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    SubjectRe: [patch v5 04/15] sched: add sched balance policies in kernel

    * Alex Shi <alex.shi@intel.com> wrote:

    > Current scheduler behavior is just consider for larger
    > performance of system. So it try to spread tasks on more cpu
    > sockets and cpu cores
    >
    > To adding the consideration of power awareness, the patchset
    > adds 2 kinds of scheduler policy: powersaving and balance.
    > They will use runnable load util in scheduler balancing. The
    > current scheduling is taken as performance policy.
    >
    > performance: the current scheduling behaviour, try to spread tasks
    > on more CPU sockets or cores. performance oriented.
    > powersaving: will pack tasks into few sched group until all LCPU in the
    > group is full, power oriented.
    > balance : will pack tasks into few sched group until group_capacity
    > numbers CPU is full, balance between performance and
    > powersaving.

    Hm, so in a previous review I suggested keeping two main
    policies: power-saving and performance, plus a third, default
    policy, which automatically switches between these two if/when
    the kernel has information about whether a system is on battery
    or on AC - and picking 'performance' when it has no information.

    Such an automatic policy would obviously be useful to users -
    and that is what makes such a feature really interesting and a
    step forward.

    I think Peter expressed similar views: we don't want many knobs
    and states, we want two major goals plus an (optional but
    default enabled) automatism.

    Is your 'balance' policy implementing that suggestion?
    If not, why not?

    Thanks,

    Ingo


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