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Linux kernel 笔记 (63)——改变启动的kernel

Posted by nanxiao on 十月 25, 2016 in Linux kernel 笔记 |

原文在这里。 得到当前系统运行的kernel(系统为CentOS): # egrep ^menuentry / […]

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“Page out”和“swap out”

Posted by nanxiao on 十月 13, 2016 in 技术 |

下文摘自Linux performance and tuning guidelines: The pages […]

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Linux kernel 笔记 (62)——list_head

Posted by nanxiao on 五月 27, 2016 in Linux kernel 笔记 |

双向链表是Linux kernel中常用的数据结构,定义如下: struct list_head { stru […]

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Linux kernel 笔记 (61)——PID是0,1,2的进程

Posted by nanxiao on 五月 16, 2016 in Linux kernel 笔记 |

在Linux kernel中,0号进程是scheduler,1号进程是init/systemd(所有user […]

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Linux kernel 笔记 (60)——scheduling domain

Posted by nanxiao on 二月 28, 2016 in Linux kernel 笔记 |

在NUMA系统上,由于不同CPU直接访问本地内存和远端内存的时间相差很大,所以更好地调度算法就显得很重要。Li […]

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shmmax和shmall

Posted by nanxiao on 一月 15, 2016 in 技术 |

Linux kernel中针对shared memory有两个重要的配置项:shmmax和shmall: sh […]

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Linux kernel 笔记 (59)——Kconfig中的“depends on”和“select”

Posted by nanxiao on 十二月 1, 2015 in Linux kernel 笔记 |

在Kconfig文件中: config A depends on B select C 它的含义是:CONFI […]

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Linux kernel 笔记 (58)——ioctl

Posted by nanxiao on 十一月 30, 2015 in Linux kernel 笔记 |

ioctl系统调用的函数原型: int ioctl(int fd, unsigned long cmd, .. […]

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Linux kernel 笔记 (57)——hardware interrtupt不能访问userspace

Posted by nanxiao on 十一月 30, 2015 in Linux kernel 笔记 |

以下摘自plka: 系统调用(system call)可以访问userspace,而硬件中断(hardware […]

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Linux kernel 笔记 (56)——init进程

Posted by nanxiao on 十一月 30, 2015 in Linux kernel 笔记 |

以下摘自plka: Linux employs a hierarchical scheme in which […]

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