Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19

Martin J. Bligh
2005-11-02T14:51:52Z

> Well I think it can satisfy hugepage allocations simply because
> we can be reasonably sure of being able to free contiguous regions.
> Of course it will be memory no longer easily reclaimable, same as
> the case for the frag patches. Nor would be name ZONE_REMOVABLE any
> longer be the most appropriate!
>
> But my point is, the basic mechanism is there and is workable.
> Hugepages and memory unplug are the two main reasons for IBM to be
> pushing this AFAIKS.

No, that's not true - those are just the "exciting" features that go
on the back of it. Look back in this email thread - there's lots of
other reasons to fix fragmentation. I don't believe you can eliminate
all the order > 0 allocations in the kernel.