Linux-0.11内核源码分析系列：内存管理copy_page_tables()函数分析

linpeng1577

于 2014-11-24 11:13:03 发布

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分类专栏： Linux内核文章标签： linux 内核内存管理

本文链接：https://blog.youkuaiyun.com/linpeng12358/article/details/41441993

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本文是Linux-0.11内核源码分析系列的一部分，主要探讨了内存管理中的copy_page_tables()函数。这个函数用于复制线性地址范围内的页表，它在fork过程中被调用，遵循4M对齐原则。文章详细解释了函数的工作原理，包括检查页表对齐、分配页表、复制页表项以及处理不同内存区域的细节。

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 *Author  : DavidLin 
 *Date    : 2014-11-22pm 
 *Email   : linpeng1577@163.com or linpeng1577@gmail.com 
 *world   : the city of SZ, in China 
 *Ver     : 000.000.001 
 *history :     editor      time            do 
 *          1)LinPeng       2014-11-22      created this file! 
 *          2) 
 */ 
/*
 *  Well, here is one of the most complicated functions in mm. It
 * copies a range of linerar addresses by copying only the pages.
 * Let's hope this is bug-free, 'cause this one I don't want to debug :-)
 *
 * Note! We don't copy just any chunks of memory - addresses have to
 * be divisible by 4Mb (one page-directory entry), as this makes the
 * function easier. It's used only by fork anyway.
 *
 * NOTE 2!! When from==0 we are copying kernel space for the first
 * fork(). Then we DONT want to copy a full page-directory entry, as
 * that would lead to some serious memory waste - we just copy the
 * first 160 page

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