ch6.htm

汤子瀛《操作系统》电子教案

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      <p style="TEXT-ALIGN: center" align="center"><font color="#FFFFFF"><a name="ch64"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"></span></a><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">6</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">．</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">4<span style="mso-spacerun: yes">&nbsp;   
      </span></span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">请求分页系统的性能分析</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l4 level1 lfo19; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">1．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">缺页中断率对有效访问时间的影响</span></font></p>
      <p style="MARGIN-LEFT: 18pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">影响缺页中断率的因素：</font></span></p>
      <p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">分配给程序的主存块数；</span></font></p>
      <p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">页面的大小；</span></font></p>
      <p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">程序本身的编制方法；</span></font></p>
      <p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">页面置换算法。</span></font></p>
      <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l4 level1 lfo19; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">2．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">工作集</span></font></p>
      <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l4 level1 lfo19; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">3．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">抖动产生的原因和预防方法</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑴抖动产生的原因</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑵抖动的预防</span></font></p>
      <p style="MARGIN-LEFT: 36pt; TEXT-INDENT: -12pt; mso-list: l19 level1 lfo20; tab-stops: list 36.0pt"><font color="#FFFFFF"><span lang="EN-US" style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">①</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">采取局部置换策略</span></font></p>
      <p style="MARGIN-LEFT: 36pt; TEXT-INDENT: -12pt; mso-list: l19 level1 lfo20; tab-stops: list 36.0pt"><font color="#FFFFFF"><span lang="EN-US" style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">②</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">在</span><span lang="EN-US">CPU</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">调度程序中引入工作集算法</span></font></p>
      <p style="MARGIN-LEFT: 36pt; TEXT-INDENT: -12pt; mso-list: l19 level1 lfo20; tab-stops: list 36.0pt"><font color="#FFFFFF"><span lang="EN-US" style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">③</span><span lang="EN-US">L=S</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">准则</span></font></p>
      <p style="MARGIN-LEFT: 24pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">④挂起若干进程</font></span></p>
      <p><span style="mso-spacerun: yes" lang="EN-US"><font color="#FFFFFF">&nbsp;</font></span></td>
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      <p style="TEXT-ALIGN: center" align="center"><font color="#FFFFFF"><a name="ch65"><span style="mso-bidi-font-size: 10.0pt" lang="EN-US"></span></a><span style="mso-bidi-font-size: 10.0pt" lang="EN-US">6</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">．</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">5<span style="mso-spacerun: yes">&nbsp;   
      </span></span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">请求分段存储管理方式</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l15 level1 lfo10; tab-stops: list 18.0pt"><font color="#FFFFFF"><span lang="EN-US">1．</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">请求分段中的硬件支持</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑴段表机制</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑵缺段中断机构</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑶地址变换机构</span></font></p>
      <p><font color="#FFFFFF"><span lang="EN-US">2</span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">．分段共享与保护</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑴共享段</span></font></p>
      <p style="TEXT-INDENT: 24pt"><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman"><font color="#FFFFFF">共享进程计数、存取控制字段、段号</font></span></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑵共享段的分配与回收</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">⑶分段保护</span></font></p>
      <p><font color="#FFFFFF"><span style="mso-spacerun: yes" lang="EN-US">&nbsp;&nbsp;&nbsp;   
      </span><span style="mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">越界检查、存取控制检查、环保护机构</span></font></p>
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