1 | /* |
2 | * Copyright (c) 2019 Apple 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 | #ifndef _KERN_SCHED_AMP_COMMON_H_ |
30 | #define _KERN_SCHED_AMP_COMMON_H_ |
31 | |
32 | #if __AMP__ |
33 | |
34 | /* Routine to initialize processor sets on AMP platforms */ |
35 | void sched_amp_init(void); |
36 | |
37 | /* |
38 | * The AMP scheduler uses spill/steal/rebalance logic to make sure the most appropriate threads |
39 | * are scheduled on the P/E clusters. Here are the definitions of those terms: |
40 | * |
41 | * - Spill: Spill threads from an overcommited P-cluster onto the E-cluster. This is needed to make sure |
42 | * that high priority P-recommended threads experience low scheduling latency in the presence of |
43 | * lots of P-recommended threads. |
44 | * |
45 | * - Steal: From an E-core, steal a thread from the P-cluster to provide low scheduling latency for |
46 | * P-recommended threads. |
47 | * |
48 | * - Rebalance: Once a P-core goes idle, check if the E-cores are running any P-recommended threads and |
49 | * bring it back to run on its recommended cluster type. |
50 | */ |
51 | |
52 | /* Spill logic */ |
53 | int sched_amp_spill_threshold(processor_set_t pset); |
54 | void pset_signal_spill(processor_set_t pset, int spilled_thread_priority); |
55 | bool pset_should_accept_spilled_thread(processor_set_t pset, int spilled_thread_priority); |
56 | bool should_spill_to_ecores(processor_set_t nset, thread_t thread); |
57 | void sched_amp_check_spill(processor_set_t pset, thread_t thread); |
58 | |
59 | /* Steal logic */ |
60 | int sched_amp_steal_threshold(processor_set_t pset, bool spill_pending); |
61 | bool sched_amp_steal_thread_enabled(processor_set_t pset); |
62 | |
63 | /* Rebalance logic */ |
64 | bool sched_amp_balance(processor_t cprocessor, processor_set_t cpset); |
65 | |
66 | /* IPI policy */ |
67 | sched_ipi_type_t sched_amp_ipi_policy(processor_t dst, thread_t thread, boolean_t dst_idle, sched_ipi_event_t event); |
68 | |
69 | uint32_t sched_amp_qos_max_parallelism(int qos, uint64_t options); |
70 | void sched_amp_bounce_thread_group_from_ecores(processor_set_t pset, struct thread_group *tg); |
71 | |
72 | pset_node_t sched_amp_choose_node(thread_t thread); |
73 | |
74 | #endif /* __AMP__ */ |
75 | |
76 | #endif /* _KERN_SCHED_AMP_COMMON_H_ */ |
77 | |