johnstultz-work

Perfetto for upstream kernel development

Perfetto is super useful for understanding interactions between the kernel and applications. Outside of Android and ChromeOS, though it's use isn't as common. This doc tries to provide a basic walk through to get started using perfetto for upstream kernel development with classic linux distros, potentially running under qemu.

Install perfetto

Grab the latest linux- tarball: https://github.com/google/perfetto/releases

Often the tests I’m tracing need to run as root, so because of this, I copied the binaries in the tarball to /usr/local/bin/ and chmod +x the binaries to make

jimmychu0807

use std::str;

fn main() {
  // -- FROM: vec of chars --
  let src1: Vec<char> = vec!['j','{','"','i','m','m','y','"','}'];
  // to String
  let string1: String = src1.iter().collect::<String>();
  // to str
  let str1: &str = &src1.iter().collect::<String>();
  // to vec of byte

ncmiller

This is the process I followed on my Fedora 23 host machine to build a small/minimal vanilla Linux kernel and test in Qemu (based on this blog post). This will provide a safe sandbox in which to test kernel changes, and is generally faster than developing natively on the host machine. Qemu will boot the kernel image directly in the emulated system.

Install required build tools on host machine

sudo dnf install ncurses-devel kernel-devel kernel-headers gcc gcc-c++ git qemu openssl-devel glibc-static

Prepare a working space for kernel development

bennofs

{}: # nix-env expects a function

let 
  # Get nixpkgs (in configuration.nix, use pkgs for this, but this file is standalone
  # to test it easier so we have to manually import nixpkgs)
  pkgs = import <nixpkgs> {};

  # First, get the haskell packages from nixpkgs. In configuration.nix, you
  # can use pkgs.haskellngPackages for this of course.
  haskellngPackages = pkgs.haskellngPackages;

tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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bitemyapp

The Learning Haskell guide has been moved to a git repo to enable outside contribution

Find it here: https://github.com/bitemyapp/learnhaskell

yanatan16

# Makefile for a go project
#
# Author: Jon Eisen
# 	site: joneisen.me
# 	
# Targets:
# 	all: Builds the code
# 	build: Builds the code
# 	fmt: Formats the source files
# 	clean: cleans the code