/* * Copyright (c) 2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ * */ /*- * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/kern_event.h> #include <sys/kern_memorystatus.h> #include <kern/sched_prim.h> #include <kern/task.h> #include <kern/thread.h> #include <libkern/libkern.h> #include <sys/sysctl.h> static void kern_memorystatus_thread(void); int kern_memorystatus_wakeup = 0; int kern_memorystatus_pause = 0; int kern_memorystatus_level = 0; int kern_memorystatus_last_level = 0; unsigned int kern_memorystatus_kev_failure_count = 0; SYSCTL_INT(_kern, OID_AUTO, memorystatus_level, CTLFLAG_RD, &kern_memorystatus_level, 0, ""); SYSCTL_UINT(_kern, OID_AUTO, memorystatus_kev_failure_count, CTLFLAG_RD, &kern_memorystatus_kev_failure_count, 0, ""); __private_extern__ void kern_memorystatus_init(void) { (void)kernel_thread(kernel_task, kern_memorystatus_thread); } static void kern_memorystatus_thread(void) { struct kev_msg ev_msg; int ret; while(1) { kern_memorystatus_last_level = kern_memorystatus_level; ev_msg.vendor_code = KEV_VENDOR_APPLE; ev_msg.kev_class = KEV_SYSTEM_CLASS; ev_msg.kev_subclass = KEV_MEMORYSTATUS_SUBCLASS; /* pass the memory status level in the event code (as percent used) */ ev_msg.event_code = 100 - kern_memorystatus_last_level; ev_msg.dv[0].data_length = 0; ret = kev_post_msg(&ev_msg); if (ret) { kern_memorystatus_kev_failure_count++; printf("%s: kev_post_msg() failed, err %d\n", __func__, ret); } assert_wait_timeout((event_t)&kern_memorystatus_pause, THREAD_UNINT, 1, 250*1000*NSEC_PER_USEC); (void)thread_block(THREAD_CONTINUE_NULL); if (kern_memorystatus_level >= kern_memorystatus_last_level + 5 || kern_memorystatus_level <= kern_memorystatus_last_level - 5) continue; assert_wait(&kern_memorystatus_wakeup, THREAD_UNINT); (void)thread_block((thread_continue_t)kern_memorystatus_thread); } }