3070 lines
118 KiB
HTML
3070 lines
118 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
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<meta name=Generator content="Microsoft Word 14 (filtered)">
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<style>
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p
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pre
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tt
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p.1, li.1, div.1
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|
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<div class=WordSection1 style='layout-grid:15.6pt'>
|
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|
||
<p class=ab><span style='font-family:黑体'>程序</span><span lang=EN-US>13-3 linux/mm/swap.c</span></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u> <b><i> *
|
||
linux/mm/swap.c</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u> <b><i> *
|
||
This file should contain most things doing the swapping from/to disk.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u> <b><i> *
|
||
Started 18.12.91</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>本程序应该包括绝大部分执行内存交换的代码（从内存到磁盘或反之）。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>从<span
|
||
lang=EN-US>91</span>年<span lang=EN-US>12</span>月<span lang=EN-US>18</span>日开始编制。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</span></u>
|
||
#include <string.h> // </span>字符串头文件。定义了一些有关内存或字符串操作的嵌入函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u>
|
||
#include <linux/mm.h> // </span>内存管理头文件。定义页面长度，和一些内存管理函数原型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u>
|
||
#include <linux/sched.h> // </span>调度程序头文件。定义了任务结构<span lang=EN-US>task_struct</span>、任务<span
|
||
lang=EN-US>0</span>的数据，</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
// </span>还有一些有关描述符参数设置和获取的嵌入式汇编函数宏语句。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u>
|
||
#include <linux/head.h> // head</span>头文件。定义了段描述符的简单结构，和几个选择符常量。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u>
|
||
#include <linux/kernel.h> // </span>内核头文件。含有一些内核常用函数的原型定义。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>每个字节<span lang=EN-US>8</span>位，因此<span
|
||
lang=EN-US>1</span>页（<span lang=EN-US>4096</span>字节）共有<span lang=EN-US>32768</span>个比特位。若<span
|
||
lang=EN-US>1</span>个比特位对应<span lang=EN-US>1</span>页内存，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则最多可管理<span
|
||
lang=EN-US>32768</span>个页面，对应<span lang=EN-US>128MB</span>内存容量。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u>
|
||
#define <u><span style='color:blue'>SWAP_BITS</span></u> (4096<<3)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>比特位操作宏。通过给定不同的<span
|
||
lang=EN-US>"op"</span>，可定义对指定比特位进行测试、设置或清除三种操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>addr</span>是指定线性地址；<span
|
||
lang=EN-US>nr</span>是指定地址处开始的比特位偏移位。该宏把给定地址<span lang=EN-US>addr</span>处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>nr</span>个比特位的值放入进位标志，设置或复位该比特位并返回进位标志值（即原比特位值）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>25</span>行上第一个指令随<span
|
||
lang=EN-US>"op"</span>字符的不同而组合形成不同的指令：</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当<span lang=EN-US>"op"=
|
||
""</span>时，就是指令<span lang=EN-US>bt – </span>（<span lang=EN-US>Bit
|
||
Test</span>）测试并用原值设置进位位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当<span lang=EN-US>"op"="s"</span>时，就是指令<span
|
||
lang=EN-US>bts - </span>（<span lang=EN-US>Bit Test and Set</span>）设置比特位值并用原值设置进位位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当<span lang=EN-US>"op"="r"</span>时，就是指令<span
|
||
lang=EN-US>btr - </span>（<span lang=EN-US>Bit Test and Reset</span>）复位比特位值并原值设置进位位。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入：<span lang=EN-US>%0
|
||
– </span>（返回值<span lang=EN-US>)</span>，<span lang=EN-US>%1 -</span>位偏移<span
|
||
lang=EN-US>(nr)</span>；<span lang=EN-US>%2 –</span>基址<span lang=EN-US>(addr)</span>；<span
|
||
lang=EN-US>%3 – </span>加操作寄存器初值<span lang=EN-US>(0)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>内嵌汇编代码把基地址（<span
|
||
lang=EN-US>%2</span>）和比特偏移值（<span lang=EN-US>%1</span>）所指定的比特位值先保存到进位标志<span
|
||
lang=EN-US>CF</span>中，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后设置（复位）该比特位。指令<span
