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<!DOCTYPE html>
<html class="theme-next pisces use-motion" lang="">
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<script type="text/javascript" id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
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sidebar: {"position":"left","display":"post","offset":12,"b2t":false,"scrollpercent":false,"onmobile":false},
fancybox: false,
fastclick: false,
lazyload: false,
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motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
algolia: {
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<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
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<link itemprop="mainEntityOfPage" href="http://yoursite.com/2020/03/23/process-address/">
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进程地址空间
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<div class="post-meta">
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<span class="post-meta-item-text">Posted on</span>
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<div class="post-body" itemprop="articleBody">
进程的地址空间
由允许进程使用的全部线性地址组成
与创建、删除线性区相关的系统调用
内存描述符
内存描述符：包含与进程地址空间有关的全部信息。详细字段见P354
线性区
每个线性区描述符表示一个线性地址空间
线性区对象的字段
线性区数据结构
进程所拥有的所有线性区通过链表链接在一起
内
...
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<link itemprop="mainEntityOfPage" href="http://yoursite.com/2020/03/21/memory-management/">
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内存管理
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<div class="post-body" itemprop="articleBody">
页框管理
Linux采用4KB页框大小作为标准内存分配单元
页描述符
描述页框的信息
页描述符字段
_count: 页的引用计数器，该字段为-1标示页框空闲
flags: 描述页框状态的标志
非一致内存访问（NUMA）
不同CPU访问页面所需的时间不一样
对于每个CPU，内核试图把耗时
...
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<link itemprop="mainEntityOfPage" href="http://yoursite.com/2020/03/20/process-schedule/">
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进程调度
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</h1>
<div class="post-meta">
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<div class="post-body" itemprop="articleBody">
调度策略
目标
进程响应时间尽可能快
作业吞吐量尽可能高
尽可能避免进程的饥饿现象
低优先级和高优先级进程尽可能调和
Linux进程调度
基于分时方式
动态优先级，避免饿死
进程分类
交互式进程： 响应时间要求高
批处理进程： 不需要尽快响应，吞吐量尽可能大
实时进程：响应时间要求高
...
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定时测量
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</h1>
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