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    SubjectRe: [RFC][PATCH 25/26] sched, numa: Only migrate long-running entities
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    On Mon, 2012-07-09 at 10:53 -0400, Rik van Riel wrote:
    > On 07/09/2012 08:26 AM, Peter Zijlstra wrote:
    > > On Sun, 2012-07-08 at 14:34 -0400, Rik van Riel wrote:
    >
    > >> Do we really want to calculate the amount of CPU time used
    > >> by a process, and start migrating after just one second?
    > >>
    > >> Or would it be ok to start migrating once a process has
    > >> been scanned once or twice by the NUMA code?
    > >
    > > You mean, the 2-3rd time we try and migrate this task, not the memory
    > > scanning thing as per Andrea, right?
    >
    > Indeed. That way we can simply keep a flag somewhere,
    > instead of iterating over the threads in a process.

    Note that the code in -tip needs to iterate over all tasks in order to
    test all cpus_allowed and mems_allowed masks. But we could keep a
    process wide intersection of those masks around as well I guess,
    updating them is a slow path anyway.


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