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SubjectRe: Strange interrupt behaviour
On Sun, Jul 12, 1998 at 07:10:52PM +0200, Gerard Roudier wrote:

> This has been proven to be broken, at least with the current VM/MM stuff.
> Trying hard to get 2 contiguous pages leads very often to throw away more
> that half the available cached objects, regardless the actual memory size
> being used.

One of the fundamental proporties of the buddy system is that it only
allocations PAGE_SIZE << order aligned chunks. This is unnecessary for
most allocations whith order > 0. If __get_free_pages could return
unaligned memory as well, the fragmentation issues would be far less
problematic. When doing some page colouring hacks for MIPS recently I
was pretty surprised how many continguous chunks > PAGE_SIZE are still
available when the fragmentation has already reached the point where
the machine locks up.

Ralf

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