Re: [RFC] memory defragmentation to satisfy high order allocations

[Andrew Morton]

Marcelo Tosatti <marcelo.tosatti@xxxxxxxxxxxx> wrote:
>
> The following patch implements a "coalesce_memory()" function 
> which takes "zone" and "order" as a parameter. 
> 
> It tries to move enough physically nearby pages to form a free area
> of "order" size.
> 
> It does that by checking whether the page can be moved, allocating a new page, 
> unmapping the pte's to it, copying data to new page, remapping the ptes, 
> and reinserting the page on the radix/LRU.

Presumably this duplicates some of the memory hot-remove patches.

Apparently Dave Hansen has working and sane-looking hot remove code
which is in a close-to-submittable state.
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