Kernel & System Internals

Notes on the Linux kernel, crash analysis, kdump, performance tuning, and sysctl.

• !/bin/bash

• Add audit rule to track modifications to HugePages settings

• Add audit rule to track modifications to HugePages settings

• Adding Selinux=0 Into The Grub Kernel Command Line

• Any kernel gearheads? irq affinity question?

• Approaching the kernel year-2038 end game

• Basics Of Crash Analysis Guide

• Can anyone please explain about ‘Function call interrupts’ entry in /proc/interrupts?

• Check Kernel Driver For Gpu Command

• Check The Major And Minor Faults In The Sar Report

• Command To Clear Out Dmesg Logs

• Command To Reserve Hugepages For Dpdk Use

• Control Groups V2 Kernel Docs

• Difference Between dracut and dracut-ng Repositories

• Dis Command In The Crash Utility Helps To Disassem

• Dmesg T

• Fedora-33 HOST / Fedora-33 LXC GUEST :: WARN[0000] The cgroupv2 manager is set to systemd but there is no systemd user session available

• File name

• Good Command For Reloading The Kernel When Modules

• Good Example To Use Awk In An Strace

• Good Steps to Check if Certain Patches are Available in a Particular Kernel

• Good Way To Check For Oom Killer Messages In Dmesg

• How Create A Vmcore Dump

• How Find System Information From The Crash Utility

• How Kernel Entropy Works

• How List All Kernel Parameters

• How Show Contents Of Initramfs Image

• How To Build Crash With Lzo Support

• How To Check If An Iso Is Uefi Or Legacy Bios Boot

• How To Check If Kernel Parameters Have Been Added

• How To Download The Kernel In Its Entirety And Go

• How To Permanently Set Kernel Parameters

• How To Set Kernel.Sched Rt Runtime Us= 1 In The Ke

• How do I remove crashkernel from cmdline?

• How do you view Grub command line options

• How to Check for the Currently Installed Kernels with grubby

• How to Check the Default Kernel in Use with Grubby

• How to Collect Logs of a Kernel Crash that Happens Very Early in the Boot Process

• How to Install sysfsutils in Linux

• How to List the Tainted Modules Using the crash Utility

• How to Spread a SoftIRQ Load Across Multiple CPUs

• How to Unpress an initramfs Image

• If Receive Cannot Build Against Kernel Version 6.1

• If Someone Refers To Kernel Headers

• If Unable to Connect Via ssh to a FIPS System After Updating the Kernel

• If You Observe a GRUB Issue Surrounding GRUB Configuration was Not Updated

• If a Kernel Panic Occurs Due to a BMC Restart Analysis

• Initramfs Explanation

• Insight into the RT Kernel Changelog

• Introducing kpatch - Dynamic Kernel Patching

• Kdump And Introduction To Vmcore Analysis By Red H

• Kernel & System Internals

• Kernel 6.13 Release Information

• Kernel Hardening

• Kernel Newbies is a Good Website for Searching for Upstream Commits

• Kernel drop_caches value

• Kernel panic - not syncing: hung_task: blocked tasks

• Kernel parameters

• Kernel-space and User-space Incompatibility in Linux

• Linux Kernel Tuning - vfs_cache_pressure

• Linux Kernel panic issue: How to fix hung_task_timeout_secs and blocked for more than 120 seconds problem

• NUMA Memory Policy

• NUMA scheduling progress

• Need 32-bit Linux to run past 2038? When version 5.6 of the kernel pops, you’re in for a treat

• Netfilter Conntrack Sysfs variables

• Open and read the SAR file

• Print a well known symbol in hex

• Priority Inheritance in the RT Kernel

• Reasoning Why the RESF Doesn’t Build Some Kernels Inbetween and Only Builds the Latest Kernel

• Reasons Why GRUB Does Not Regenerate if the Packages are Updated

• Regarding the transparent_hugepage Kernel Option

• Sar Meaning System Activity Reporter

• Scaling in the Linux Networking Stack

• SoftNetStats - file /proc/net/softnet_stat

• Strace Numbers Are Shown In Seconds

• Super Block - Kernel Docs

• The Linux Kernel Crash Book

• The Sym Command In Crash

• To Only See Linux Kernel Logs, Run

• Today I Learned - kernel.modules_disabled

• Transparent Hugepage Support

• Tuning A Real Time Kernel

• Tuning IRQ Balancing

• Understanding the iommu Linux grub File Configuration

• Use Strings Command To Check The Vmcore File

• Useful Dmesg Commands

• Useful Example Patch for Cgroup Crashes

• Useful Way To Troubleshoot Crash (Alongside Copilo

• Useful strace Command for Capturing the Output of a File

• WARN[0000] The cgroupv2 manager is set to systemd but there is no systemd user session available #12983

• What Is /boot/efi/EFI/BOOT/fbx64.efi?

• What is Rescheduling interrupts (RES)? What causes it? How is it handled in Linux kernel?

• What is the grub2-pc Package?

• What is the kernel parameter net.ipv4.conf.all.log_martians for?

• What’s the best way to trigger a kernel panic?

• When Tuning Kernel Parameters, If There Are 2 Or M

• Why Dates Do Not Match up in a Kernel Source Tree

• [NUMA] Display and modify the memory policy of a process through /proc//numa_policy

• [patch 00/33] genirq, PCI/MSI: Support for per device MSI and PCI/IMS - Part 3 implementation

• error: cannot find cgroup plugin for cgroup/v2

• grubby(8) - Linux man page

• kdump.conf(5) - Linux man page

• ksoftirq Discussion on the Nvidia Forums

• race? Failed to retrieve cgroup stats: open …/user.slice/sha.scope/memory.stats and pids.current: ENOENT #23789

• sysctl Arch Wiki

• 📁 memory.stat

• 🔍 What dis -l Does in crash