[75f3522] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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[708ae38] | 7 | // kernel/private.hfa -- |
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[75f3522] | 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Mon Feb 13 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[fd9b524] | 12 | // Last Modified On : Wed Aug 12 08:21:33 2020 |
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| 13 | // Update Count : 9 |
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[75f3522] | 14 | // |
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| 15 | |
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[6b0b624] | 16 | #pragma once |
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[75f3522] | 17 | |
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[3489ea6] | 18 | #if !defined(__cforall_thread__) |
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[708ae38] | 19 | #error kernel/private.hfa should only be included in libcfathread source |
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[3489ea6] | 20 | #endif |
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| 21 | |
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[9cd5bd2] | 22 | #include <signal.h> |
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| 23 | |
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[58b6d1b] | 24 | #include "kernel.hfa" |
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| 25 | #include "thread.hfa" |
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[75f3522] | 26 | |
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[73abe95] | 27 | #include "alarm.hfa" |
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[8834751] | 28 | #include "stats.hfa" |
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[fa21ac9] | 29 | |
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[3489ea6] | 30 | extern "C" { |
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| 31 | #if defined(CFA_HAVE_LINUX_LIBRSEQ) |
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| 32 | #include <rseq/rseq.h> |
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| 33 | #elif defined(CFA_HAVE_LINUX_RSEQ_H) |
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[f558b5f] | 34 | #include <linux/rseq.h> |
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[3489ea6] | 35 | #else |
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| 36 | #ifndef _GNU_SOURCE |
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[708ae38] | 37 | #error kernel/private requires gnu_source |
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[3489ea6] | 38 | #endif |
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| 39 | #include <sched.h> |
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| 40 | #endif |
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| 41 | } |
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| 42 | |
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[d3605f8] | 43 | // Defines whether or not we *want* to use io_uring_enter as the idle_sleep blocking call |
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[f870e257] | 44 | // #define CFA_WANT_IO_URING_IDLE |
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[d3605f8] | 45 | |
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| 46 | // Defines whether or not we *can* use io_uring_enter as the idle_sleep blocking call |
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| 47 | #if defined(CFA_WANT_IO_URING_IDLE) && defined(CFA_HAVE_LINUX_IO_URING_H) |
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| 48 | #if defined(CFA_HAVE_IORING_OP_READ) || (defined(CFA_HAVE_READV) && defined(CFA_HAVE_IORING_OP_READV)) |
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| 49 | #define CFA_WITH_IO_URING_IDLE |
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| 50 | #endif |
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| 51 | #endif |
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[31c967b] | 52 | // #define READYQ_USE_LINEAR_AVG |
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| 53 | #define READYQ_USE_LOGDBL_AVG |
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| 54 | // #define READYQ_USE_LOGINT_AVG |
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| 55 | |
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| 56 | #if defined(READYQ_USE_LINEAR_AVG) |
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| 57 | typedef unsigned long long __readyQ_avg_t; |
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| 58 | #elif defined(READYQ_USE_LOGDBL_AVG) |
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| 59 | typedef double __readyQ_avg_t; |
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| 60 | #elif defined(READYQ_USE_LOGDBL_AVG) |
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| 61 | typedef unsigned long long __readyQ_avg_t; |
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| 62 | #else |
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| 63 | #error must pick a scheme for averaging |
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| 64 | #endif |
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[059ad16] | 65 | |
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[95dab9e] | 66 | extern "C" { |
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| 67 | __attribute__((visibility("protected"))) int __cfaabi_pthread_create(pthread_t *_thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg); |
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| 68 | __attribute__((visibility("protected"))) int __cfaabi_pthread_join(pthread_t _thread, void **retval); |
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| 69 | __attribute__((visibility("protected"))) pthread_t __cfaabi_pthread_self(void); |
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| 70 | __attribute__((visibility("protected"))) int __cfaabi_pthread_attr_init(pthread_attr_t *attr); |
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| 71 | __attribute__((visibility("protected"))) int __cfaabi_pthread_attr_destroy(pthread_attr_t *attr); |
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| 72 | __attribute__((visibility("protected"))) int __cfaabi_pthread_attr_setstack( pthread_attr_t *attr, void *stackaddr, size_t stacksize ); |
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| 73 | __attribute__((visibility("protected"))) int __cfaabi_pthread_attr_getstacksize( const pthread_attr_t *attr, size_t *stacksize ); |
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| 74 | __attribute__((visibility("protected"))) int __cfaabi_pthread_sigqueue(pthread_t _thread, int sig, const union sigval value); |
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| 75 | __attribute__((visibility("protected"))) int __cfaabi_pthread_sigmask( int how, const sigset_t *set, sigset_t *oset); |
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| 76 | } |
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| 77 | |
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[75f3522] | 78 | //----------------------------------------------------------------------------- |
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| 79 | // Scheduler |
