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    SubjectRe: [PATCH 20/31] sched, numa, mm/mpol: Make mempolicy home-node aware
    On Thu, Oct 25, 2012 at 02:16:37PM +0200, Peter Zijlstra wrote:
    > Add another layer of fallback policy to make the home node concept
    > useful from a memory allocation PoV.
    >
    > This changes the mpol order to:
    >
    > - vma->vm_ops->get_policy [if applicable]
    > - vma->vm_policy [if applicable]
    > - task->mempolicy
    > - tsk_home_node() preferred [NEW]
    > - default_policy
    >
    > Note that the tsk_home_node() policy has Migrate-on-Fault enabled to
    > facilitate efficient on-demand memory migration.
    >

    Makes sense and it looks like a VMA policy, if set, will still override
    the home_node policy as you'd expect. At some point this may need to cope
    with node hot-remove. Also, at some point this must be dealing with the
    case where mbind() is called but the home_node is not in the nodemask.
    Does that happen somewhere else in the series? (maybe I'll see it later)

    --
    Mel Gorman
    SUSE Labs


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