/*
- * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
/* Force a preemption point for a thread and wait for it to stop running */
extern boolean_t thread_stop(
- thread_t thread);
+ thread_t thread,
+ boolean_t until_not_runnable);
/* Release a previous stop request */
extern void thread_unstop(
/* Wait for a thread to stop running */
extern void thread_wait(
- thread_t thread);
-
-/* Select a thread to run */
-extern thread_t thread_select(
- processor_t myprocessor);
+ thread_t thread,
+ boolean_t until_not_runnable);
/* Unblock thread on wake up */
extern boolean_t thread_unblock(
thread_t thread,
wait_result_t wresult);
-/* Context switch primitive */
-extern boolean_t thread_invoke(
- thread_t old_thread,
- thread_t new_thread,
- ast_t reason);
-
-/* Perform calculations for thread finishing execution */
-extern void thread_done(
- thread_t old_thread,
- thread_t new_thread,
- processor_t processor);
-
-/* Set up for thread beginning execution */
-extern void thread_begin(
- thread_t thread,
- processor_t processor);
-
-/* Handle previous thread at context switch */
+/* Handle threads at context switch */
extern void thread_dispatch(
- thread_t thread);
+ thread_t old_thread,
+ thread_t new_thread);
/* Switch directly to a particular thread */
extern int thread_run(
thread_t thread);
/* Periodic scheduler activity */
-extern void sched_tick_thread(void);
+extern void sched_init_thread(void (*)(void));
/* Perform sched_tick housekeeping activities */
-extern void update_priority(
+extern boolean_t can_update_priority(
thread_t thread);
+extern void update_priority(
+ thread_t thread);
+
+extern void lightweight_update_priority(
+ thread_t thread);
+
+extern void sched_traditional_quantum_expire(thread_t thread);
+
/* Idle processor thread */
extern void idle_thread(void);
extern kern_return_t idle_thread_create(
processor_t processor);
-/* Start thread running */
-extern void thread_bootstrap_return(void);
-
/* Continuation return from syscall */
extern void thread_syscall_return(
kern_return_t ret);
thread_t thread,
integer_t options);
-#define SCHED_TAILQ 0
-#define SCHED_HEADQ 1
-#define SCHED_PREEMPT 2
+#define SCHED_TAILQ 1
+#define SCHED_HEADQ 2
+#define SCHED_PREEMPT 4
-/* Bind thread to a particular processor */
+extern processor_set_t task_choose_pset(
+ task_t task);
+
+/* Bind the current thread to a particular processor */
extern processor_t thread_bind(
- thread_t thread,
processor_t processor);
+/* Choose the best processor to run a thread */
+extern processor_t choose_processor(
+ processor_set_t pset,
+ processor_t processor,
+ thread_t thread);
+
+/* Choose a thread from a processor's priority-based runq */
+extern thread_t choose_thread(
+ processor_t processor,
+ run_queue_t runq,
+ int priority);
+
+
+extern void thread_quantum_init(
+ thread_t thread);
+
+extern void run_queue_init(
+ run_queue_t runq);
+
+extern thread_t run_queue_dequeue(
+ run_queue_t runq,
+ integer_t options);
+
+extern boolean_t run_queue_enqueue(
+ run_queue_t runq,
+ thread_t thread,
+ integer_t options);
+
+extern void run_queue_remove(
+ run_queue_t runq,
+ thread_t thread);
+
+/* Remove thread from its run queue */
+extern boolean_t thread_run_queue_remove(
+ thread_t thread);
+
extern void thread_timer_expire(
void *thread,
void *p1);
+extern boolean_t thread_eager_preemption(
+ thread_t thread);
+
+/* Fair Share routines */
+#if defined(CONFIG_SCHED_TRADITIONAL) || defined(CONFIG_SCHED_PROTO) || defined(CONFIG_SCHED_FIXEDPRIORITY)
+void sched_traditional_fairshare_init(void);
+
+int sched_traditional_fairshare_runq_count(void);
+
+uint64_t sched_traditional_fairshare_runq_stats_count_sum(void);
+
+void sched_traditional_fairshare_enqueue(thread_t thread);
+
+thread_t sched_traditional_fairshare_dequeue(void);
+
+boolean_t sched_traditional_fairshare_queue_remove(thread_t thread);
+#endif
+
+#if defined(CONFIG_SCHED_GRRR) || defined(CONFIG_SCHED_FIXEDPRIORITY)
+void sched_grrr_fairshare_init(void);
+
+int sched_grrr_fairshare_runq_count(void);
+
+uint64_t sched_grrr_fairshare_runq_stats_count_sum(void);
+
