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    SubjectRe: [VM PATCH 2.6.8-rc1] Prevent excessive scanning of lower zone
    Shantanu Goel wrote:
    > Hi Andrew,
    >
    > --- Andrew Morton <akpm@osdl.org> wrote:
    >
    >
    >>Shantanu Goel <sgoel01@yahoo.com> wrote:
    >>
    >>>I emailed this a few weeks back to the list but it
    >>>seems to have gotten lost...
    >>
    >>It came through. I was unable to reproduce the
    >>disproportional scanning
    >>rate on almost exactly the same setup, so I parked
    >>the problem for a while.
    >>
    >>I do agree with the analysis though. The problem
    >>_could_ occur. I dunno
    >>why it happens for you and not for me...
    >>
    >
    >
    > Actually, the analysis turned out to be not entirely
    > correct. I think I have identified the offending
    > code. Please see attached patch. It makes kswapd()
    > skip zones which contain greater than "pages_high"
    > pages.
    >

    You'd think so, but that isn't quite right. That blows
    the incremental min thing in the page allocator.

    I'm just about to send out a couple of patches for
    comment on linux-mm, one of which should fix your problem.
    I'll cc you on it.
    -
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