Hi

I think this patch is very good improvement.
but it is not related to split lru.

Why don't you separate this patch?
IMHO treat as independent patch is better.

Thanks.

During an AIM7 run on a 16GB system, fork started failing around
32000 threads, despite the system having plenty of free swap and
15GB of pageable memory.

If normal pageout does not result in contiguous free pages for
kernel stacks, fall back to lumpy reclaim instead of failing fork
or doing excessive pageout IO.

I do not know whether this change is needed due to the extreme
stress test or because the inactive list is a smaller fraction
of system memory on huge systems.

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