+void sched_grrr_fairshare_enqueue(thread_t thread);
+
+thread_t sched_grrr_fairshare_dequeue(void);
+
+boolean_t sched_grrr_fairshare_queue_remove(thread_t thread);
+#endif
+
+extern boolean_t sched_generic_direct_dispatch_to_idle_processors;
+
/* Set the maximum interrupt level for the thread */
__private_extern__ wait_interrupt_t thread_interrupt_level(
wait_interrupt_t interruptible);
thread_t thread,
wait_result_t result);
+extern void sched_stats_handle_csw(
+ processor_t processor,
+ int reasons,
+ int selfpri,
+ int otherpri);
+
+extern void sched_stats_handle_runq_change(
+ struct runq_stats *stats,
+ int old_count);
+
+
+
+#define SCHED_STATS_CSW(processor, reasons, selfpri, otherpri) \
+do { \
+ if (__builtin_expect(sched_stats_active, 0)) { \
+ sched_stats_handle_csw((processor), \
+ (reasons), (selfpri), (otherpri)); \
+ } \
+} while (0)
+
+
+#define SCHED_STATS_RUNQ_CHANGE(stats, old_count) \
+do { \
+ if (__builtin_expect(sched_stats_active, 0)) { \
+ sched_stats_handle_runq_change((stats), \
+ (old_count)); \
+ } \
+} while (0)
+
+#define THREAD_URGENCY_NONE 0 /* indicates that there is no currently runnable */
+#define THREAD_URGENCY_BACKGROUND 1 /* indicates that the thread is marked as a "background" thread */
+#define THREAD_URGENCY_NORMAL 2 /* indicates that the thread is marked as a "normal" thread */
+#define THREAD_URGENCY_REAL_TIME 3 /* indicates that the thread is marked as a "real-time" or urgent thread */
+#define THREAD_URGENCY_MAX 4 /* Marker */
+/* Returns the "urgency" of a thread (provided by scheduler) */
+extern int thread_get_urgency(
+ thread_t thread,
+ uint64_t *rt_period,
+ uint64_t *rt_deadline);
+
+/* Tells the "urgency" of the just scheduled thread (provided by CPU PM) */
+extern void thread_tell_urgency(
+ int urgency,
+ uint64_t rt_period,
+ uint64_t rt_deadline,
+ thread_t nthread);
+
+/* Tells if there are "active" RT threads in the system (provided by CPU PM) */
+extern void active_rt_threads(
+ boolean_t active);
+
#endif /* MACH_KERNEL_PRIVATE */
__BEGIN_DECLS
extern boolean_t assert_wait_possible(void);
+/* Toggles a global override to turn off CPU Throttling */
+#define CPU_THROTTLE_DISABLE 0
+#define CPU_THROTTLE_ENABLE 1
+extern void sys_override_cpu_throttle(int flag);
+
/*
****************** Only exported until BSD stops using ********************
*/
thread_t thread,
wait_result_t result);
+/* Start thread running */
+extern void thread_bootstrap_return(void);
+
/* Return from exception (BSD-visible interface) */
-extern void thread_exception_return(void);
+extern void thread_exception_return(void) __dead2;
#endif /* XNU_KERNEL_PRIVATE */
uint32_t interval,
uint32_t scale_factor);
+/* Assert that the thread intends to wait with an urgency, timeout and leeway */
+extern wait_result_t assert_wait_timeout_with_leeway(
+ event_t event,
+ wait_interrupt_t interruptible,
+ wait_timeout_urgency_t urgency,
+ uint32_t interval,
+ uint32_t leeway,
+ uint32_t scale_factor);
+
extern wait_result_t assert_wait_deadline(
event_t event,
wait_interrupt_t interruptible,
uint64_t deadline);
+/* Assert that the thread intends to wait with an urgency, deadline, and leeway */
+extern wait_result_t assert_wait_deadline_with_leeway(
+ event_t event,
+ wait_interrupt_t interruptible,
+ wait_timeout_urgency_t urgency,
+ uint64_t deadline,
+ uint64_t leeway);
+
/* Wake up thread (or threads) waiting on a particular event */
extern kern_return_t thread_wakeup_prim(
event_t event,
boolean_t one_thread,
- wait_result_t result);
+ wait_result_t result);
+
+extern kern_return_t thread_wakeup_prim_internal(
+ event_t event,
+ boolean_t one_thread,
+ wait_result_t result,
+ int priority);
+
#define thread_wakeup(x) \
thread_wakeup_prim((x), FALSE, THREAD_AWAKENED)
#define thread_wakeup_one(x) \
thread_wakeup_prim((x), TRUE, THREAD_AWAKENED)
+#ifdef MACH_KERNEL_PRIVATE
+#define thread_wakeup_one_with_pri(x, pri) \
+ thread_wakeup_prim_internal((x), TRUE, THREAD_AWAKENED, pri)
+#endif
+
extern boolean_t preemption_enabled(void);
-#ifdef KERNEL_PRIVATE
+#ifdef MACH_KERNEL_PRIVATE
/*
- * Obsolete interfaces.
