Maybe, there should be a memory maintainer in linux kernel group.
Here, I show some content from my patch (Documentation/vm_pps.txt). In brief, I
make a revolution about Linux swap subsystem, the idea is described that
SwapDaemon should scan and reclaim pages on UserSpace::vmalist other than
current zone::active/inactive. The change will conspicuously enhance swap
subsystem performance by
1) SwapDaemon can collect the statistic of process acessing pages and by it
unmaps ptes, SMP specially benefits from it for we can use flush_tlb_range
to unmap ptes batchly rather than frequently TLB IPI interrupt per a page in
current Linux legacy swap subsystem. In fact, in some cases, we can even
flush TLB without sending IPI.
2) Page-fault can issue better readahead requests since history data shows all
related pages have conglomerating affinity. In contrast, Linux page-fault
readaheads the pages relative to the SwapSpace position of current
page-fault page.
3) It's conformable to POSIX madvise API family.
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