Andrew Morton wrote:

Yes, I do think that the "LRU" is a bit of a misnomer - it's very
approximate and only really suits simple workloads.  I suspect that once
things get hot and heavy the "lru" is only four-deep:
unreferenced/inactive, referenced/inactive, unreferenced/active and
referenced/active.

Can you test the patches separately, see what bits are actually helping?

OK, sorry for the delay.
http://www.kerneltrap.org/~npiggin/vm/namesys.png

The LRU patch is the one that does it.

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