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    Subject[patch v6 17/21] sched: no balance for prefer_sibling in power scheduling
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    In power aware scheduling, we don't want to balance 'prefer_sibling'
    groups just because local group has capacity.
    If the local group has no tasks at the time, that is the power
    balance hope so.

    Signed-off-by: Alex Shi <alex.shi@intel.com>
    ---
    kernel/sched/fair.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index d25fb3b..0a53e2a 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -4772,8 +4772,12 @@ static inline void update_sd_lb_stats(struct lb_env *env,
    * extra check prevents the case where you always pull from the
    * heaviest group when it is already under-utilized (possible
    * with a large weight task outweighs the tasks on the system).
    + *
    + * In power aware scheduling, we don't care load weight and
    + * want not to pull tasks just because local group has capacity.
    */
    - if (prefer_sibling && !local_group && sds->this_has_capacity)
    + if (prefer_sibling && !local_group && sds->this_has_capacity
    + && env->flags & LBF_PERF_BAL)
    sgs.group_capacity = min(sgs.group_capacity, 1UL);

    if (local_group) {
    --
    1.7.12


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