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    SubjectRe: Minutes from Feb 21 LSE Call
    From
    Date
    Hanna Linder <hannal@us.ibm.com> writes:

    > LSE Con Call Minutes from Feb21
    >
    > Minutes compiled by Hanna Linder hannal@us.ibm.com, please post
    > corrections to lse-tech@lists.sf.net.
    >
    > Object Based Reverse Mapping:
    > (Dave McCracken, Ben LaHaise, Rik van Riel, Martin Bligh, Gerrit Huizenga)
    >

    > Ben said none of the users have been complaining about
    > performance with the existing rmap. Martin disagreed and said Linus,
    > Andrew Morton and himself have all agreed there is a problem.
    > One of the problems Martin is already hitting on high cpu machines with
    > large memory is the space consumption by all the pte-chains filling up
    > memory and killing the machine. There is also a performance impact of
    > maintaining the chains.

    Note: rmap chains can be restricted to an arbitrary length, or an
    arbitrary total count trivially. All you have to do is allow a fixed
    limit on the number of people who can map a page simultaneously.

    The selection of which chain to unmap can be a bit tricky but is
    relatively straight forward. Why doesn't someone who is seeing
    this just hack this up?


    Eric
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