|
||
lang=EN-US>adcl</span>是带进位位加，用于根据进位位<span lang=EN-US>CF</span>设置操作数（<span
|
||
lang=EN-US>%0</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>CF
|
||
= 1 </span>则返回寄存器值 <span lang=EN-US>= 1</span>，否则返回寄存器值 <span lang=EN-US>= 0 </span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u>
|
||
#define <u><span style='color:blue'>bitop</span></u>(name,op) \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u>
|
||
static inline int name(char * addr,unsigned int nr) \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u> { \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u> int
|
||
__res; \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u>
|
||
__asm__ __volatile__(<i>"bt"</i> op <i>" %1,%2; adcl $0,%0"</i>
|
||
\</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u> :<i>"=g"</i>
|
||
(__res) \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u> :<i>"r"</i>
|
||
(nr),<i>"m"</i> (*(addr)),<i>"0"</i> (0)); \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u>
|
||
return __res; \</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这里根据不同的<span
|
||
lang=EN-US>op</span>字符定义<span lang=EN-US>3</span>个内嵌函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u> <u><span
|
||
style='color:blue'>bitop</span></u>(bit,<i>""</i>)
|
||
// </span>定义内嵌函数<span lang=EN-US> bit(char * addr, unsigned int nr)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u> <u><span
|
||
style='color:blue'>bitop</span></u>(setbit,<i>"s"</i>)
|
||
// </span>定义内嵌函数<span lang=EN-US> setbit(char * addr, unsigned int nr)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u> <u><span
|
||
style='color:blue'>bitop</span></u>(clrbit,<i>"r"</i>)
|
||
// </span>定义内嵌函数<span lang=EN-US> clrbit(char * addr, unsigned int nr)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
static char * <u><span style='color:blue'>swap_bitmap</span></u> = <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u> int
|
||
<u><span style='color:blue'>SWAP_DEV</span></u> = 0;
|
||
// </span>内核初始化时设置的交换设备号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u> <b><i> *
|
||
We never page the pages in task[0] - kernel memory.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u> <b><i> *
|
||
We page all other pages.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>我们从不交换任务<span
|
||
lang=EN-US>0</span>（<span lang=EN-US>task[0]</span>）的页面 <span lang=EN-US>– </span>即不交换内核页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>我们只对其他页面进行交换操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>1</span>个虚拟内存页面。即从任务<span
|
||
lang=EN-US>0</span>末端（<span lang=EN-US>64MB</span>）处开始的虚拟内存页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
#define <u><span style='color:blue'>FIRST_VM_PAGE</span></u> (<u><span
|
||
style='color:blue'>TASK_SIZE</span></u>>>12)
|
||
// = 64MB/4KB = 16384</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u>
|
||
#define <u><span style='color:blue'>LAST_VM_PAGE</span></u> (1024*1024)
|
||
// = 4GB/4KB = 1048576</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u>
|
||
#define <u><span style='color:blue'>VM_PAGES</span></u> (<u><span
|
||
style='color:blue'>LAST_VM_PAGE</span></u> - <u><span style='color:blue'>FIRST_VM_PAGE</span></u>)
|
||
// = 1032192</span>（从<span lang=EN-US>0</span>开始计）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>申请<span lang=EN-US>1</span>页交换页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描整个交换映射位图（除对应位图本身的位<span
|
||
lang=EN-US>0</span>以外），返回值为<span lang=EN-US>1</span>的第一个比特位号，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>即目前空闲的交换页面号。若操作成功则返回交换页面号，否则返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u>
|
||
static int <u><span style='color:blue'>get_swap_page</span></u>(void)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u>
|
||
int nr;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
if (!<u><span style='color:blue'>swap_bitmap</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u>
|
||
for (nr = 1; nr < 32768 ; nr++)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
if (clrbit(<u><span style='color:blue'>swap_bitmap</span></u>,nr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
return nr;
|
||
// </span>返回目前空闲的交换页面号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>释放交换设备中指定的交换页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在交换位图中设置指定页面号对应的比特位（置<span
