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    SubjectRe: [PATCH 1/2][v2] mm: add notifier in pageblock isolation for balloon drivers
    On Fri, Oct 09, 2009 at 21:43:26 +0100, Mal Gorman wrote:
    > As you have tested this recently, would you be willing to post the
    > results? While it's not a requirement of the patch, it would be nice to have
    > an idea of how the effectiveness of memory hot-remove is improved when used
    > with the powerpc balloon. This might convince others developers for balloons
    > to register with the notifier.

    I did ten test runs without my patches and ten test runs with my patches
    on a 2.6.32-rc3 kernel.

    Without the patch:
    6 out of 10 memory-remove operations without the patch removed 1 LMB
    (64Mb), the rest of the memory-remove attempts failed to remove any LMBs.

    With the patch:
    All of the memory-remove operations removed some LMBs. The average
    removed was just over 11 LMBs (704Mb) per attempt.

    Linux was given 2Gb of memory. During the test runs the average memory in
    use was 140Mb, not including cache and buffers, and the average amount
    consumed by the balloon was 1217Mb. The system was idle while the
    memory remove operation was performed. After each attempt the system
    was rebooted and allowed ~10 minutes to settle after boot.

    With a 2Gb configuration on POWER the LMB size is 64Mb. The drmgr command
    (part of powerpc-utils) was used to remove memory by LBM, just as an
    end-user would. Below is a list of the runs and the number of LMBs
    removed.

    Stock kernel (v2.6.32-rc3)
    --------------------------
    LMBs Used kb Loaned kb
    removed
    0 135232 1257280
    0 151168 1231744
    1 152128 1234176
    1 150976 1239232
    1 151808 1232064
    0 136064 1249152
    0 137088 1246976
    1 135296 1289984
    1 136384 1263104
    1 152960 1243904
    =======================
    0.60 143910 1248762 Average
    0.49 7929 16960 StdDev

    Patched kernel
    --------------------------
    LMBs Used kb Loaned kb
    removed
    12 134336 1294336
    10 152192 1250432
    9 152832 1235520
    15 153152 1237952
    12 152320 1232704
    13 135360 1252224
    11 154176 1237056
    10 153920 1243264
    10 150720 1236416
    13 151040 1230848
    =======================
    11.50 149005 1245075 Average
    1.75 7158 17738 StdDev


    Regards,
    Robert Jennings


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