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    SubjectRe: [PATCH V3 0/22] sched: simplified fork, enable load average into LB and power awareness scheduling
    Hi Alex,

    On Sat, Jan 05, 2013 at 08:37:29AM +0000, Alex Shi wrote:
    > The patch set base on Linus tree, includes 3 parts,
    > 1, bug fix and fork/wake balancing clean up. patch 1~6,
    > the first patch remove one domain level. patch 2~6 simplified fork/wake
    > balancing, it can increase 10+% hackbench performance on our 4 sockets
    > SNB EP machine.
    >
    > V3 change:
    > a, added the first patch to remove one domain level on x86 platform.
    > b, some small changes according to Namhyung Kim's comments, thanks!
    >
    > 2, bug fix for load average and implement it into LB, patch 7~12,
    > That using load average in load balancing, with a initial runnable load
    > value bug fix.
    >
    > V3 change:
    > a, use rq->cfs.runnable_load_avg as cpu load not
    > rq->avg.load_avg_contrib, since the latter need much time to accumulate
    > for new forked task,
    > b, a build issue fixed with Namhyung Kim's reminder.
    >
    > 3, power awareness scheduling, patch 13~22,
    > The subset implement my previous power aware scheduling proposal:
    > https://lkml.org/lkml/2012/8/13/139
    > It defines 2 new power aware policy balance and powersaving, and then
    > try to spread or pack tasks on each of sched group level according the
    > different scheduler policy. That can save much power when task number in
    > system is no more then LCPU number.

    Interesting stuff. I have read through your patches, but it is still not
    clear to me what metrics you use to determine whether a sched group is
    fully utilized or if it can be used for packing more tasks. Is it based on
    nr_running or PJT's tracked load or both? How is the threshold defined?

    Best regards,
    Morten

    >
    > V3 change:
    > a, engaged nr_running in max potential utils consideration in periodic
    > power balancing.
    > b, try exec/wake small tasks on running cpu not idle cpu.
    >
    > Thanks comments on previous version. and Any more comments are appreciated!
    >
    > -- Thanks Alex
    >
    > --
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