add flake, copytoram boot image, wip pxe

nix/common.nix

@@ -0,0 +1,100 @@
+# Common NixOS configuration shared between ISO and netboot
+{ config, lib, pkgs, workshopSrc, ... }:
+
+let
+	workshopPackages = import ./packages.nix {
+		inherit pkgs;
+		kernelPackages = config.boot.kernelPackages;
+	};
+in
+{
+	# System identification
+	system.stateVersion = "24.11";
+
+	# Use a recent stable kernel
+	boot.kernelPackages = pkgs.linuxPackages_6_12;
+
+	# Set perf permissions for non-root users
+	boot.kernel.sysctl = {
+		"kernel.perf_event_paranoid" = 1;
+		"kernel.kptr_restrict" = 0;  # Allow reading kernel symbols
+	};
+
+	# Workshop packages
+	environment.systemPackages = workshopPackages ++ (with pkgs; [
+		# Additional GUI utilities
+		firefox  # for viewing flamegraphs
+		xfce4-terminal
+	]);
+
+	# Create workshop user with auto-login
+	users.users.workshop = {
+		isNormalUser = true;
+		description = "Workshop User";
+		extraGroups = [ "wheel" "video" "audio" "networkmanager" ];
+		initialPassword = "workshop";
+		home = "/home/workshop";
+	};
+
+	# Auto-login to workshop user
+	services.displayManager.autoLogin = {
+		enable = true;
+		user = "workshop";
+	};
+
+	# Allow passwordless sudo for workshop user
+	security.sudo.wheelNeedsPassword = false;
+
+	# XFCE desktop environment
+	services.xserver.desktopManager.xfce.enable = true;
+	services.displayManager.defaultSession = "xfce";
+
+	# Embed workshop materials into home directory
+	system.activationScripts.workshopMaterials = ''
+		mkdir -p /home/workshop/perf-workshop
+		cp -rT ${workshopSrc} /home/workshop/perf-workshop
+		chmod -R u+w /home/workshop/perf-workshop
+		chown -R workshop:users /home/workshop/perf-workshop
+	'';
+
+	# Desktop shortcut for workshop
+	environment.etc."skel/Desktop/Workshop.desktop".text = ''
+		[Desktop Entry]
+		Type=Application
+		Name=Performance Workshop
+		Comment=Open terminal in workshop directory
+		Exec=xfce4-terminal --working-directory=/home/workshop/perf-workshop
+		Icon=utilities-terminal
+		Terminal=false
+		Categories=Development;
+	'';
+
+	# Copy desktop shortcut for workshop user
+	system.activationScripts.workshopDesktop = ''
+		mkdir -p /home/workshop/Desktop
+		cp /etc/skel/Desktop/Workshop.desktop /home/workshop/Desktop/
+		chown -R workshop:users /home/workshop/Desktop
+		chmod +x /home/workshop/Desktop/Workshop.desktop
+	'';
+
+	# Networking
+	networking = {
+		hostName = "perf-workshop";
+		networkmanager.enable = true;
+	};
+
+	# Enable SSH for remote access (useful for debugging)
+	services.openssh = {
+		enable = true;
+		settings = {
+			PermitRootLogin = "no";
+			PasswordAuthentication = true;
+		};
+	};
+
+	# Timezone (can be changed by user)
+	time.timeZone = "Asia/Kolkata";
+
+	# Locale
+	i18n.defaultLocale = "en_US.UTF-8";
+}

nix/iso.nix

@@ -0,0 +1,17 @@
+# NixOS ISO-specific configuration
+{ config, lib, pkgs, workshopSrc, ... }:
+
+{
+	imports = [ ./common.nix ];
+
+	# Enable copytoram - boots from USB, runs entirely from RAM
+	boot.kernelParams = [ "copytoram" ];
+
+	# ISO image customization
+	isoImage = {
+		volumeID = lib.mkForce "PERF_WORKSHOP";
+		makeEfiBootable = true;
+		makeUsbBootable = true;
+	};
+	image.fileName = lib.mkForce "perf-workshop-${config.system.nixos.label}-x86_64.iso";
+}

nix/netboot.nix

@@ -0,0 +1,8 @@
+# NixOS netboot-specific configuration
+{ config, lib, pkgs, workshopSrc, ... }:
+
+{
+	imports = [ ./common.nix ];
+
+	# Netboot runs entirely from RAM by default (initrd contains squashfs)
+}

nix/packages.nix

@@ -0,0 +1,45 @@
+# Shared package list for the Linux Performance Workshop
+{ pkgs, kernelPackages ? pkgs.linuxPackages }:
+
+with pkgs; [
+	# Build essentials
+	gcc
+	gnumake
+	binutils
+	pkg-config
+
+	# Performance and tracing tools
+	perf
+	strace
+	ltrace
+	htop
+	bpftrace
+
+	# Python ecosystem
+	(python3.withPackages (ps: with ps; [
+		pip
+		flask  # for scenario7 pyroscope demo
+	]))
+	py-spy
+
+	# Benchmarking and debugging
+	hyperfine
+	valgrind
+	flamegraph
+
+	# USDT/SDT support (provides sys/sdt.h)
+	libsystemtap
+
+	# Continuous profiling
+	pyroscope
+
+	# Utilities
+	curl
+	wget
+	git
+	file
+	which
+	less
+	vim
+	nano
+]

nix/system-manager.nix

@@ -0,0 +1,33 @@
+# System-manager module for Ubuntu systems
+{ config, lib, pkgs, ... }:
+
+let
+	workshopPackages = import ./packages.nix { inherit pkgs; };
+in
+{
+	config = {
+		nixpkgs.hostPlatform = "x86_64-linux";
+
+		environment.systemPackages = workshopPackages;
+
+		# Create a script to configure perf permissions
+		# (system-manager cannot set sysctl directly)
+		environment.etc."perf-workshop-setup.sh" = {
+			mode = "0755";
+			text = ''
+				#!/bin/sh
+				# Run this script to enable perf for non-root users
+				echo "Setting kernel.perf_event_paranoid=1..."
+				sudo sysctl -w kernel.perf_event_paranoid=1
+
+				# Make it persistent
+				if ! grep -q "kernel.perf_event_paranoid" /etc/sysctl.conf 2>/dev/null; then
+					echo "kernel.perf_event_paranoid=1" | sudo tee -a /etc/sysctl.conf
+					echo "Added to /etc/sysctl.conf for persistence"
+				fi
+
+				echo "Done! You can now use perf as a regular user."
+			'';
+		};
+	};
+}