Re: [PATCH 5/5] mm: search from free_area_cache for the bigger size

On 02/02/2012 06:44 AM, Andrew Morton wrote:

On Fri, 13 Jan 2012 19:47:31 +0800
Xiao Guangrong [off-list ref] wrote:

quoted

If the required size is bigger than cached_hole_size, we would better search
from free_area_cache, it is more easier to get free region, specifically for
the 64 bit process whose address space is large enough

Do it just as hugetlb_get_unmapped_area_topdown() in arch/x86/mm/hugetlbpage.c

Can this cause additional fragmentation of the virtual address region? 
If so, what might be the implications of this?

Hmm, i think it is not bad since we have cached_hole_size, and, this way is also
used in other functions and architectures(arch_get_unmapped_area,
hugetlb_get_unmapped_area_bottomup, hugetlb_get_unmapped_area_topdown......).

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