Kernel | Cool code to run with Linux Kernel

by petersenna C Version: Current License: No License

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kandi X-RAY | Kernel Summary

Kernel is a C library. Kernel has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Cool code to run with Linux Kernel.

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Support

Kernel has a low active ecosystem.

It has 13 star(s) with 10 fork(s). There are 2 watchers for this library.

It had no major release in the last 6 months.

Kernel has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of Kernel is current.

Quality

Kernel has no bugs reported.

Security

Kernel has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

Kernel does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

Kernel releases are not available. You will need to build from source code and install.

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Kernel Key Features

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Kernel Examples and Code Snippets

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Community Discussions

Trending Discussions on Kernel

How do I cast a float pointer to a uint8_t pointer in Metal Shader Language?

What is the Sobel operator?

Win 10 WSL won't set default version to 2 with Ubuntu

Is it necessary to use synchronization between two calls to CUDA kernels?

Problem with FULLY_CONNECTED op in TF Lite

Push to bpf map stack type

Error: "Driver [default] not supported." in laravel 8

Adonis 5 node deprecated warning when using migration

Why Kubernetes control planes (masters) must be linux?

DPDK Compilation fails inside WSL2 Docker Desktop's containers

QUESTION

How do I cast a float pointer to a uint8_t pointer in Metal Shader Language?

Asked 2021-Jun-15 at 21:02

I am trying to write the following C code in Metal Shading Language inside of a kernel void function:

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ANSWER

Answered 2021-Jun-15 at 21:02

Don't know about metal specifically, but in ordinary C, you'd want to put f and byteArray inside a union

Here's some sample code:

Source https://stackoverflow.com/questions/67990565

QUESTION

What is the Sobel operator?

Asked 2021-Jun-15 at 18:13

I tried 5 different implementations of the Sobel operator in Python, one of which I implemented myself, and the results are radically different.

My questions is similar to this one, but there are still differences I don't understand with the other implementations.

Is there any agreed on definition of the Sobel operator, and is it always synonymous to "image gradient"?

Even the definition of the Sobel kernel is different from source to source, according to Wikipedia it is [[1, 0, -1],[2, 0, -2],[1, 0, -1]], but according to other sources it is [[-1, 0, 1],[-2, 0, 2],[-1, 0, 1]].

Here is my code where I tried the different techniques:

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ANSWER

Answered 2021-Jun-15 at 14:22

according to wikipedia it's [[1, 0, -1],[2, 0, -2],[1, 0, 1]] but according to other sources it's [[-1, 0, 1],[-2, 0, 2],[-1, 0, 1]]

Both are used for detecting vertical edges. Difference here is how these kernels mark "left" and "right" edges.

For simplicity sake lets consider 1D example, and let array be

[0, 0, 255, 255, 255]

then if we calculate using padding then

kernel [2, 0, -2] gives [0, -510, -510, 0, 0]
kernel [-2, 0, 2] gives [0, 510, 510, 0, 0]

As you can see abrupt increase in value was marked with negative values by first kernel and positive values by second. Note that is is relevant only if you need to discriminate left vs right edges, when you want just to find vertical edges, you might use any of these 2 aboves and then get absolute value.

Source https://stackoverflow.com/questions/67987368

QUESTION

Win 10 WSL won't set default version to 2 with Ubuntu

Asked 2021-Jun-15 at 15:47

I have Windows 10 Pro Version 21H1 Build 19043.1052. I have followed the guide in https://docs.microsoft.com/en-gb/windows/wsl/install-win10#step-4---download-the-linux-kernel-update-package and in Win 10 WSL won't set default 2 to get wsl. And I want to upgrade to version 2. I installed the regular Ubuntu from the Microsoft app store. And I did wsl --setdefault Ubuntu followed by wsl --set-default-version 2 and it only gave me For information on key differences with WSL 2 please visit https://aka.ms/wsl2. But wsl -l -v was still showing VERSION 1.

So I went an installed Ubuntu-20.04 LTS and now that version is showing VERSION 2 but not the regular Ubuntu one.

How can I get them both to version 2?

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ANSWER

Answered 2021-Jun-15 at 15:47

When you do --set-default-version, you're setting the version for future distributions that you install. That doesn't convert or change any current distros you have installed. So for your existing Ubuntu distro that is version 1, you should use the wsl --set-version command to convert it to version 2 or revert back to version 1.

Source: https://docs.microsoft.com/en-us/windows/wsl/install-win10

Source https://stackoverflow.com/questions/67974894

QUESTION

Is it necessary to use synchronization between two calls to CUDA kernels?

Asked 2021-Jun-15 at 13:26

So far I have written programs where a kernel is called only once in the program

So I have a kernel

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ANSWER

Answered 2021-Jun-15 at 12:37

Additional synchronization would not be necessary in this case for at least 2 reasons.

cudaMemcpy is a synchronizing call already. It blocks the CPU thread and waits until all previous CUDA activity issued to that device is complete, before it allows the data transfer to begin. Once the data transfer is complete, the CPU thread is allowed to proceed.
CUDA activity issued to a single device will not overlap in any way unless using CUDA streams. You are not using streams. Therefore even asynchronous work issued to the device will execute in issue order. Item A and B issued to the device in that order will not overlap with each other. Item A will complete before item B is allowed to begin. This is a principal CUDA streams semantic point.

