mem_watcher:解决了nr_zones获取的问题,并添加了nuam架构下的内存碎片化指数计算 #927
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1、查看/proc下有关nr_zones的计算代码,重写了获取nr_zones的代码,确保获取的nr_zones正确
2、在numa架构下对于不同的区域针对不同分配阶数计算了内存碎片化程度指数