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    SubjectRe: vmscan.c heuristic adjustment for smaller systems
    On Sat, Apr 17, 2004 at 08:53:38PM -0700, Andrew Morton wrote:
    > William Lee Irwin III <> wrote:
    > >
    > > On Sat, Apr 17, 2004 at 04:51:51PM -0700, Andrew Morton wrote:
    > > > I'd assume that setting swappiness to zero simply means that you still have
    > > > all of your libc in pagecache when running ls.
    > > > What happens if you do the big file copy, then run `sync', then do the ls?
    > > > Have you experimented with the NFS mount options? v2? UDP?
    > >
    > > I wonder if the ptep_test_and_clear_young() TLB flushing is related.
    > That, or page_referenced() always returns true on this ARM implementation
    > or some such silliness. Everything here points at the VM being unable to
    > reclaim that clean pagecache.

    How can I tell? Is it something like this: because page_referenced()
    always returns true (which I haven't investigated) then the page
    eviction code cannot distinguish mapped from cache pages and therefore
    selects valuable, mapped pages.
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