On Wednesday 16 November 2005 02:43, Mel Gorman wrote:
> 1. I was using a page flag, valuable commodity, thought I would get kicked
> for it. Usemap uses 1 bit per 2^(MAX_ORDER-1) pages. Page flags uses
> 2^(MAX_ORDER-1) bits at worse case.
Why does it need multiple bits? A page can only be in one order at a
time, can't it?
> 2. Fragmentation avoidance tended to break down, very fast.
Why? The algorithm should the same, no?
> 3. When changing a block of pages from one type to another, there was no
> fast way to make sure all pages currently allocation would end up on
> the correct free list
If you can change the bitmap you can change as well mem_map
-Andi
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