Source https://stackoverflow.com/questions/67985805

QUESTION

Problem with FULLY_CONNECTED op in TF Lite

Asked 2021-Jun-15 at 13:22

I'd like to run a simple neural network model which uses Keras on a Rasperry microcontroller. I get a problem when I use a layer. The code is defined like this:

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ANSWER

Answered 2021-May-25 at 01:08

I had the same problem, man. I want to transplant tflite to the development board of CEVA. There is no problem in compiling. In the process of running, there is also an error in AddBuiltin(full_connect). At present, the only possible situation I guess is that some devices can not support tflite.

Source https://stackoverflow.com/questions/67677228

QUESTION

Push to bpf map stack type

Asked 2021-Jun-15 at 07:42

I'm looking for a method to send data from userspace to bpf program in Linux. I use libbpf in userspace and bpf_helpers in bpf program in kernel. I now can send data from kernel to user by ringbuf and other. but I want to use stack and queue for this. I can't find function that handles queue or stack in userspace and I still confused. My question is: how can I send data from userspace to bpf program using stack or queue and get it in my bpf program, as what we do in bcc with bpf['queue'].push in userspace for example and queue.peek(&val); in bpf program.

thank you for any help!

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ANSWER

Answered 2021-Jun-15 at 07:42

You should use the usual bpf_map_update_elem and bpf_map_lookup_elem functions for BPF_MAP_TYPE_QUEUE and BPF_MAP_TYPE_STACK maps.

You can find several examples in the kernel source code:

Source https://stackoverflow.com/questions/67980291

QUESTION

Error: "Driver [default] not supported." in laravel 8

Asked 2021-Jun-14 at 23:09

I don't really know where the error is, for me, it's still a mystery. But I'm using Laravel 8 to produce a project, it was working perfectly and randomly started to return this error and all projects started to return this error too. I believe it's something with Redis, as I'm using it to store the system cache. When I go to access my endpoint in postman it returns the following error:

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ANSWER

Answered 2021-Jun-12 at 01:50

Your problem is that you have set SESSION_CONNECTION=session, but your SESSION_DRIVER=default, so you have to use SESSION_DRIVER=database in your .env. See the config/session.php:

Source https://stackoverflow.com/questions/67944667

QUESTION

Adonis 5 node deprecated warning when using migration

Asked 2021-Jun-14 at 22:07

This has recently started poping up in commandline....anyone know whats going on, Im unsure why the new package in node_modules is not compatable with node v14.16. I tried using older version of node (docs state min version for adonis 5 is version 12), although this produces a syntax error.

This container.with() is deprecated warning shows whenever using the node ace commands. How can I fix these?

Node version 14.16.0:

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ANSWER

Answered 2021-Mar-25 at 14:28

@poppinss\utils\build\src\Helpers\string.js:241 uses optional chaining which is only supported from Node.js 14

Using Node.js v14.15 will fix the problem. I personally had this problem with Node.js 12 and Node.js 14.16. I switched to Node.js v14.15.1 and it worked instantly.

Source https://stackoverflow.com/questions/66769363

QUESTION

Why Kubernetes control planes (masters) must be linux?

Asked 2021-Jun-13 at 20:06

I am digging deeper to kubernetes architecture, in all Kubernetes clusters on-premises/Cloud the master nodes a.k.a control planes needs to be Linux kernels but I can't find why?

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ANSWER

Answered 2021-Jun-13 at 19:22

There isn't really a good reason other than we don't bother testing the control plane on Windows. In theory it's all just Go daemons that should compile fine on Windows but you would be on your own if any problems arise.

Source https://stackoverflow.com/questions/67961188

QUESTION

DPDK Compilation fails inside WSL2 Docker Desktop's containers

Asked 2021-Jun-13 at 14:09

I can't compile DPDK inside a docker container, running under WSL2 as VM (and windows 10 as the host machine).

Background

Trying to compile DPDK locally inside a wsl-container some DPDK lib that used to be built on remote native linux machines.

The Dockerfile running the compilation had installed kernel headers, GNU toolchain and other various dependencies. The distribution is CentOS7.

The containers are managed by Docker Desktop

Versions are useless information here.

The Problem

Similar problems across DPDK versions. In DPDK 20.11, using the meason build-system, the file kernel/linux/meason.build:

../kernel/linux/meson.build:23:1: ERROR: Problem encountered: Cannot compile kernel modules as requested - are kernel headers installed?

If I compile different DPDK versions of DPDK or building using other build-systems (makefiles), I am getting variants of the same error.

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ANSWER

Answered 2021-Jun-11 at 19:36

Inside your /lib/modules has no entry with WSL2 "uname -r" output

Although WSL2 has /lib/modules/5.4.72-microsoft-standard-WSL2 (as a softlink), this soft link does not appear in the container.

The solution is adding this line to the Dockerfile*:

Source https://stackoverflow.com/questions/67942680

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

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Install Kernel

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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