|
||
lang=EN-US>1</span>）。若原来该比特位就等于<span lang=EN-US>1</span>，则表示</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>交换设备中原来该页面就没有被占用，或者位图出错。于是显示出错信息并返回。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数指定交换页面号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
void <u><span style='color:blue'>swap_free</span></u>(int swap_nr)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
if (!swap_nr)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u>
|
||
if (<u><span style='color:blue'>swap_bitmap</span></u> && swap_nr < <u><span
|
||
style='color:blue'>SWAP_BITS</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
if (!setbit(<u><span style='color:blue'>swap_bitmap</span></u>,swap_nr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Swap-space bad
|
||
(swap_free())\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>把指定页面交换进内存中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>把指定页表项的对应页面从交换设备中读入到新申请的内存页面中。修改交换位图中对应</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>比特位（置位），同时修改页表项内容，让它指向该内存页面，并设置相应标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u>
|
||
void <u><span style='color:blue'>swap_in</span></u>(unsigned long *table_ptr)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u>
|
||
int swap_nr;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u>
|
||
unsigned long page;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先检查交换位图和参数有效性。如果交换位图不存在，或者指定页表项对应的页面已存在</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>于内存中，或者交换页面号为<span
|
||
lang=EN-US> 0</span>，则显示警告信息并退出。对于已放到交换设备中去的内存</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>页面，相应页表项中存放的应是交换页面号<span
|
||
lang=EN-US>*2</span>，即<span lang=EN-US>(swap_nr << 1)</span>，参见下面对尝试交换函</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>数<span lang=EN-US>try_to_swap_out()</span>中第<span
|
||
lang=EN-US>111</span>行的说明。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u>
|
||
if (!<u><span style='color:blue'>swap_bitmap</span></u>) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Trying to swap in
|
||
without swap bit-map"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
if (1 & *table_ptr) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"trying to swap in present
|
||
page\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
swap_nr = *table_ptr >> 1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
if (!swap_nr) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"No swap page in
|
||
swap_in\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后申请一页物理内存并从交换设备中读入页面号为<span
|
||
lang=EN-US>swap_nr</span>的页面。在把页面交换进来</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>后，就把交换位图中对应比特位置位。如果其原本就是置位的，说明此次是再次从交换设</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>备中读入相同的页面，于是显示一下警告信息。最后让页表项指向该物理页面，并设置页</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>面已修改、用户可读写和存在标志（<span
|
||
lang=EN-US>Dirty</span>、<span lang=EN-US>U/S</span>、<span lang=EN-US>R/W</span>、<span
|
||
lang=EN-US>P</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
if (!(page = <u><span style='color:blue'>get_free_page</span></u>()))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
<u><span style='color:blue'>oom</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
<u><span style='color:blue'>read_swap_page</span></u>(swap_nr, (char *) page);
|
||
// </span>在<span lang=EN-US>include/linux/mm.h</span>中定义。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
if (setbit(<u><span style='color:blue'>swap_bitmap</span></u>,swap_nr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"swapping in multiply
|
||
from same page\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
*table_ptr = page | (<u><span style='color:blue'>PAGE_DIRTY</span></u> | 7);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>尝试把页面交换出去。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若页面没有被修改过则不用保存在交换设备中，因为对应页面还可以再直接从相应映像文件</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中读入。于是可以直接释放掉相应物理页面了事。否则就申请一个交换页面号，然后把页面</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>交换出去。此时交换页面号要保存在对应页表项中，并且仍需要保持页表项存在位<span
|
||
lang=EN-US>P = 0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数是页表项指针。页面交换或释放成功返回<span
|
||
