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