kernel

内核的命令行参数

泄露秘密 提交于 2020-01-11 18:45:36
内核将内核命令行的参数解析为“-‌-”。如果内核不识别参数,也不包含“.”,那么参数会被传递给init:带“=”的参数会被传递给init环境,其他会作为命令行参数传递给init。“ -‌- ”之后的所有内容都作为参数被传递给init。 可以通过两种方式指定模块参数:通过带有模块名称前缀的内核命令行,或通过modprobe,例如: (kernel command line) usbcore.blinkenlights=1 (modprobe command line) modprobe usbcore blinkenlights=1 内置在内核中的模块的参数需要在内核命令行上明确规定。modprobe查看内核命令行(/proc/cmdline)并在加载模块时收集模块参数,因此内核命令行也可用于可加载模块。 参数名称中的连字符(破折号)和下划线相同,因此: log_buf_len=1M print-fatal-signals=1 也可以输入为: log-buf-len=1M print_fatal_signals=1 双引号可用于保护值中的空格,例如: param="spaces in here" CPU列表 一些内核参数将CPU列表作为值,例如isolcpus,nohz_full,irqaffinity,rcu_nocbs。该列表的格式为: <cpu number>,…,<cpu

What is the difference between kernel threads and user threads?

女生的网名这么多〃 提交于 2020-01-11 18:33:28
问题 What is the difference between kernel threads and user threads? Is it that kernel thread are scheduled and executed in kernel mode? What are techniques used for creating kernel threads? Is it that user thread is scheduled, executed in user mode? Is it that Kernel does not participate in executing/scheduling user threads? When interrupts occur in executing user thread then who handles it? Whenever, thread is created a TCB is created for each. now in case of user level threads Is it that this

What is the difference between kernel threads and user threads?

霸气de小男生 提交于 2020-01-11 18:33:27
问题 What is the difference between kernel threads and user threads? Is it that kernel thread are scheduled and executed in kernel mode? What are techniques used for creating kernel threads? Is it that user thread is scheduled, executed in user mode? Is it that Kernel does not participate in executing/scheduling user threads? When interrupts occur in executing user thread then who handles it? Whenever, thread is created a TCB is created for each. now in case of user level threads Is it that this

installing kernel source code in Redhat or centos, kernel headers install

不羁的心 提交于 2020-01-11 17:28:24
安装内核源码步骤installing kernel source code in Redhat or centos, kernel headers install 2011-03-10 15:15 Both CentOS and RHEL5 includes following packages: Kernel-headers : It includes the C header files that specify the interface between the Linux kernel and userspace libraries and programs. The header files define structures and constants that are needed for building most standard programs and are also needed for rebuilding the glibc package. kernel-devel : This package provides kernel headers and makefiles sufficient to build modules against the kernel package. c) Actual kernel source code : You

PermissionError while starting the kernel in Spyder's IPython console

烂漫一生 提交于 2020-01-11 13:20:11
问题 When I launch spyder , this error appears : Traceback (most recent call last): File "C:\ProgramData\Anaconda3\lib\site‑packages\spyder\plugins\ipythonconsole.py", line 1572, in create_kernel_manager_and_kernel_client kernel_manager.start_kernel(stderr=stderr_handle) File "C:\ProgramData\Anaconda3\lib\site‑packages\jupyter_client\manager.py", line 240, in start_kernel self.write_connection_file() File "C:\ProgramData\Anaconda3\lib\site‑packages\jupyter_client\connect.py", line 547, in write