lang=EN-US>1</span>，否则返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u> int
|
||
<u><span style='color:blue'>try_to_swap_out</span></u>(unsigned long *
|
||
table_ptr)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
unsigned long page;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
unsigned long swap_nr;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先判断参数的有效性。若需要交换出去的内存页面并不存在（或称无效），则即可退出。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若页表项指定的物理页面地址大于分页管理的内存高端<span
|
||
lang=EN-US>PAGING_MEMORY</span>（<span lang=EN-US>15MB</span>），也退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US> page = *table_ptr;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US> if (!(<u><span
|
||
style='color:blue'>PAGE_PRESENT</span></u> & page))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US> return
|
||
0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> if (page - <u><span
|
||
style='color:blue'>LOW_MEM</span></u> > <u><span style='color:blue'>PAGING_MEMORY</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若内存页面已被修改过，但是该页面是被共享的，那么为了提高运行效率，此类页面不宜</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>被交换出去，于是直接退出，函数返回<span
|
||
lang=EN-US>0</span>。否则就申请一交换页面号，并把它保存在页表</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>项中，然后把页面交换出去并释放对应物理内存页面。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>PAGE_DIRTY</span></u> & page) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US>
|
||
page &= 0xfffff000;
|
||
// </span>取物理页面地址。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>mem_map</span></u>[<u><span style='color:blue'>MAP_NR</span></u>(page)]
|
||
!= 1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US>
|
||
if (!(swap_nr = <u><span style='color:blue'>get_swap_page</span></u>()))
|
||
// </span>申请交换页面号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>对于要到交换设备中的页面，相应页表项中将存放的是<span
|
||
lang=EN-US>(swap_nr << 1)</span>。 乘<span lang=EN-US>2</span>（左移<span
|
||
lang=EN-US>1</span>位）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>是为了空出原来页表项的存在位（<span
|
||
lang=EN-US>P</span>）。只有存在位<span lang=EN-US>P=0</span>并且页表项内容不为<span lang=EN-US>0</span>的页面才会</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在交换设备中。<span
|
||
lang=EN-US> Intel</span>手册中明确指出，当一个表项的存在位<span lang=EN-US> P = 0</span>时（无效页表项），</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>所有其他位（位<span
|
||
lang=EN-US>31—1</span>）可供随意使用。下面写交换页函数<span lang=EN-US>write_swap_page(nr,
|
||
buffer)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>被定义为<span lang=EN-US>ll_rw_page(WRITE,SWAP_DEV,(nr),(buffer))</span>。参见<span
|
||
lang=EN-US>linux/mm.h </span>文件第<span lang=EN-US>12</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US>
|
||
*table_ptr = swap_nr<<1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>invalidate</span></u>();
|
||
//
|
||
</span>刷新<span lang=EN-US>CPU</span>页变换高速缓冲。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>write_swap_page</span></u>(swap_nr, (char *) page);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>free_page</span></u>(page); </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US>
|
||
return 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则表明页面没有修改过。那么就不用交换出去，而直接释放即可。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> *table_ptr = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>invalidate</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>free_page</span></u>(page);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US> return 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US> <b><i> * Ok, this has a rather intricate logic - the idea is
|
||
to make good</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> <b><i> * and fast machine code. If we didn't worry about that,
|
||
things would</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US> <b><i> * be easier.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * OK</span>，这个函数中有一个非常复杂的逻辑
|
||
<span lang=EN-US>– </span>用于产生逻辑性好并且速度快的</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>机器码。如果我们不对此操心的话，那么事情可能更容易些。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>把内存页面放到交换设备中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>从线性地址<span lang=EN-US>64MB</span>对应的目录项（<span
|
||
