Re: [RFC] Removing page->flags

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Magnus Damm wrote:
> With my proposal (Removing type B bits), if you can guarantee that all
> your zones have a start address and a size that is aligned to (1 <<
> (PAGE_SHIFT * 2)), then the following code should be possible:
> 
> struct zone *page_zone(struct page *page)
> {
>   struct page *parent = virt_to_page(page);
> 
>   return (struct zone *)parent->mapping;
> }
> 

I think "Why do this" is important. Just for increasing space of page->flags
is not attractive to me. And I think your proposal will adds a extra limitation
to memmap and page<->zone linkage.
IMHO, it will adds another complexity to the kernel.

-- Kame


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