1/* 2 * Copyright (c) 2006 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/*- 30 * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org> 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 42 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 43 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 44 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 45 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 46 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 47 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 48 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 49 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 50 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 51 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 */ 54 55#include <sys/kern_event.h> 56#include <sys/kern_memorystatus.h> 57 58#include <kern/sched_prim.h> 59#include <kern/task.h> 60#include <kern/thread.h> 61#include <libkern/libkern.h> 62#include <sys/sysctl.h> 63 64extern unsigned int vm_page_free_count; 65extern unsigned int vm_page_active_count; 66extern unsigned int vm_page_inactive_count; 67extern unsigned int vm_page_purgeable_count; 68extern unsigned int vm_page_wire_count; 69 70static void kern_memorystatus_thread(void); 71 72int kern_memorystatus_wakeup = 0; 73int kern_memorystatus_level = 0; 74int kern_memorystatus_last_level = 0; 75unsigned int kern_memorystatus_kev_failure_count = 0; 76 77SYSCTL_INT(_kern, OID_AUTO, memorystatus_level, CTLFLAG_RD, &kern_memorystatus_level, 0, ""); 78SYSCTL_UINT(_kern, OID_AUTO, memorystatus_kev_failure_count, CTLFLAG_RD, &kern_memorystatus_kev_failure_count, 0, ""); 79 80__private_extern__ void 81kern_memorystatus_init(void) 82{ 83 (void)kernel_thread(kernel_task, kern_memorystatus_thread); 84} 85 86static void 87kern_memorystatus_thread(void) 88{ 89 struct kev_msg ev_msg; 90 struct { 91 uint32_t free_pages; 92 uint32_t active_pages; 93 uint32_t inactive_pages; 94 uint32_t purgeable_pages; 95 uint32_t wired_pages; 96 } data; 97 int ret; 98 99 while(1) { 100 101 kern_memorystatus_last_level = kern_memorystatus_level; 102 103 ev_msg.vendor_code = KEV_VENDOR_APPLE; 104 ev_msg.kev_class = KEV_SYSTEM_CLASS; 105 ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS; 106 107 /* pass the memory status level in the event code (as percent used) */ 108 ev_msg.event_code = 100 - kern_memorystatus_last_level; 109 110 ev_msg.dv[0].data_length = sizeof data; 111 ev_msg.dv[0].data_ptr = &data; 112 ev_msg.dv[1].data_length = 0; 113 114 data.free_pages = vm_page_free_count; 115 data.active_pages = vm_page_active_count; 116 data.inactive_pages = vm_page_inactive_count; 117 data.purgeable_pages = vm_page_purgeable_count; 118 data.wired_pages = vm_page_wire_count; 119 120 ret = kev_post_msg(&ev_msg); 121 if (ret) { 122 kern_memorystatus_kev_failure_count++; 123 printf("%s: kev_post_msg() failed, err %d\n", __func__, ret); 124 } 125 126 if (kern_memorystatus_level >= kern_memorystatus_last_level + 5 || 127 kern_memorystatus_level <= kern_memorystatus_last_level - 5) 128 continue; 129 130 assert_wait(&kern_memorystatus_wakeup, THREAD_UNINT); 131 (void)thread_block((thread_continue_t)kern_memorystatus_thread); 132 } 133} 134