/* 
 * This is the header file for user programs to receive signals
 * on VM events. Use it ONLY with the vmsig-patched kernel
 * (linux-2.6.13-vmsig). The vmsig_register(flag) system call is
 * used to tell the kernel which VM events you want to receive
 * signals on.
 *
 * Yi Feng <yifeng@cs.umass.edu>
 */
#ifndef __LINUX_VMSIG_H
#define __LINUX_VMSIG_H

#include <linux/linkage.h>
#include <linux/unistd.h>

/* The signal number we use - this is a real-time signal. */
#define SIGVM				35

/* The VM events you can specify in vmsig_register(). */
#define VM_EVICTING_CLEAN	0x1
#define VM_EVICTING_DIRTY	0x2
#define VM_SWAPPED_OUT		0x4
#define VM_FAULTED_IN		0x8
#define VM_PREFETCHED		0x10

/* 
 * A new advice flag for madvise() that lets the kernel swap out
 * the specified pages under memory pressure. If these pages don't
 * contain useful data, the user should use madvise() with the
 * MADV_DONTNEED flag.
 */
#define MADV_RELINQUISH		0x5

/* The system call interface. */
#define __NR_vmsig_register	294
_syscall1(long, vmsig_register, unsigned int, flag)

#endif