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 | |