+ * Scheduler algorithm indirection. If only one algorithm is
+ * enabled at compile-time, a direction function call is used.
+ * If more than one is enabled, calls are dispatched through
+ * a function pointer table.
*/
-extern void thread_set_timer(
- uint32_t interval,
- uint32_t scale_factor);
+#if !defined(CONFIG_SCHED_TRADITIONAL) && !defined(CONFIG_SCHED_PROTO) && !defined(CONFIG_SCHED_GRRR) && !defined(CONFIG_SCHED_FIXEDPRIORITY)
+#error Enable at least one scheduler algorithm in osfmk/conf/MASTER.XXX
+#endif
+
+#define SCHED(f) (sched_current_dispatch->f)
+
+struct sched_dispatch_table {
+ void (*init)(void); /* Init global state */
+ void (*timebase_init)(void); /* Timebase-dependent initialization */
+ void (*processor_init)(processor_t processor); /* Per-processor scheduler init */
+ void (*pset_init)(processor_set_t pset); /* Per-processor set scheduler init */
+
+ void (*maintenance_continuation)(void); /* Function called regularly */
+
+ /*
+ * Choose a thread of greater or equal priority from the per-processor
+ * runqueue for timeshare/fixed threads
+ */
+ thread_t (*choose_thread)(
+ processor_t processor,
+ int priority);
+
+ /*
+ * Steal a thread from another processor in the pset so that it can run
+ * immediately
+ */
+ thread_t (*steal_thread)(
+ processor_set_t pset);
+
+ /*
+ * Recalculate sched_pri based on base priority, past running time,
+ * and scheduling class.
+ */
+ void (*compute_priority)(
+ thread_t thread,
+ boolean_t override_depress);
+
+ /*
+ * Pick the best processor for a thread (any kind of thread) to run on.
+ */
+ processor_t (*choose_processor)(
+ processor_set_t pset,
+ processor_t processor,
+ thread_t thread);
+ /*
+ * Enqueue a timeshare or fixed priority thread onto the per-processor
+ * runqueue
+ */
+ boolean_t (*processor_enqueue)(
+ processor_t processor,
+ thread_t thread,
+ integer_t options);
+
+ /* Migrate threads away in preparation for processor shutdown */
+ void (*processor_queue_shutdown)(
+ processor_t processor);
+
+ /* Remove the specific thread from the per-processor runqueue */
+ boolean_t (*processor_queue_remove)(
+ processor_t processor,
+ thread_t thread);
+
+ /*
+ * Does the per-processor runqueue have any timeshare or fixed priority
+ * threads on it? Called without pset lock held, so should
+ * not assume immutability while executing.
+ */
+ boolean_t (*processor_queue_empty)(processor_t processor);
+
+ /*
+ * Would this priority trigger an urgent preemption if it's sitting
+ * on the per-processor runqueue?
+ */
+ boolean_t (*priority_is_urgent)(int priority);
+
+ /*
+ * Does the per-processor runqueue contain runnable threads that
+ * should cause the currently-running thread to be preempted?
+ */
+ ast_t (*processor_csw_check)(processor_t processor);
+
+ /*
+ * Does the per-processor runqueue contain a runnable thread
+ * of > or >= priority, as a preflight for choose_thread() or other
+ * thread selection
+ */
+ boolean_t (*processor_queue_has_priority)(processor_t processor,
+ int priority,
+ boolean_t gte);
+
+ /* Quantum size for the specified non-realtime thread. */
+ uint32_t (*initial_quantum_size)(thread_t thread);
+
+ /* Scheduler mode for a new thread */
+ sched_mode_t (*initial_thread_sched_mode)(task_t parent_task);
+
+ /* Scheduler algorithm supports timeshare (decay) mode */
+ boolean_t (*supports_timeshare_mode)(void);
+
+ /*
+ * Is it safe to call update_priority, which may change a thread's
+ * runqueue or other state. This can be used to throttle changes
+ * to dynamic priority.