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[31c967b] | 80 | union __attribute__((aligned(64))) __timestamp_t { |
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| 81 | struct { |
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| 82 | volatile unsigned long long tv; |
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| 83 | volatile __readyQ_avg_t ma; |
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| 84 | } t; |
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| 85 | char __padding[192]; |
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| 86 | }; |
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| 87 | |
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[1c273d0] | 88 | extern "C" { |
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[2026bb6] | 89 | void disable_interrupts() OPTIONAL_THREAD; |
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[a3821fa] | 90 | void enable_interrupts( bool poll = true ); |
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[1c273d0] | 91 | } |
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| 92 | |
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[24e321c] | 93 | void schedule_thread$( thread$ *, unpark_hint hint ) __attribute__((nonnull (1))); |
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[75f3522] | 94 | |
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[8fc652e0] | 95 | extern bool __preemption_enabled(); |
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| 96 | |
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[13fdf86] | 97 | enum { |
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| 98 | PREEMPT_NORMAL = 0, |
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| 99 | PREEMPT_TERMINATE = 1, |
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| 100 | PREEMPT_IO = 2, |
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| 101 | }; |
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| 102 | |
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[7d0ebd0] | 103 | static inline void __disable_interrupts_checked() { |
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| 104 | /* paranoid */ verify( __preemption_enabled() ); |
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| 105 | disable_interrupts(); |
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| 106 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 107 | } |
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| 108 | |
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| 109 | static inline void __enable_interrupts_checked( bool poll = true ) { |
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| 110 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 111 | enable_interrupts( poll ); |
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| 112 | /* paranoid */ verify( __preemption_enabled() ); |
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| 113 | } |
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| 114 | |
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[5afb49a] | 115 | //release/wake-up the following resources |
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[e84ab3d] | 116 | void __thread_finish( thread$ * thrd ); |
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[db6f06a] | 117 | |
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[3489ea6] | 118 | //----------------------------------------------------------------------------- |
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| 119 | // Hardware |
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| 120 | |
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| 121 | #if defined(CFA_HAVE_LINUX_LIBRSEQ) |
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| 122 | // No data needed |
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| 123 | #elif defined(CFA_HAVE_LINUX_RSEQ_H) |
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| 124 | extern "Cforall" { |
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[1bcbf02] | 125 | extern __attribute__((aligned(64))) __thread volatile struct rseq __cfaabi_rseq; |
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[3489ea6] | 126 | } |
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| 127 | #else |
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| 128 | // No data needed |
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| 129 | #endif |
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| 130 | |
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| 131 | static inline int __kernel_getcpu() { |
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| 132 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 133 | #if defined(CFA_HAVE_LINUX_LIBRSEQ) |
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[f558b5f] | 134 | return rseq_current_cpu(); |
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[3489ea6] | 135 | #elif defined(CFA_HAVE_LINUX_RSEQ_H) |
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[f558b5f] | 136 | int r = __cfaabi_rseq.cpu_id; |
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| 137 | /* paranoid */ verify( r >= 0 ); |
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| 138 | return r; |
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[3489ea6] | 139 | #else |
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| 140 | return sched_getcpu(); |
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| 141 | #endif |
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| 142 | } |
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| 143 | |
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[75f3522] | 144 | //----------------------------------------------------------------------------- |
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| 145 | // Processor |
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[c18bf9e] | 146 | void main(processorCtx_t &); |
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| 147 | static inline coroutine$* get_coroutine(processorCtx_t & this) { return &this.self; } |
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[85b1deb] | 148 | |
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[8c50aed] | 149 | void * __create_pthread( pthread_t *, void * (*)(void *), void * ); |
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[bfcf6b9] | 150 | void __destroy_pthread( pthread_t pthread, void * stack, void ** retval ); |
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[1805b1b] | 151 | |
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[6502a2b] | 152 | extern cluster * mainCluster; |
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| 153 | |
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[75f3522] | 154 | //----------------------------------------------------------------------------- |
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| 155 | // Threads |
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| 156 | extern "C" { |
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[c7a900a] | 157 | void __cfactx_invoke_thread(void (*main)(void *), void * this); |
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[75f3522] | 158 | } |
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| 159 | |
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[f7d6bb0] | 160 | __cfaabi_dbg_debug_do( |
