Copy paste in tmux session inside ssh

A simple hack for tmux copy-paste to work in all environments. It can be RDB, ssh, ssh in tmux, tmux in ssh, etc.,

Custom perf with custom kernel

perf setup

This post describes the necessary setup for Linux-perf. The setup machine is an Ubuntu VM. No custom kernel build.

Quick kernel upgrade with kexec

Upgrade kernel of a virtual machine in seconds. Normally kernel upgrade will require a reboot. As reboot will take minutes to complete, service downtime will be more. Here we'll see how upgrade kernel of a VM running Debian-9 in seconds.

perf kvm to profile vm_exit

Profiling VM_EXIT reasons with `perf kvm` tool

kexec - A travel to the purgatory

A story about how I fixed the boot delay in an ARM64 system. This article walks through Linux reboot / kexec code path, a bit of kexec-tools source and importantly how kexec-tools injects its code in your boot path.

Custom build kernel for Raspberry Pi

How to build your own customized kernel for Raspberry Pi using yocto.

64-bit Mainline kernel on Raspberry Pi 3

Raspberry Pi foundation maintains customized Linux kernel for Raspberry Pi devices. Cross-compiling vanilla kernel to Raspberry Pi is bit challenging. But its worth giving a try as we can test latest kernel on it. This article is a step-by-step guide to build vanilla kernel for Raspberry Pi 3. It explains necessary device-tree files and kernel configurations related to Raspberry Pi.