lang=EN-US>FIRST_VM_PAGE>>10</span>）开始，搜索整个<span lang=EN-US>4GB</span>线性空间，对有</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>效页目录二级页表的页表项指定的物理内存页面执行交换到交换设备中去的尝试。一旦成功</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>地换出一个页面，就返回<span
|
||
lang=EN-US>1</span>。否则返回<span lang=EN-US>0</span>。该函数会在<span lang=EN-US>get_free_page()</span>中被调用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>swap_out</span></u>(void)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> static int <u><span
|
||
style='color:blue'>dir_entry</span></u> = <u><span style='color:blue'>FIRST_VM_PAGE</span></u>>>10;
|
||
// </span>即任务<span lang=EN-US>1</span>的第<span lang=EN-US>1</span>个目录项索引。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US> static int
|
||
page_entry = -1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> int counter = <u><span
|
||
style='color:blue'>VM_PAGES</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> int pg_table;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先搜索页目录表，查找二级页表存在的页目录项<span
|
||
lang=EN-US>pg_table</span>。找到则退出循环，否则调整</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>页目录项数对应剩余二级页表项数<span
|
||
lang=EN-US>counter</span>，然后继续检测下一页目录项。 若全部搜索完</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>还没有找到适合的（存在的）页目录项，就重新继续搜索。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> while
|
||
(counter>0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US>
|
||
pg_table = <u><span style='color:blue'>pg_dir</span></u>[<u><span
|
||
style='color:blue'>dir_entry</span></u>];
|
||
// </span>页目录项内容。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US>
|
||
if (pg_table & 1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
|
||
lang=EN-US>
|
||
counter -= 1024;
|
||
// 1</span>个页表对应<span
|
||
lang=EN-US>1024</span>个页帧。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>dir_entry</span></u>++;
|
||
// </span>下一目录项。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>dir_entry</span></u> >= 1024)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>dir_entry</span></u> = <u><span style='color:blue'>FIRST_VM_PAGE</span></u>>>10;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在取得当前目录项的页表指针后，针对该页表中的所有<span
|
||
lang=EN-US> 1024 </span>个页面，逐一调用交换函数</p>
|
||
|
||
<p class=a><span lang=EN-US> // try_to_swap_out()</span>尝试交换出去。一旦某个页面成功交换到交换设备中就返回<span
|
||
lang=EN-US>1</span>。若对所</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>有目录项的所有页表都已尝试失败，则显示“交换内存用完”的警告，并返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> pg_table &=
|
||
0xfffff000;
|
||
// </span>页表指针（地址）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US> while (counter--
|
||
> 0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US>
|
||
page_entry++; //
|
||
</span>页表项索引（初始为<span lang=EN-US>-1</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果已经尝试处理完当前页表所有项还没有能够成功地交换出一个页面，即此时页表项索引</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>大于等于<span lang=EN-US>1024</span>，则如同前面第<span
|
||
lang=EN-US>135 – 143</span>行执行相同的处理来选出一个二级页表存在的页</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>目录项，并取得相应二级页表指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US>
|
||
if (page_entry >= 1024) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US>
|
||
page_entry = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> repeat:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>dir_entry</span></u>++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>dir_entry</span></u> >= 1024)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>dir_entry</span></u> = <u><span style='color:blue'>FIRST_VM_PAGE</span></u>>>10;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US>
|
||
pg_table = <u><span style='color:blue'>pg_dir</span></u>[<u><span
|
||
style='color:blue'>dir_entry</span></u>]; // </span>页目录项内容。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> if
|
||
(!(pg_table&1))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
if ((counter -= 1024) > 0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US>
|
||
else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US>
|
||
pg_table &= 0xfffff000; // </span>页表指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>try_to_swap_out</span></u>(page_entry +
|
||
(unsigned long *) pg_table))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US>
|
||
