

[David Rientjes <rientjes@google.com>]

On Tue, 6 Mar 2007, KAMEZAWA Hiroyuki wrote:

> My purpose is to show how memory-unplug can be implemented on ZONE_MOVABLE.
> *Any* comments are welcome. This patch just support ia64, which I can test.
> If you want me to add arch support, please mail me.
> 

It's great to see progress being made in the memory hot-unplug direction.  
The implementation seems to be following the plan you had in our 
coversations from the end of last year.

> This patch is a bit old and against 2.6.20-mm2. I'll rebase this and reflect
> your comments in the next post (may not soon).
> Well booted on ia64 and passed *quick* memory offline test.
> 

When it's rebased, it might be better to apply it to the latest -mm with 
Mel Gorman's patch series merged.  They're in 2.6.21-rc2-mm2.

It appears as though you're using a subset of the ZONE_MOVABLE patches as 
posted from March 1.  What about the additional capabilities of 
ZONE_MOVABLE that aren't included in your patchset, such as allowing 
hugetlb pages from being allocated under GFP_HIGH_MOVABLE, are going to 
need to be changed to support memory hot-unplug?  Since your patchset 
wasn't based on the entire ZONE_MOVABLE set, it leads me to believe that 
some of what it does diverges with the memory hot-unplug use case.

Are you aiming to target both ia64 and x86_64 with this patchset or are 
you focusing on ia64 exclusively at the moment?

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