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    SubjectRe: [PATCH -V2 0/9] memcg: add HugeTLB resource tracking
    On Sun, Mar 04, 2012 at 11:39:23PM +0530, Aneesh Kumar K.V wrote:
    > On Fri, 2 Mar 2012 14:28:53 +1100, David Gibson <dwg@au1.ibm.com> wrote:
    > > On Thu, Mar 01, 2012 at 02:40:29PM -0800, Andrew Morton wrote:
    > > > On Thu, 1 Mar 2012 14:46:11 +0530
    > > > "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> wrote:
    > > >
    > > > > This patchset implements a memory controller extension to control
    > > > > HugeTLB allocations. It is similar to the existing hugetlb quota
    > > > > support in that, the limit is enforced at mmap(2) time and not at
    > > > > fault time. HugeTLB's quota mechanism limits the number of huge pages
    > > > > that can allocated per superblock.
    > > > >
    > > > > For shared mappings we track the regions mapped by a task along with the
    > > > > memcg. We keep the memory controller charged even after the task
    > > > > that did mmap(2) exits. Uncharge happens during truncate. For Private
    > > > > mappings we charge and uncharge from the current task cgroup.
    > > >
    > > > I haven't begin to get my head around this yet, but I'd like to draw
    > > > your attention to https://lkml.org/lkml/2012/2/15/548. That fix has
    > > > been hanging around for a while, but I haven't done anything with it
    > > > yet because I don't like its additional blurring of the separation
    > > > between hugetlb core code and hugetlbfs. I want to find time to sit
    > > > down and see if the fix can be better architected but haven't got
    > > > around to that yet.
    > >
    > > So.. that version of the fix I specifically rebuilt to address your
    > > concerns about that blurring - in fact I think it reduces the current
    > > layer blurring. I haven't had any reply - what problems do see it as
    > > still having?
    >
    > https://lkml.org/lkml/2012/2/16/179 ?

    Ah. Missed that reply somehow. Odd. Replied now and I'll respin
    accordingly.

    > That is a serious issue isn't it ?

    Yes, it is. And it's been around for a long, long time.

    --
    David Gibson | I'll have my music baroque, and my code
    david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
    | _way_ _around_!
    http://www.ozlabs.org/~dgibson



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