return 1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>printk</span></u>(<i>"Out of swap-memory\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US> return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US> <b><i> * Get physical address of first (actually last :-) free
|
||
page, and mark it</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US> <b><i> * used. If no free pages left, return 0.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>获取首个<span
|
||
lang=EN-US>(</span>实际上是最后<span lang=EN-US>1</span>个<span lang=EN-US>:-)</span>空闲页面，并标记为已使用。如果没有空闲页面，</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>就返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在主内存区中申请<span
|
||
lang=EN-US>1</span>页空闲物理页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果已经没有可用物理内存页面，则调用执行交换处理。然后再次申请页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输入：<span lang=EN-US>%1(ax=0)
|
||
- 0</span>；<span lang=EN-US>%2(LOW_MEM)</span>内存字节位图管理的起始位置；<span lang=EN-US>%3(cx=
|
||
PAGING_PAGES)</span>；</p>
|
||
|
||
<p class=a><span lang=EN-US> // %4(edi=mem_map+PAGING_PAGES-1)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>输出：返回<span lang=EN-US>%0</span>（<span
|
||
lang=EN-US>ax = </span>物理页面起始地址）。函数返回新页面的物理地址。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>上面<span lang=EN-US>%4</span>寄存器实际指向<span
|
||
lang=EN-US>mem_map[]</span>内存字节位图的最后一个字节。本函数从位图末端开始向</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>前扫描所有页面标志（页面总数为<span
|
||
lang=EN-US>PAGING_PAGES</span>），若有页面空闲（内存位图字节为<span lang=EN-US>0</span>）则</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回页面地址。注意！本函数只是指出在主内存区的一页空闲物理页面，但并没有映射到某</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>个进程的地址空间中去。后面的 <span
|
||
lang=EN-US>put_page() </span>函数即用于把指定页面映射到某个进程的地址</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>空间中。当然对于内核使用本函数并不需要再使用
|
||
<span lang=EN-US>put_page() </span>进行映射，因为内核代码和</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>数据空间（<span lang=EN-US>16MB</span>）已经对等地映射到物理地址空间。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>第<span lang=EN-US>65</span>行定义了一个局部寄存器变量。该变量将被保存在
|
||
<span lang=EN-US>eax</span>寄存器中，以便于高效访问和</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>操作。这种定义变量的方法主要用于内嵌汇编程序中。详细说明参见<span
|
||
lang=EN-US>gcc</span>手册“在指定寄存</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>器中的变量”。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US> unsigned long <u><span style='color:blue'>get_free_page</span></u>(void)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US> register unsigned long __res asm(<i>"ax"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先在内存映射字节位图中查找值为<span
|
||
lang=EN-US>0</span>的字节项，然后把对应物理内存页面清零。如果得到</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的页面地址大于实际物理内存容量则重新寻找。如果没有找到空闲页面则去调用执行交换处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>理，并重新查找。最后返回空闲物理页面地址。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US> repeat:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> __asm__(<i>"std ; repne ; scasb\n\t"</i>
|
||
// </span>置方向位，<span lang=EN-US>al(0)</span>与对应每个页面的<span lang=EN-US>(di)</span>内容比较，</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US> <i>"jne
|
||
1f\n\t"</i>
|
||
// </span>如果没有等于<span lang=EN-US>0</span>的字节，则跳转结束（返回<span lang=EN-US>0</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> <i>"movb
|
||
$1,1(%%edi)\n\t"</i> // 1
|
||
=>[1+edi], </span>将对应页面内存映像比特位置<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US> <i>"sall
|
||
$12,%%ecx\n\t"</i>
|
||
// </span>页面数<span lang=EN-US>*4K = </span>相对页面起始地址。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US> <i>"addl
|
||
%2,%%ecx\n\t"</i>
|
||
// </span>再加上低端内存地址，得页面实际物理起始地址。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%ecx,%%edx\n\t"</i> // </span>将页面实际起始地址<span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>edx</span>寄存器。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
$1024,%%ecx\n\t"</i> // </span>寄存器<span
|
||
lang=EN-US>ecx</span>置计数值<span lang=EN-US>1024</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US> <i>"leal
|
||
4092(%%edx),%%edi\n\t"</i> // </span>将<span lang=EN-US>4092+edx</span>的位置<span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>edi</span>（该页面的末端）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US> <i>"rep ;
