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

[Hiroyuki KAMEZAWA]

Hi,

Marcelo Tosatti wrote:

> +int can_move_page(struct page *page) 
> +{
  <snip>
> +	if (page_count(page) == 0)
> +		return 1;

I think there are 3 cases when page_count(page) == 0.

1. a page is free and in the buddy allocator.
2. a page is free and in per-cpu-pages list.
3. a page is in pagevec .

I think only case 1 pages meet your requirements.

I used PG_private flag for distinguishing case 1 from 2 and 3
in my no-bitmap buddy allocator posted before.
I added PG_private flag to a page which is in buddy allocator's free_list.

Regards

-- Kame
<kamezawa.hiroyu@xxxxxxxxxxxxxx>



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