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    SubjectRe: [PATCH -V6 07/14] memcg: Add HugeTLB extension
    On Mon, Jun 11, 2012 at 2:23 AM, David Rientjes <> wrote:
    > On Mon, 11 Jun 2012, Kamezawa Hiroyuki wrote:
    >> Now, I think...
    >>   1. I need to agree that overhead is _not_ negligible.
    >>   2. THP should be the way rather than hugetlb for my main target platform.
    >>      (shmem/tmpfs should support THP. we need study.)
    >>      user-experience should be fixed by THP+tmpfs+memcg.
    >>   3. It seems Aneesh decided to have independent hugetlb cgroup.
    >> So, now, I admit to have independent hugetlb cgroup.
    >> Other opinions ?
    > I suggested the seperate controller in the review of the patchset so I
    > obviously agree with your conclusion.  I don't think we should account for
    > hugetlb pages in memory.usage_in_bytes and enforce memory.limit_in_bytes
    > since 512 4K pages is not the same as 1 2M page which may be a sacred
    > resource if fragmentation is high.
    Based on the usecase at Google, I see a definite value in including
    hugepage usage in memory.usage_in_bytes as well and having a single
    limit for memory usage for the job. Our jobs wants to specify only one
    (total) memory limit (including slab usage, and other kernel memory
    usage, hugepages, etc.).

    The hugepage/smallpage requirements of the job vary during its
    lifetime. Having two different limits means less flexibility for jobs
    as they now have to specify their limit as (max_hugepage,
    max_smallpage) instead of max(hugepage + smallpage). Two limits
    complicates the API for the users and requires them to over-specify
    the resources.

    > Many thanks to Aneesh for continuing to update the patchset and working
    > toward a resolution on this, I love the direction its taking.
    > --
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