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处理器的存储子系统(三)– 页表和TLB

2011年1月22日 发表评论 阅读评论

之前一时冲动,说要写三篇关于处理器存储系统的文章,之前写过了概述Cache,其实写到后面就不太想写了,但是想到不写岂不自己打自己嘴巴,只好硬着头皮把最后一篇关于页表和TLB的写完。既然是硬着头皮写,其质量也就不敢保证了,有错误也在所难免,各位看官需要自行甄别。

Cache的那篇文章中已经讲到,为了区分不同进程的存储空间,现在多任务的操作系统以及处理器都需要支持虚地址(Virtual Address, VA)实地址(Physical Address, PA)转化,虚实地址转换主要分为两种:

  1. 由于整个系统的进程数不定,每个进程所需要的内存不定,以及进程切换的不确定性,因此,虚实地址转化不能简单的将某个连续大内存块映射到某个进程(Coarse-grained),必须采取更细粒度(Final-grained)的映射,即将一些可能不连续的小内存块(比如4K大小)一起映射到进程,形成一块连续的虚拟地址。为了记录这些映射信息,需要页表(Page)。但是页表的导入引入了新的问题,那就是每次访存变成了两次,一次查询页表,得到物理地址,第二次通过物理地址取数(事实上有办法把这两个过程部分并行起来,详见Cache的那篇)。为了提高查询页表的速度,现在的处理器都为页表做了一个小Cache,叫做旁路转换缓冲(Translation lookaside buffer, TLB)。
  2. 直接映射,比如直接将64位的虚拟地址高位抹去,得到物理地址。这主要用于操作系统启动时的那块内存区域。主要是由于系统刚启动时,第1种转化所需要的页表,TLB没有初始化(页表,TLB其实都是操作系统管理的,倘若还用第一种,就陷入了鸡生蛋,蛋生鸡的死循环了),只能用这种最简单粗暴的办法。
    由于第二种比较简单,在这里主要讲一下第1种虚实地址转化,即通过页表和TLB进行虚实地址转化。
    用固定大小的页(Page)来描述逻辑地址空间,用相同大小的页框(Frame)来描述物理内存空间,由操作系统实现从逻辑页到物理页框的页面映射,同时负责对所有页的管理和进程运行的控制.用页表进行虚实地址转化的基本原理如下图:
     

    首先,用虚地址的高位(叫做虚页号,Virtual Page Num,对应着一个小内存块)查询页表,得到其物理页框(Physical Page Frame)地址,然后用物理页框地址和虚地址的低位(偏移量,Page offset)得到物理地址。其中上面的偏移量决定了每个页表项的大小,在现代通用处理器中,一般为4K。

    理论上,页表里面表项的数目和虚地址的高位数目有关,等于虚地址高位所能表示的最大值。因此,其数目非常可观,为了减少页表大小,出现了多级分页技术。

    当进行虚实地址转化时,查询页表发现页表不在主存,就会出现缺页例外(Page fault)。缺页中断需要操作系统把所需要的页表文件加载入主存,然后继续查询,这会消耗大量时间。

    即使页表在主存中,查询也会消耗大量的时间,因此,利用局部性原理,现代处理器在其内部实现了一个页表的高速缓存,即TLB。当虚实地址转化时,先去TLB中查询页表是否存在,只有不存在时(此时发生TLB miss例外),再去主存中查询,当主存中还没有时,直接去物理存储查询(此时发生缺页例外)。

    现代分页技术中,几个最关键的问题是:

    一是如何提高TLB命中率,一种办法是加大TLB大小,这种办法很好理解,第二种办法是加大页大小,这样同样大小的存储区域所需要的页表数目大大减少,相当与增大了TLB。

二是如何减少缺失的损耗,其中的一种方法是增加一个类似于victim cache的victim TLB。

三是如何让虚实地址转化和访存并行起来,起码和访问Cache并行起来,方法是实现虚地址Cache,详见Cache篇

第四个是如何实现低功耗的TLB,现在有很多解决方案,比如说进行TLB预比较,增加一级TLB等。



本文作者: Sigma    在新浪微博关注SigmaSigmaWeibo    RSS订阅本博客
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