Re: Hot/cold allocation -- swsusp can not handle hot pages

[William Lee Irwin III]

At some point in the past, Andrew Morton wrote:
>> I'm not really sure what to suggest here.  Emptying the per-cpu
>> page pools would be tricky.  Maybe a swsusp-special page allocator
>> which goes direct to the buddy lists or something.

On Sun, Nov 03, 2002 at 09:08:09PM +0100, Pavel Machek wrote:
> Well, see the patch above. That seems to do the trick for
> me. It seems that even "cold" allocation can give page from per-cpu
> pool. I thought that was a bug?

Not a bug. The semantics only imply a preference for merging, not
a requirement to do so. A direct dequeue-from-buddy method either
by adjusting watermarks or a specialized interface in combination
with per-cpu list shootdown is required to enforce your invariants.

Bill