Re: [PATCH] 0/2 Buddy allocator with placement policy + prezeroing

[Dave Hansen <haveblue@us.ibm.com>]

On Sun, 2005-02-27 at 13:42 +0000, Mel Gorman wrote:
> In the two following emails are the latest version of the placement policy
> for the binary buddy allocator to reduce fragmentation and the prezeroing
> patch. The changelogs are with the patches although the most significant change
> to the placement policy is a fix for a bug in the usemap size calculation
> (pointed out by Mike Kravetz). 
> 
> The placement policy is Even Better than previous versions and can allocate
> over 100 2**10 blocks of pages under loads in excess of 30 so I still
> consider it ready for inclusion to the mainline.
...

This patch does some important things for memory hotplug: it explicitly
marks the different types of kernel allocations, and it separates those
different types in the allocator.  When it comes to memory hot-remove
this is certainly something we were going to have to do anyway.  Plus, I
believe there are already at least two prototype patches that do this.  

Anything that makes future memory hotplug work easier is good in my
book. :)

-- Dave