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[e84ab3d] | 161 | extern void __cfaabi_dbg_thread_register ( thread$ * thrd ); |
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| 162 | extern void __cfaabi_dbg_thread_unregister( thread$ * thrd ); |
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[f7d6bb0] | 163 | ) |
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| 164 | |
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[6a77224] | 165 | #define TICKET_BLOCKED (-1) // thread is blocked |
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| 166 | #define TICKET_RUNNING ( 0) // thread is running |
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| 167 | #define TICKET_UNBLOCK ( 1) // thread should ignore next block |
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[28372f7] | 168 | #define TICKET_DEAD (0xDEAD) // thread should never be unparked |
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[6a77224] | 169 | |
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[969b3fe] | 170 | //----------------------------------------------------------------------------- |
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| 171 | // Utils |
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[e84ab3d] | 172 | void doregister( struct cluster * cltr, struct thread$ & thrd ); |
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| 173 | void unregister( struct cluster * cltr, struct thread$ & thrd ); |
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[de94a60] | 174 | |
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[f00b26d4] | 175 | //----------------------------------------------------------------------------- |
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| 176 | // I/O |
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[8bee858] | 177 | io_arbiter$ * create(void); |
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| 178 | void destroy(io_arbiter$ *); |
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[f00b26d4] | 179 | |
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[7768b8d] | 180 | //======================================================================= |
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| 181 | // Cluster lock API |
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| 182 | //======================================================================= |
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| 183 | // Lock-Free registering/unregistering of threads |
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| 184 | // Register a processor to a given cluster and get its unique id in return |
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[c993b15] | 185 | unsigned register_proc_id( void ); |
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[7768b8d] | 186 | |
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| 187 | // Unregister a processor from a given cluster using its id, getting back the original pointer |
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[c993b15] | 188 | void unregister_proc_id( unsigned ); |
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[7768b8d] | 189 | |
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| 190 | //======================================================================= |
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| 191 | // Reader-writer lock implementation |
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| 192 | // Concurrent with doregister/unregister, |
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| 193 | // i.e., threads can be added at any point during or between the entry/exit |
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[dca5802] | 194 | |
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| 195 | //----------------------------------------------------------------------- |
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| 196 | // simple spinlock underlying the RWLock |
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| 197 | // Blocking acquire |
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[7768b8d] | 198 | static inline void __atomic_acquire(volatile bool * ll) { |
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[2284d20] | 199 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 200 | /* paranoid */ verify(ll); |
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| 201 | |
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[7768b8d] | 202 | while( __builtin_expect(__atomic_exchange_n(ll, (bool)true, __ATOMIC_SEQ_CST), false) ) { |
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| 203 | while(__atomic_load_n(ll, (int)__ATOMIC_RELAXED)) |
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[fd9b524] | 204 | Pause(); |
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[7768b8d] | 205 | } |
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| 206 | /* paranoid */ verify(*ll); |
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[2284d20] | 207 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[7768b8d] | 208 | } |
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| 209 | |
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[dca5802] | 210 | // Non-Blocking acquire |
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[7768b8d] | 211 | static inline bool __atomic_try_acquire(volatile bool * ll) { |
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[2284d20] | 212 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 213 | /* paranoid */ verify(ll); |
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| 214 | |
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[b798713] | 215 | return !__atomic_exchange_n(ll, (bool)true, __ATOMIC_SEQ_CST); |
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[7768b8d] | 216 | } |
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| 217 | |
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[dca5802] | 218 | // Release |
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[7768b8d] | 219 | static inline void __atomic_unlock(volatile bool * ll) { |
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[2284d20] | 220 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 221 | /* paranoid */ verify(ll); |
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[7768b8d] | 222 | /* paranoid */ verify(*ll); |
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| 223 | __atomic_store_n(ll, (bool)false, __ATOMIC_RELEASE); |
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| 224 | } |
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| 225 | |
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[b388ee81] | 226 | //----------------------------------------------------------------------- |
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| 227 | // Reader-Writer lock protecting the ready-queues |
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| 228 | // while this lock is mostly generic some aspects |
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| 229 | // have been hard-coded to for the ready-queue for |
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| 230 | // simplicity and performance |
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[741e22c] | 231 | union __attribute__((aligned(64))) __scheduler_RWLock_t { |
