pvresize extends PVs if the underlying partition has also been extended; it shrinks PV if the allocation map permits it.
pvresize：如果底层分区也已经扩展了，那么可以用这个操作扩展PV；如果分配图允许的话，它也可以缩小 PV。
The final component for allocation is the cluster map.
分配的最后组件是集群映射。
Automatic allocation of secondary partition header pages for extending the extent map.
用于扩展区段映射的二级分区头文件页的自动分配。
Apart from the memory allocation changes, the remap_page_range call — which is used to map pages to user space — has been modified slightly.
除了内存分配的变化以外，remap _ page_range调用——用来映射页到用户空间——也经过了少量修改。
Rather than rely on allocation lists (metadata to map blocks on a disk to a given file), Ceph USES an interesting alternative.
Ceph使用一个有趣的备选，而不是依赖分配列表(将磁盘上的块映射到指定文件的元数据)。
The use of digital map to show that the distribution of main memory, the realization of main memory space allocation and recovery.
采用位示图来表示主存分配情况，实现主存空间的分配和回收。
The use of digital map to show that the distribution of main memory, the realization of main memory space allocation and recovery.
采用位示图来表示主存分配情况，实现主存空间的分配和回收。
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