页帧

页帧组成了主存，因此它是一个存储区域。

A page frame is a constituent of main memory , and hence it is a storage area .

区分开页和页帧是很重要的，前者仅仅是一个数据块，它可以被存储在任何一个页帧中或者在硬盘上。

It is important to distinguish a page from a page frame ; the former is just a block of data , which may be stored in any page frame or on disk .

分页部件认为所有的RAM都被分为固定大小的页帧（有时也叫物理页面）。

The paging unit thinks of all RAM as partitioned into fixed-length page frames ( sometimes referred to as physical pages ) .

这种分页算法决定对当前位于RAM中的哪些虚拟内存页面的页帧进行回收，并放回到空闲列表中。

This paging algorithm determines which virtual memory pages currently in RAM ultimately have their page frames brought back to the free list .

同样要注意，Windows允许进程间共享页帧，比如DLL分配的页帧，常常被多个应用程序同时使用。

It is also important to note that Windows allows page frames to be shared between processes , for example for DLLs , which are often used by several applications at once .

VMM还维护一个称为空闲列表的对象，该对象定义为未分配的页帧。

VMM also maintains what is referred to as a free list , which is defined as unallocated page frames .

可以使用VMM的页面置换算法来选择要重新分配页帧的虚拟内存页面。

The virtual memory pages whose page frames are to be reassigned are selected using the VMM 's page replacement algorithm .

同时，VMM维护了一个未分配页帧的空闲列表，可以使用该列表来处理缺页的问题。

At the same time , VMM maintains a free list of unallocated page frames , which are used to satisfy page faults .

让我们来介绍一下AIX5L中页帧方面一项重要的变化。

Let 's discuss one important change in AIX5L with respect to page frames .

VMM提供了一种页面置换算法，该算法用于分配页帧，以及确定应该将当前RAM中的哪些虚拟内存页面的页帧置换回空闲列表。

The VMM has a page-replacement algorithm , which assigns the page frames and determines exactly which virtual-memory pages currently in RAM will have their page frames brought back to the free list .

VMM常驻内存并在后台运行，尝试替换最近没有使用的页帧，其中使用到前面介绍的页面置换算法。

VMM is constantly lurking and working in the background trying to steal frames that have not been recently referenced , using the page replacement algorithm I discussed earlier .

通常存在少量未分配页面（您可以自行配置），VMM可以使用这些页面来腾出空间并为其重新分配页帧。

There are usually a very small amount of unallocated pages ( which you configure ) that the VMM uses to free up space and reassign the page frames to .

iVCE/M的性能主要取决于内存页帧存取过程中的网络通信开销，隐藏网络通信开销也是本文重点考虑的问题之一。

We consider the approach of hiding the network communication cost in this thesis .

物理内存被划分成大小相同的页帧，页面分配器管理所有的页帧，负责分配和释放物理页面。

The page allocator , which is the manager of all the pages , allocates and frees physical pages .

其余的页帧映射要靠虚拟内存系统的软件部分来实现。

It is the job of the virtual memory system to extend this into software , and to hold extra page-frame mappings .

提交：程序可以访问的内存，得到了完全支持，就是说已经在分页文件中分配了页帧。

Committed : Memory that can be accessed by the program and is fully backed , which means that page frames have been allocated for it in the paging file .

在对有大量内存的系统进行扫描时，因为页面置换算法始终寻找空闲帧，所以需要扫描的页帧数量非常大。

Because the page replacement algorithm is always looking for free frames while it is doing its scanning on systems with a lot of memory , the number of frames to scan can be significant .

内存节点不仅需要响应用户节点存取页帧的操作，还能自动分析用户节点在存取页帧过程中的模式，预测其后续操作，并主动把可能需要的页帧推向用户节点。

The memory node should not only respond the operation of memory page accessing of the user node , but also automatically analyze the pattern of the user node during their accessing , predict the sequential operation , and push the potential needed memory pages to the user node actively .

全书所有文字说明均为中英文对照，共分13章，约260页，500帧照片，12开精装本。

The contents of this Album consists of 13 chapters with about 260 pages in 12 mo de luxe edition involving 500 photos with Chinese-English captions .

这样允许同一页保存在一个页帧，在保存到磁盘后，重新冲磁盘装载到内存时可以放入另一个不同的页帧。

This allows the same page to be stored in a page frame , then saved to disk and later reloaded in a different page frame .

物理存储页组织成大小相同的单位，通常称为页帧。

Physical storage is also organized into equal-sized units , most commonly known as page frames .

操作系统有一种数据结构称为页表，将应用程序访问的虚拟页映射到主存中的实际页帧。

An operating-system data structure called the page table maps the virtual pages accessed by applications to real page frames in main memory .