//-------------------------------------------------------------------
//	memused.c
//
//	This module creates a pseudo-file named '/proc/memused' that
//	lets an application see its allocation of virtual memory (in
//	killobytes), as recorded in its task_struct's 'mm->total_vm' 
//	field (where the number of the task's 4KB pages is stored).   
//
//	NOTE: Developed and tested with Linux kernel version 2.4.26.
//
//	programmer: ALLAN CRUSE
//	written on: 15 NOV 2004
//-------------------------------------------------------------------

#include <linux/module.h>	// for init_module() 
#include <linux/proc_fs.h>	// for create_proc_info_entry() 


static char modname[] = "memused";


static int my_get_info( char *buf, char **start, off_t off, int count )
{
	struct task_struct	*task = current;
	int	kbytes = 4 * task->mm->total_vm;
	int	len = 0;

	len += sprintf( buf+len, "%15s ", task->comm );
	len += sprintf( buf+len, "%d kB ", kbytes );
	len += sprintf( buf+len, "\n" );
	return	len;
}


int init_module( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );
	create_proc_info_entry( modname, 0, NULL, my_get_info );
	return	0;  //SUCCESS
}


void cleanup_module( void )
{
	remove_proc_entry( modname, NULL );
	printk( "<1>Removing \'%s\' module\n", modname );
}

MODULE_LICENSE("GPL");