Part 3 Kernel Address Space JOS把32位线性地址虚拟空间划分成两个部分。其中用户环境(进程运行环境)通常占据低地址的那部分,叫用户地址空间。而操作系统内核总是占据高地址的部分,叫内核地址空间。这两个部分的分界线是定义在memlayout.h文件中的一个宏 ULIM。JO ...
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其他好文 时间:
2016-03-31 07:04:44
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394
What is ASLR? Address space layout randomization (ASLR) is an exploit mitigation technique that randomizes Stack address. Heap address. Shared library...
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系统相关 时间:
2016-03-19 21:15:04
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601
Typically, in each process, the virtual memory available to that process is called itsaddress space. Each process's address space is typically organiz...
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其他好文 时间:
2016-01-27 13:02:38
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Reserves, commits, or changes the state of a region of pages in the virtual address space of the calling process. Memory allocated by this function is...
1、机器级程序将存储器视为一个非常大的字节数组,称为虚拟存储器virtual memory。存储器的每个字节都由一个唯一的数字来标识,称为它的地址address,所有可能地址的集合称为虚拟地址空间virtual address space。这只是一个展现给机器的概念性映像。实际上的实现是将RAM.....
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2015-10-26 22:13:28
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Thus far, we have assumed that an address space is unrealistically small and fits into the physicalmemory. In fact, we have been assuming that every a...
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其他好文 时间:
2015-10-07 08:34:19
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170
Using paging as the core mechanism to support virtual memeory can lead to high performanceoverheads. By chopping the address space into small, fixed-s...
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其他好文 时间:
2015-10-02 01:28:25
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441
I've described the need for special handling of shared libraries while loading them into the process's address space in aprevious article. Briefly, wh...
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其他好文 时间:
2015-09-23 18:53:10
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297
extent的意思是“程度”,但是我还是搞不清楚要如何把“程度”和我理解的extent联系到一起。文件的偏移和page-cache的映射关系体现在address space 中的一颗基数树上;当基数树中的page真正落盘时,f2fs也有自己的block分配算法去存储这个page;当数据真正落盘之后,...
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其他好文 时间:
2015-09-15 21:51:00
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214
address_space 从哪里来这两天想弄清楚linux的内存分配,忽然看到了address_space,就想弄明白。整个内核就见到 address_space(1)和address_space(2)在这个文件里出现。include/linux/compiler.h: # define __us...
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其他好文 时间:
2015-09-04 07:28:25
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258