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So that Linux can manage the processes in the system, each process is represented by a task_struct data structure (task and process are terms which Li 阅读全文
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reference : https://github.com/beagleboard/beaglebone-black/wiki/System-Reference-Manual https://beagleboard.org/getting-started https://github.com/be 阅读全文
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git commit steps:if you are a new git user , you may need to set # git config --global user.email "panzidong@com"# git config --global user.name "panz 阅读全文
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vmuser@vmuser-VirtualBox:~$ sudo useradd -m hadoop -s /bin/bash[sudo] vmuser 的密码： vmuser@vmuser-VirtualBox:~$ sudo passwd hadoop输入新的 UNIX 密码： 重新输入新的 U 阅读全文
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The name swap daemon is a bit of a misnomer as the daemon does more than just swap modified pages out to the swap file. Its task is to keep the memory 阅读全文
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All of the physical pages in the system are described by the mem_map data structure which is a list of mem_map_t typedef struct page { // these must b 阅读全文
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To translate a virtual address into a physical one, the CPU must take the contents of each level field, convert it into an offset into the physical pa 阅读全文
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example 1: 特理地址和虚拟地址一致 Physical addressing mode requires no page tables and the CPU does not attempt to perform any address translations in this mode. 阅读全文
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Page Cache This is used to speed up access to images and data on disk. As pages are read into memory from disk they are cached in the page cache. If t 阅读全文
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Page Table Entry The access control information is held in the PTE and is CPU specific; figure bit fields have the following meanings: The following t 阅读全文