+ */
+ boolean_t (*can_update_priority)(thread_t thread);
+
+ /*
+ * Update both scheduled priority and other persistent state.
+ * Side effects may including migration to another processor's runqueue.
+ */
+ void (*update_priority)(thread_t thread);
+
+ /* Lower overhead update to scheduled priority and state. */
+ void (*lightweight_update_priority)(thread_t thread);
+
+ /* Callback for non-realtime threads when the quantum timer fires */
+ void (*quantum_expire)(thread_t thread);
+
+ /*
+ * Even though we could continue executing on this processor, does the
+ * topology (SMT, for instance) indicate that a better processor could be
+ * chosen
+ */
+ boolean_t (*should_current_thread_rechoose_processor)(processor_t processor);
+
+ /*
+ * Runnable threads on per-processor runqueue. Should only
+ * be used for relative comparisons of load between processors.
+ */
+ int (*processor_runq_count)(processor_t processor);
+
+ /* Aggregate runcount statistics for per-processor runqueue */
+ uint64_t (*processor_runq_stats_count_sum)(processor_t processor);
+
+ /* Initialize structures to track demoted fairshare threads */
+ void (*fairshare_init)(void);
+
+ /* Number of runnable fairshare threads */
+ int (*fairshare_runq_count)(void);
+
+ /* Aggregate runcount statistics for fairshare runqueue */
+ uint64_t (*fairshare_runq_stats_count_sum)(void);
+
+ void (*fairshare_enqueue)(thread_t thread);
+
+ thread_t (*fairshare_dequeue)(void);
+
+ boolean_t (*fairshare_queue_remove)(thread_t thread);
+
+ /*
+ * Use processor->next_thread to pin a thread to an idle
+ * processor. If FALSE, threads are enqueued and can
+ * be stolen by other processors.
+ */
+ boolean_t direct_dispatch_to_idle_processors;
+};
+
+#if defined(CONFIG_SCHED_TRADITIONAL)
+#define kSchedTraditionalString "traditional"
+#define kSchedTraditionalWithPsetRunqueueString "traditional_with_pset_runqueue"
+extern const struct sched_dispatch_table sched_traditional_dispatch;
+extern const struct sched_dispatch_table sched_traditional_with_pset_runqueue_dispatch;
+#endif
+
+#if defined(CONFIG_SCHED_PROTO)
+#define kSchedProtoString "proto"
+extern const struct sched_dispatch_table sched_proto_dispatch;
+#endif
+
+#if defined(CONFIG_SCHED_GRRR)
+#define kSchedGRRRString "grrr"
+extern const struct sched_dispatch_table sched_grrr_dispatch;
+#endif
+
+#if defined(CONFIG_SCHED_FIXEDPRIORITY)
+#define kSchedFixedPriorityString "fixedpriority"
+#define kSchedFixedPriorityWithPsetRunqueueString "fixedpriority_with_pset_runqueue"
+extern const struct sched_dispatch_table sched_fixedpriority_dispatch;
+extern const struct sched_dispatch_table sched_fixedpriority_with_pset_runqueue_dispatch;
+#endif
-extern void thread_set_timer_deadline(
- uint64_t deadline);
-
-extern void thread_cancel_timer(void);
-
-#ifndef MACH_KERNEL_PRIVATE
-
-#ifndef ABSOLUTETIME_SCALAR_TYPE
-
-#define thread_set_timer_deadline(a) \
- thread_set_timer_deadline(__OSAbsoluteTime(a))
-
-#endif /* ABSOLUTETIME_SCALAR_TYPE */
+/*
+ * It is an error to invoke any scheduler-related code
+ * before this is set up
+ */
+enum sched_enum {
+ sched_enum_unknown = 0,
+#if defined(CONFIG_SCHED_TRADITIONAL)
+ sched_enum_traditional = 1,
+ sched_enum_traditional_with_pset_runqueue = 2,
+#endif
+#if defined(CONFIG_SCHED_PROTO)
+ sched_enum_proto = 3,
+#endif
+#if defined(CONFIG_SCHED_GRRR)
+ sched_enum_grrr = 4,
+#endif
+#if defined(CONFIG_SCHED_FIXEDPRIORITY)
+ sched_enum_fixedpriority = 5,
+ sched_enum_fixedpriority_with_pset_runqueue = 6,
+#endif
+ sched_enum_max = 7
+};
+
+extern const struct sched_dispatch_table *sched_current_dispatch;
#endif /* MACH_KERNEL_PRIVATE */
-#endif /* KERNEL_PRIVATE */
-
__END_DECLS
#endif /* _KERN_SCHED_PRIM_H_ */
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