Re: [PATCH 2/5] Light Fragmentation Avoidance V20: 002_usemap

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

Mel Gorman wrote:
> On Tue, 22 Nov 2005, Andi Kleen wrote:
> 
> 
>>>All of that said, I am not even sure we have a bit left in the page
>>>flags on smaller architectures :/.
>>
>>How about
>>
>>#define PG_checked               8      /* kill me in 2.5.<early>. */
>>
>>?
>>
>>At least PG_uncached isn't used on many architectures too, so could
>>be reused. I don't know why those that use it don't check VMAs instead.
>>
> 
> 
> PG_unchecked appears to be totally unused. It's only users are the macros
> that manipulate the bit and mm/page_alloc.c . It appears it has been a
> long time since it was used to it is a canditate for reuse.
> 
Considering memory hotplug, I don't want to resize bitmaps at hot-add/remove.
no bitmap is welcome :)

-- Kame

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