1 /* 2 * Copyright (c) 2011-2018 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 #include <kern/thread.h> 30 #include <stdbool.h> 31 32 #define KPERF_PET_DEFAULT_IDLE_RATE 15 33 34 extern bool kppet_lightweight_active; 35 extern _Atomic uint32_t kppet_gencount; 36 37 /* 38 * If `actionid` is non-zero, set up PET to sample the action. Otherwise, 39 * disable PET. 40 */ 41 void kppet_config(unsigned int actionid); 42 43 /* 44 * Reset PET back to its default settings. 45 */ 46 void kppet_reset(void); 47 48 /* 49 * Notify PET that new threads are switching on-CPU. 50 */ 51 void kppet_on_cpu(thread_t thread, thread_continue_t continuation, 52 uintptr_t *starting_frame); 53 54 /* 55 * Wake the PET thread from its timer handler. 56 */ 57 void kppet_wake_thread(void); 58 59 /* 60 * For configuring PET from the sysctl interface. 61 */ 62 int kppet_get_idle_rate(void); 63 int kppet_set_idle_rate(int new_idle_rate); 64 int kppet_get_lightweight_pet(void); 65 int kppet_set_lightweight_pet(int on); 66 67 /* 68 * Update whether lightweight PET is active when turning sampling on and off. 69 */ 70 void kppet_lightweight_active_update(void); 71