什么是SVM

房东的猫 提交于 2020-01-11 08:24:34
一、什么是SVM SVM主要针对小样本数据进行学习、分类和预测(有时也叫回归)的一种方法,有很好的泛化能力 二、SVM原理 举个例子: 好吧,故事是这样子的: 在很久以前的情人节,大侠要去救他的爱人,但魔鬼和他玩了一个游戏。 魔鬼在桌子上似乎有规律放了两种颜色的球,说:“你用一根棍分开它们?要求:尽量在放更多球之后,仍然适用。” 增加难度 然后,在SVM 工具箱中有另一个更加重要的 trick。 魔鬼看到大侠已经学会了一个trick,于是魔鬼给了大侠一个新的挑战 现在,大侠没有棍可以很好帮他分开两种球了,现在怎么办呢?当然像所有武侠片中一样大侠桌子一拍,球飞到空中。然后,凭借大侠的轻功,大侠抓起一张纸,插到了两种球的中间 再后来 无聊的大人们,把这些球叫做 「data」,把棍子 叫做 「classifier」, 最大间隙trick 叫做「optimization最优化」, 拍桌子叫做「kernelling内核」, 那张纸叫做「hyperplane超平面」 三、SVM内核选择 Linear核:主要用于线性可分的情形。参数少,速度快,适用于一般数据 RBF核:主要用于线性不可分的情形。参数多,分类结果非常依赖于参数。 poly:参数较多,在另外两种都不适用的时候选择 就拟合程度来讲,linear在线性可分的情况下和rbf想过差不多,在线性不可分的情况下rbf明显优于linear

Multiple kernels in Enthought Canopy

谁都会走 提交于 2020-01-11 06:32:33
问题 I previously worked with the EPD Python distribution using its Qt-console, where one of the most useful features was easily having multiple kernels in multiple tabs, when doing several calculations simultaneously. I recently got the "new" Enthought Canopy, which somehow tries to emulate MatLab, which might not be bad perse. Here comes the problem: How do I get multiple tabs with separated kernels with Canopy? For completeness, I am running Canopy 1.1.0 on Ubuntu-Gnome 13.04. 回答1: The Canopy

Having trouble finding the method __kernel_vsyscall within the Linux kernel

巧了我就是萌 提交于 2020-01-11 04:05:40
问题 I am looking for the __kernel_vsyscall method within the linux kernel which is used to make system calls. I would like to observe its code to learn more about it, but my grep searches cannot seem to pick it out and I can't find its location on the internet. Can anyone point to me exactly where it is located? And can it be manipulated? Thanks for any help! 回答1: Assuming your current directory is at the head of the linux kernel source, here are the locations of the files that define the _

jupyter notebook切换kernel

江枫思渺然 提交于 2020-01-11 03:39:23
文章目录 安装 删除 安装 确保安装了ipykernel python3 -m pip install ipykernel python3 -m ipykernel install --user // 默认更改python3 然后切换到目标环境,若没有先建立 conda create -n py36-test python = 3.6 source activate py36-test python -m ipykernel install --user --name = py36-test //关键 source deactivate 可以查看json文件确认是否安装正确 Installed kernelspec myenv in /home/user/.local/share/jupyter/kernels/myenv 删除 查看kernel列表 jupyter kernelspec list 删除kernel jupyter kernelspec uninstall myenv 来源: CSDN 作者: mohhao 链接: https://blog.csdn.net/mohhao/article/details/103882175

Android离Linux越来越遥远了,Google的Android真的是开源的吗?

爷,独闯天下 提交于 2020-01-10 18:24:13
Linux简介(先简单的介绍一下Linux) Linux是一类Unix计算机操作系统的统称。Linux操作系统的内核的名字也是“Linux”。Linux操作系统也是自由软件和开放源代码发展中最著名的例子。严格来讲,Linux这个词本身只表示Linux内核,但在实际上人们已经习惯了用Linux来形容整个基于Linux内核,并且使用GNU 工程各种工具和数据库的操作系统。 1994年3月,Linux1.0发布 代码量17万行,当时是按照完全自由免费的协议发布,完全自由免费的协议代表着自由,开放,任何人都可以修改它,加上自己的代码,但是这样无疑让Linux很难以商用而且不利于传播(这里很难说,如果不是商业的驱动,完全的自由开放可能就不会有今天的Linux了)。于是随后正式采用GPL协议。GPL协议是一种很强硬的开源协议,给软件提供版权保护的同时它给你复制,发布和修改这些软件的法律许可。 如果你修改这些代码并申请专利,那么请看:自由软件的再发布者以个人名义获得专利许可证。事实上,将软件变为私有。为防止这一点,我们必须明确:任何专利必须以允许每个人自由使用为前提,否则就不准许有专利。 显然,Android是一个商业应用,这样的协议肯定不符合Google的利益,等一下我会介绍Google是如何对抗这种协议的。 1995年1月,RedHat(小红帽)诞生 1995年1月,Bob