vm_behavior.h (3521B) - Raw
1 /* 2 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * @OSF_COPYRIGHT@ 30 */ 31 /* 32 * File: mach/vm_behavior.h 33 * 34 * Virtual memory map behavior definitions. 35 * 36 */ 37 38 #ifndef _MACH_VM_BEHAVIOR_H_ 39 #define _MACH_VM_BEHAVIOR_H_ 40 41 /* 42 * Types defined: 43 * 44 * vm_behavior_t behavior codes. 45 */ 46 47 typedef int vm_behavior_t; 48 49 /* 50 * Enumeration of valid values for vm_behavior_t. 51 * These describe expected page reference behavior for 52 * for a given range of virtual memory. For implementation 53 * details see vm/vm_fault.c 54 * 55 * When making a new VM_BEHAVIOR_*, update tests vm_parameter_validation_[user|kern] 56 * and their expected results; they deliberately call VM functions with invalid 57 * behavior values and you may be turning one of those invalid behaviors valid. 58 */ 59 60 61 /* 62 * The following behaviors affect the memory region's future behavior 63 * and are stored in the VM map entry data structure. 64 */ 65 #define VM_BEHAVIOR_DEFAULT ((vm_behavior_t) 0) /* default */ 66 #define VM_BEHAVIOR_RANDOM ((vm_behavior_t) 1) /* random */ 67 #define VM_BEHAVIOR_SEQUENTIAL ((vm_behavior_t) 2) /* forward sequential */ 68 #define VM_BEHAVIOR_RSEQNTL ((vm_behavior_t) 3) /* reverse sequential */ 69 70 /* 71 * The following "behaviors" affect the memory region only at the time of the 72 * call and are not stored in the VM map entry. 73 */ 74 #define VM_BEHAVIOR_WILLNEED ((vm_behavior_t) 4) /* will need in near future */ 75 #define VM_BEHAVIOR_DONTNEED ((vm_behavior_t) 5) /* dont need in near future */ 76 #define VM_BEHAVIOR_FREE ((vm_behavior_t) 6) /* free memory without write-back */ 77 #define VM_BEHAVIOR_ZERO_WIRED_PAGES ((vm_behavior_t) 7) /* zero out the wired pages of an entry if it is being deleted without unwiring them first */ 78 #define VM_BEHAVIOR_REUSABLE ((vm_behavior_t) 8) 79 #define VM_BEHAVIOR_REUSE ((vm_behavior_t) 9) 80 #define VM_BEHAVIOR_CAN_REUSE ((vm_behavior_t) 10) 81 #define VM_BEHAVIOR_PAGEOUT ((vm_behavior_t) 11) /* force page-out of the pages in range (development only) */ 82 #define VM_BEHAVIOR_ZERO ((vm_behavior_t) 12) /* zero pages without faulting in additional pages */ 83 84 #define VM_BEHAVIOR_LAST_VALID (VM_BEHAVIOR_ZERO) 85 86 #endif /*_MACH_VM_BEHAVIOR_H_*/