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    SubjectRe: [PATCH] badness() dramatically overcounts memory
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    On Tue, 2008-02-05 at 09:43 +0530, Balbir Singh wrote:
    > 1. grep on the kernel source tells me that shared_vm is incremented only in
    > vm_stat_account(), which is a NO-OP if CONFIG_PROC_FS is not defined.

    I see, thanks for pointing that out. Is there another way do you think?
    Would the penalty be to high to enable vm_stat_account when
    CONFIG_PROC_FS is not defined?

    Or perhaps my patch would only have an effect when CONFIG_PROC_FS is set
    (which is default)?

    > 2. How have you tested these patches? One way to do it would be to use the
    > memory controller and set a small limit on the control group. A memory
    > intensive application will soon see an OOM.

    I have done a quick test a while back when I first wrote the patch. I
    will test more thoroughly now.

    > The interesting thing is the use of total_vm and not the RSS which is used as
    > the basis by the OOM killer. I need to read/understand the code a bit more.

    RSS makes more sense to me as well.

    To me, it makes no sense to count shared memory, because killing a
    process doesn't free the shared memory.

    Regards,
    Jeff Davis



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