包括一些最常用的核心数据： 、进程表项（Process Table Entry） 进程标识符 PID、用户标识符 UID、进程状态、事件描述符、进程和 U 区在内存或外 存的地址、软中断信号、计时域、进程的大小、偏...
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To send a signal to a process, the kernel sets a bit in the signal field of the process table entry, corresponding to the type of signal received.
为了向进程发送一个信号，内核在进程表条目的信号域中设置一个位，对应于收到的信号的类型。
However, before they can be swapped out, every single process mapping that page must be found so that the page-table entry for the page in that process can be updated.
不过，在它们可以被交换出去之前，必须找到映射那个页的每一个进程，这样那些进程中相应页的页表条目才可以被更新。
But since a typical entry in the address translation table only takes about 160 bytes, a router with 4 MB of DRAM could theoretically process 26,214 simultaneous translations!
但是由于通常的地址转换条目是160字节，而一台有4 M b大小dram的路由器理论上可以同时执行26214个地址转换！
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