!256 sched: Supprot dynamic affinity in scheduler

Merge Pull Request from: @zhangjian210 
 
This pathchset support dynamic affinity feature.

Dynamic affinity set preferred cpus for task. When the utilization of
taskgroup's preferred cpu is low, task only run in cpus preferred to
enhance cpu resource locality and reduce interference between task cgroups,
otherwise task can burst preferred cpus to use external cpu within
cpus allowed. 
 
Link:https://gitee.com/openeuler/kernel/pulls/256

 

Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com>
Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>