Ingo wrote:
> to clearly stress the 'might easily fail' restriction. But if userspace
> is well-behaved on Andy's systems (which it seems to be), then in
> practice it should be resizable.
At first glance, this is the sticky point that jumps out at me.
Andy wrote:
> My experience is that after some days or weeks of running have gone
> by, there is no possible way short of a reboot to get pages merged
> effectively back to any pristine state with the infrastructure that
> exists there.
I take it, from what Andy writes, and from my other experience with
similar customers, that his workload is not "well-behaved" in the
sense you hoped for.
After several diverse jobs are run, we cannot, so far as I know,
merge small pages back to big pages.
I have not played with Mel Gorman's Fragmentation Avoidance patches,
so don't know if they would provide a substantial improvement here.
They well might.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <[email protected]> 1.925.600.0401
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