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    SubjectRe: What can we do to get ready for memory controller merge in 2.6.25
    Nick Piggin wrote:
    > On Friday 30 November 2007 01:43, Balbir Singh wrote:
    >> They say better strike when the iron is hot.
    >>
    >> Since we have so many people discussing the memory controller, I would
    >> like to access the readiness of the memory controller for mainline
    >> merge. Given that we have some time until the merge window, I'd like to
    >> set aside some time (from my other work items) to work on the memory
    >> controller, fix review comments and defects.
    >>
    >> In the past, we've received several useful comments from Rik Van Riel,
    >> Lee Schermerhorn, Peter Zijlstra, Hugh Dickins, Nick Piggin, Paul Menage
    >> and code contributions and bug fixes from Hugh Dickins, Pavel Emelianov,
    >> Lee Schermerhorn, YAMAMOTO-San, Andrew Morton and KAMEZAWA-San. I
    >> apologize if I missed out any other names or contributions
    >>
    >> At the VM-Summit we decided to try the current double LRU approach for
    >> memory control. At this juncture in the space-time continuum, I seek
    >> your support, feedback, comments and help to move the memory controller
    >
    > Do you have any test cases, performance numbers, etc.? And also some
    > results or even anecdotes of where this is going to be used would be
    > interesting...
    >

    Some test results were posted at

    http://lkml.org/lkml/2007/8/17/69
    http://lkml.org/lkml/2007/8/19/36
    http://lwn.net/Articles/242554/

    Some results for the RSS controller can be found in the OLS paper

    https://ols2006.108.redhat.com/2007/Reprints/singh-Reprint.pdf

    and at

    http://lkml.org/lkml/2007/5/18/1

    As far as test cases are concerned, I have a simple test case that I use
    that allocates memory and touches all the allocated memory in a loop. I
    can post that out if required. It uses various types of allocation

    1. mmaped memory
    2. anonymous memory
    3. shared memory

    I also run various benchmarks inside a control group, limited to 400 MB
    of RAM.

    One interesting that I noticed was that when I booted with mem=<some
    memory> and created a container with the same <some value>. The swapout
    test case ran much faster in the container (NOTE: This was prior to the
    swap cache changes).

    KAMEZAWA-San posted some test results on background reclaim and per zone
    reclaim

    http://forum.openvz.org/index.php?t=tree&th=4696&mid=23964&&rev=&reveal=

    The simplest use cases that come to mind are

    1. Memory control for containers/virtualization
    2. Job Isolation


    --
    Warm Regards,
    Balbir Singh
    Linux Technology Center
    IBM, ISTL
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