Arkady Miasnikov larytet

	wget https://raw.githubusercontent.com/torvalds/linux/master/scripts/extract-vmlinux
	chmod +x extract-vmlinux
	sudo ./extract-vmlinux /boot/vmlinuz-`uname -r` > vmlinux
	crash vmlinux


	// Use MAXMAPENTRIES to set the maximum size of the array
	// for example sudo stap -D MAXMAPENTRIES=40000 ./src/driver/load_measurement.stp
	global probe_frequency%
	global processes%

	probe begin
	{
	printf("Ctrl-C to print the results\n");
	}


	/*
	Shared memory (SHM_FIFO) is a byte ring buffer in the virtual memory. Driver pushes the data to
	the tail of the FIFO (producer) and user space application reads the data from the head of the
	buffer. Driver always places data structures in consecutive memory. If there is not enough
	room to place the whole structure into the ring buffer without wrap around driver places special
	"skip" code until the last byte of the allocated virtual memory and writes the structure
	starting with offset zero. Application knows to handle the wrap around correctly by checking
	if there is enough space for a strcuture of minimum size and skipping the data to the end of the
	virtual memory.

	static void *rvmalloc(unsigned long size)
	{
	void *mem;
	unsigned long adr;

	size = PAGE_ALIGN(size);
	mem = vzalloc(size); //syscalls_trace_buffer;//vmalloc(size);
	# if (SHM_RESERVE_PAGES > 0)
	if (mem) {
	// memset(mem, 0, size); vzalloc() will zero the memory

	#include <stdio.h>
	#include <stddef.h>

	// Based on https://stackoverflow.com/questions/1872220/is-it-possible-to-iterate-over-arguments-in-variadic-macros
	struct a
	{
	int a;
	int b;
	int c;
	};

	#!/usr/bin/env python

	# See also http://www.averk.net/passgen.html
	# https://www.passwordcard.org/en

	'''
	The script will output something like

	A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
	1 W j ~ E ^ y x ! N q S ! r e e g a q f P c Q : q & Q

	// https://godbolt.org/g/56Lv4f - 62 opcodes
	int strcmp_original(char a, char b)
	{
	int c = strlen(a) > strlen(b) ? strlen(a) : strlen(b);
	char * d;

	for (d = a;d < a + c;++d, ++b)
	{
	if (d != b)
	{

	// Shorter version of the same, failed after 400 driver restarts

	/*
	Load and run:
	scl enable devtoolset-4 bash
	stap -g -p4 -m test_open -v -k test_open.stp
	count=0;while [ 1 ];do echo $count;count=$(($count+1));sudo rmmod test_open;sudo staprun test_open.ko -L ;done;
	*/

	global ARRAY_FILENAME%