|
||
stosl\n\t"</i>
|
||
// </span>将<span lang=EN-US>edi</span>所指内存清零（反方向，即将该页面清零）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US> <i>"movl
|
||
%%edx,%%eax\n"</i>
|
||
// </span>将页面起始地址<span lang=EN-US style='font-family:Wingdings'>è</span><span
|
||
lang=EN-US>eax</span>（返回值）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> <i>"1:"</i></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US> :<i>"=a"</i>
|
||
(__res)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US> :<i>"0"</i>
|
||
(0),<i>"i"</i> (<u><span style='color:blue'>LOW_MEM</span></u>),<i>"c"</i>
|
||
(<u><span style='color:blue'>PAGING_PAGES</span></u>),</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US> <i>"D"</i>
|
||
(<u><span style='color:blue'>mem_map</span></u>+<u><span style='color:blue'>PAGING_PAGES</span></u>-1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US> :<i>"di"</i>,<i>"cx"</i>,<i>"dx"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US> if (__res >= <u><span
|
||
style='color:blue'>HIGH_MEMORY</span></u>) // </span>页面地址大于实际内存容量则重新寻找。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US> if (!__res
|
||
&& <u><span style='color:blue'>swap_out</span></u>())
|
||
// </span>若没得到空闲页面则执行交换处理，并重新查找。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US> return __res;
|
||
// </span>返回空闲物理页面地址。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>内存交换初始化。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US> void <u><span style='color:blue'>init_swapping</span></u>(void)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // blk_size[]</span>指向指定主设备号的块设备块数数组。该块数数组每一项对应一个子设备上所</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>拥有的数据块总数（<span
|
||
lang=EN-US>1</span>块大小<span lang=EN-US>=1KB</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> extern int *<u><span
|
||
style='color:blue'>blk_size</span></u>[];
|
||
// blk_drv/ll_rw_blk.c</span>，<span lang=EN-US>49</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> int swap_size,i,j;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果没有定义交换设备则返回。如果交换设备没有设置块数数组，则显示信息并返回。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US> if (!<u><span
|
||
style='color:blue'>SWAP_DEV</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> if (!<u><span
|
||
style='color:blue'>blk_size</span></u>[<u><span style='color:blue'>MAJOR</span></u>(<u><span
|
||
style='color:blue'>SWAP_DEV</span></u>)]) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Unable to get size of
|
||
swap device\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>取指定交换设备号的交换区数据块总数<span
|
||
lang=EN-US>swap_size</span>。若为<span lang=EN-US>0</span>则返回，若总块数小于<span
|
||
lang=EN-US>100</span>块</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则显示信息“交换设备区太小”，然后退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US> swap_size = <u><span
|
||
style='color:blue'>blk_size</span></u>[<u><span style='color:blue'>MAJOR</span></u>(<u><span
|
||
style='color:blue'>SWAP_DEV</span></u>)][<u><span style='color:blue'>MINOR</span></u>(<u><span
|
||
style='color:blue'>SWAP_DEV</span></u>)];</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US> if (!swap_size)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
|
||
lang=EN-US> if (swap_size <
|
||
100) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Swap device too small (%d
|
||
blocks)\n\r"</i>,swap_size);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>交换数据块总数转换成对应可交换页面总数。该值不能大于<span
|
||
lang=EN-US>SWAP_BITS</span>所能表示的页面数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>即交换页面总数不得大于<span
|
||
lang=EN-US> 32768</span>。<span lang=EN-US> </span>然后申请一页物理内存用来存放交换页面位映射数组</p>
|
||
|
||
<p class=a><span lang=EN-US> // swap_bitmap</span>，其中每<span
|
||
lang=EN-US>1</span>比特代表<span lang=EN-US>1</span>页交换页面。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US> swap_size >>=
|
||
2;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US> if (swap_size > <u><span
|
||
style='color:blue'>SWAP_BITS</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US>
|
||
swap_size = <u><span style='color:blue'>SWAP_BITS</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>swap_bitmap</span></u> = (char *) <u><span style='color:
|
||
blue'>get_free_page</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US> if (!<u><span
