1/*
2 * Copyright (c) 2011 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
31#define KPERF_PET_DEFAULT_IDLE_RATE (15)
32
33extern boolean_t kperf_lightweight_pet_active;
34extern uint32_t kperf_pet_gen;
35
36/* prepare PET to be able to fire action with given ID, or disable PET */
37void kperf_pet_config(unsigned int action_id);
38
39/* fire off a PET sample, both before and after on-core samples */
40void kperf_pet_fire_before(void);
41void kperf_pet_fire_after(void);
42
43/* notify PET of new threads switching on */
44void kperf_pet_on_cpu(thread_t thread, thread_continue_t continuation,
45 uintptr_t *starting_frame);
46
47/* get/set rate at which idle threads are sampled by PET */
48int kperf_get_pet_idle_rate(void);
49int kperf_set_pet_idle_rate(int val);
50
51/* get/set whether lightweight PET is enabled */
52int kperf_get_lightweight_pet(void);
53int kperf_set_lightweight_pet(int val);
54
55void kperf_lightweight_pet_active_update(void);
56