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    SubjectRe: [PATCH 2/6] mempolicy: Kill all mempolicy sharing
    On Wed, May 30, 2012 at 02:41:22PM -0500, Christoph Lameter wrote:
    > On Wed, 30 May 2012, kosaki.motohiro@gmail.com wrote:
    >
    > > refcount will be decreased even though was not increased whenever alloc_page_vma()
    > > is called. As you know, mere mbind(MPOL_MF_MOVE) calls alloc_page_vma().
    >
    > Most of these issues are about memory migration and shared memory. If we
    > exempt shared memory from memory migration (after all that shared memory
    > has its own distinct memory policies already!) then a lot of these issues
    > wont arise.

    Soft memory offlining needs migration. It's fairly important that this
    works: on the database systems most memory is in shared memory and they
    have a lot of memory, so predictive failure analysis and soft offlining
    helps a lot.

    Classic migration is probably not too important here, but they pretty
    much rely on the same low level mechanism.

    -Andi

    --
    ak@linux.intel.com -- Speaking for myself only.


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