|
||
style='color:blue'>swap_bitmap</span></u>) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Unable to start
|
||
swapping: out of memory :-)\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // read_swap_page(nr, buffer)</span>被定义为<span
|
||
lang=EN-US>ll_rw_page(READ,SWAP_DEV,(nr),(buffer))</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参见<span lang=EN-US>linux/mm.h</span>文件第<span
|
||
lang=EN-US>11</span>行。这里把交换设备上的页面<span lang=EN-US>0</span>读到<span lang=EN-US>swap_bitmap</span>页面中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该页面是交换区管理页面。其中第<span
|
||
lang=EN-US>4086</span>字节开始处含有<span lang=EN-US>10</span>个字符的交换设备特征字</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>符串“<span lang=EN-US>SWAP-SPACE</span>”。若没有找到该特征字符串，则说明不是一个有效的交换设备。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>于是显示信息，释放刚申请的物理页面并退出函数。否则将特征字符串字节清零。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>read_swap_page</span></u>(0,<u><span style='color:blue'>swap_bitmap</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>strncmp</span></u>(<i>"SWAP-SPACE"</i>,<u><span
|
||
style='color:blue'>swap_bitmap</span></u>+4086,10)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Unable to find
|
||
swap-space signature\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>free_page</span></u>((long) <u><span
|
||
style='color:blue'>swap_bitmap</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>swap_bitmap</span></u> = <u><span style='color:
|
||
blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>memset</span></u>(<u><span style='color:blue'>swap_bitmap</span></u>+4086,0,10);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后检查读入的交换位映射图。应该<span
|
||
lang=EN-US>32768</span>个比特位全为<span lang=EN-US>0</span>，若位图中有置位的比特位<span
|
||
lang=EN-US>0</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则表示位图有问题，于是显示出错信息、释放位图占用的页面并退出函数。为了加快检查</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>速度，这里首先仅挑选查看位图中位<span
|
||
lang=EN-US>0</span>和最后一个交换页面对应的比特位，即<span lang=EN-US>swap_size</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>交换页面对应的比特位，以及随后到<span
|
||
lang=EN-US>SWAP_BITS</span>（<span lang=EN-US>32768</span>）比特位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US> for (i = 0 ; i <
|
||
<u><span style='color:blue'>SWAP_BITS</span></u> ; i++) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
|
||
lang=EN-US>
|
||
if (i == 1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
|
||
lang=EN-US>
|
||
i = swap_size;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
|
||
lang=EN-US>
|
||
if (bit(<u><span style='color:blue'>swap_bitmap</span></u>,i)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Bad swap-space
|
||
bit-map\n\r"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>free_page</span></u>((long) <u><span
|
||
style='color:blue'>swap_bitmap</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>swap_bitmap</span></u> = <u><span style='color:
|
||
blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后再仔细地检测位<span
|
||
lang=EN-US>1</span>到位<span lang=EN-US>swap_size</span>所有比特位是否为<span lang=EN-US>0</span>。若有不是<span
|
||
lang=EN-US>0</span>的比特位存在，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则表示位图有问题，于是释放位图占用的页面并退出函数。否则显示交换设备工作正常</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>以及交换页面数和交换空间总字节数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US> j = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US> for (i = 1 ; i <
|
||
swap_size ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US>
|
||
if (bit(<u><span style='color:blue'>swap_bitmap</span></u>,i))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US>
|
||
j++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US> if (!j) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>free_page</span></u>((long) <u><span
|
||
style='color:blue'>swap_bitmap</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>swap_bitmap</span></u> = <u><span style='color:
|
||
blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
|
||
lang=EN-US>
|
||
return;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>printk</span></u>(<i>"Swap device ok: %d pages (%d
|
||
bytes) swap-space\n\r"</i>,j,j*4096);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|