christianparpart

Synchronized Output

Synchronized output is merely implementing the feature as inspired by iTerm2 synchronized output, except that it's not using the rare DCS but rather the well known SM ? and RM ?. iTerm2 has now also adopted to use the new syntax instead of using DCS.

Semantics

When rendering the screen of the terminal, the Emulator usually iterates through each visible grid cell and renders its current state. With applications updating the screen a at higher frequency this can cause tearing.

This mode attempts to mitigate that.

benesch

sudo apt-get install -qy binutils-aarch64-linux-gnu gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
export CMAKE_SYSTEM_NAME=Linux
export TARGET=aarch64-linux-gnu
export TARGET_AR=aarch64-linux-gnu-ar
export TARGET_CC=aarch64-linux-gnu-gcc
export TARGET_CXX=aarch64-linux-gnu-g++
export TARGET_RANLIB=aarch64-linux-gnu-ranlib
export TARGET_CPP=aarch64-linux-gnu-cpp
export TARGET_LD=aarch64-linux-gnu-ld
export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=$TARGET_CC

simias

.set SCTRL_M,		(1 << 0)	/* MMU enable */
.set SCTRL_A,		(1 << 1)	/* Strict alignment enable */
.set SCTRL_C,		(1 << 2)	/* Data cache enable */
.set SCTRL_Z,		(1 << 11)	/* Program flow prediction enable */
.set SCTRL_I,		(1 << 12)	/* Instruction cache enable */
.set SCTRL_V,		(1 << 13)	/* Vectors bit */

.section ".text.vectors", "x"
.globl _vectors
_vectors:

zserge

#define _GNU_SOURCE
#include <asm/bootparam.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/kvm.h>
#include <linux/kvm_para.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

nrdmn

vsock notes

about vsocks

Vsocks are a means of providing socket communication (either stream or datagram) directly between VMs and their host operating system. The host and each VM have a 32 bit CID (Context IDentifier) and may connect or bind to a 32 bit port number. Ports < 1024 are privileged ports.

• Vsock communication between VMs does not seem to work.
• Only one vsock device per VM is supported.

dalehamel

#include <stdio.h>
#include <sys/inotify.h>
#include <sys/time.h>

#include <sys/epoll.h>
#include <errno.h>

#include <linux/memfd.h>
#include <sys/mman.h>
#include <sys/syscall.h>

romanblanco

• https://golb.hplar.ch/2019/01/expose-server-vpn.html
• https://blog.stigok.com/2018/10/08/wireguard-vpn-server-on-centos-7.html
• https://www.wireguard.com/install/
• https://kb.vpsfree.cz/informace/openvz
• https://kb.vpsfree.cz/navody/vps/kvm#kvm_na_centos_7
• http://linux.dell.com/files/whitepapers/KVM_Virtualization_in_RHEL_7_Made_Easy.pdf

---

KVM on OpenVZ

naugtur

%GetOptimizationStatus return a set of bitwise flags instead of a single value, to access the value, you need to take the binary representation of the returned value. Now, for example, if 65 is returned, the binary representation is the following:

(65).toString(2).padStart(12, '0');
// 000001000001

Each binary digit acts as a boolean with the following meaning:

burnpiro

Install V8 on Linux

Requirements

• git

Installation

depot_tools

sameo

Measuring Firecracker boot time

Firecracker comes with an internal way of logging a timestamp that measures time elapsed between the very start of the guest VM and the moment a specific IO port has been written to.

That allows for marking specific moment along the boot process by having code writing to this port.

Artifacts build

Here we're going to measure the time it takes for a Firecracker guest VM to reach userspace. To do so we're going to build 3 components: