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    SubjectRe: tracking memory usage/leak in "inactive" field in /proc/meminfo?
    On 02/09/2010 06:32 PM, KOSAKI Motohiro wrote:

    > can you please post your /proc/meminfo?

    On 02/09/2010 09:50 PM, Balbir Singh wrote:
    > Do you have swap enabled? Can you help with the OOM killed dmesg log?
    > Does the situation get better after OOM killing.

    On 02/09/2010 10:09 PM, KOSAKI Motohiro wrote:

    > Chris, 2.6.27 is a bit old. plese test it on latest kernel. and please
    don't use
    > any proprietary drivers.

    Thanks for the replies.

    Swap is enabled in the kernel, but there is no swap configured. ipcs
    shows little consumption there.

    The test load relies on a number of kernel modifications, making it
    difficult to use newer kernels. (This is an embedded system.) There are
    no closed-source drivers loaded, though there are some that are not in
    vanilla kernels. I haven't yet tried to reproduce the problem with a
    minimal load--I've been more focused on trying to understand what's
    going on in the code first. It's on my list to try though.

    Here are some /proc/meminfo outputs from a test run where we
    artificially chewed most of the free memory to try and force the oom
    killer to fire sooner (otherwise it takes days for the problem to trigger).

    It's spaced with tabs so I'm not sure if it'll stay aligned. The first
    row is the sample number. All the HugePages entries were 0. The
    DirectMap entries were constant. SwapTotal/SwapFree/SwapCached were 0,
    as were Writeback/NFS_Unstable/Bounce/WritebackTmp.

    Samples were taken 10 minutes apart. Between samples 49 and 50 the
    oom-killer fired.

    13 49 50
    MemTotal 4042848 4042848 4042848
    MemFree 113512 52668 69536
    Buffers 20 24 76
    Cached 1285588 1287456 1295128
    Active 2883224 3369440 2850172
    Inactive 913756 487944 990152
    Dirty 36 216 252
    AnonPages 2274756 2305448 2279216
    Mapped 10804 12772 15760
    Slab 62324 62568 63608
    SReclaimable 24092 23912 24848
    SUnreclaim 38232 38656 38760
    PageTables 11960 12144 11848
    CommitLimit 2021424 2021424 2021424
    Committed_AS 12666508 12745200 7700484
    VmallocUsed 23256 23256 23256

    It's hard to get a good picture from just a few samples, so I've
    attached an ooffice spreadsheet showing three separate runs. The
    samples above are from sheet 3 in the document.

    In those spreadsheets I notice that
    memfree+active+inactive+slab+pagetables is basically a constant.
    However, if I don't use active+inactive then I can't make the numbers
    add up. And the difference between active+inactive and
    buffers+cached+anonpages+dirty+mapped+pagetables+vmallocused grows
    almost monotonically.


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