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| 232 | struct { |
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[cd3fc46] | 233 | __attribute__((aligned(64))) char padding; |
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| 234 | |
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[741e22c] | 235 | // total cachelines allocated |
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[cd3fc46] | 236 | __attribute__((aligned(64))) unsigned int max; |
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[b388ee81] | 237 | |
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[741e22c] | 238 | // cachelines currently in use |
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| 239 | volatile unsigned int alloc; |
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[b388ee81] | 240 | |
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[741e22c] | 241 | // cachelines ready to itereate over |
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| 242 | // (!= to alloc when thread is in second half of doregister) |
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| 243 | volatile unsigned int ready; |
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[b388ee81] | 244 | |
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[741e22c] | 245 | // writer lock |
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| 246 | volatile bool write_lock; |
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[b388ee81] | 247 | |
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[741e22c] | 248 | // data pointer |
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| 249 | volatile bool * volatile * data; |
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| 250 | } lock; |
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| 251 | char pad[192]; |
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[b388ee81] | 252 | }; |
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| 253 | |
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| 254 | void ?{}(__scheduler_RWLock_t & this); |
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| 255 | void ^?{}(__scheduler_RWLock_t & this); |
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| 256 | |
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[cd3fc46] | 257 | extern __scheduler_RWLock_t __scheduler_lock; |
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[b388ee81] | 258 | |
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[7768b8d] | 259 | //----------------------------------------------------------------------- |
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| 260 | // Reader side : acquire when using the ready queue to schedule but not |
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| 261 | // creating/destroying queues |
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[cd3fc46] | 262 | static inline void ready_schedule_lock(void) with(__scheduler_lock.lock) { |
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[8fc652e0] | 263 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[c993b15] | 264 | /* paranoid */ verify( ! kernelTLS().in_sched_lock ); |
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| 265 | /* paranoid */ verify( data[kernelTLS().sched_id] == &kernelTLS().sched_lock ); |
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| 266 | /* paranoid */ verify( !kernelTLS().this_processor || kernelTLS().this_processor->unique_id == kernelTLS().sched_id ); |
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[7768b8d] | 267 | |
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| 268 | // Step 1 : make sure no writer are in the middle of the critical section |
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[c993b15] | 269 | while(__atomic_load_n(&write_lock, (int)__ATOMIC_RELAXED)) |
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[fd9b524] | 270 | Pause(); |
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[7768b8d] | 271 | |
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| 272 | // Fence needed because we don't want to start trying to acquire the lock |
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| 273 | // before we read a false. |
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| 274 | // Not needed on x86 |
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| 275 | // std::atomic_thread_fence(std::memory_order_seq_cst); |
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| 276 | |
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| 277 | // Step 2 : acquire our local lock |
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[c993b15] | 278 | __atomic_acquire( &kernelTLS().sched_lock ); |
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| 279 | /*paranoid*/ verify(kernelTLS().sched_lock); |
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[64a7146] | 280 | |
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| 281 | #ifdef __CFA_WITH_VERIFY__ |
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| 282 | // Debug, check if this is owned for reading |
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[c993b15] | 283 | kernelTLS().in_sched_lock = true; |
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[64a7146] | 284 | #endif |
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[7768b8d] | 285 | } |
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| 286 | |
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[cd3fc46] | 287 | static inline void ready_schedule_unlock(void) with(__scheduler_lock.lock) { |
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[8fc652e0] | 288 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[c993b15] | 289 | /* paranoid */ verify( data[kernelTLS().sched_id] == &kernelTLS().sched_lock ); |
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| 290 | /* paranoid */ verify( !kernelTLS().this_processor || kernelTLS().this_processor->unique_id == kernelTLS().sched_id ); |
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| 291 | /* paranoid */ verify( kernelTLS().sched_lock ); |
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| 292 | /* paranoid */ verify( kernelTLS().in_sched_lock ); |
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[64a7146] | 293 | #ifdef __CFA_WITH_VERIFY__ |
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| 294 | // Debug, check if this is owned for reading |
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[c993b15] | 295 | kernelTLS().in_sched_lock = false; |
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[64a7146] | 296 | #endif |
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[c993b15] | 297 | __atomic_unlock(&kernelTLS().sched_lock); |
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[7768b8d] | 298 | } |
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| 299 | |
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[64a7146] | 300 | #ifdef __CFA_WITH_VERIFY__ |
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[e873838] | 301 | static inline bool ready_schedule_islocked(void) { |
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[8fc652e0] | 302 | /* paranoid */ verify( ! __preemption_enabled() ); |
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[c993b15] | 303 | /* paranoid */ verify( (!kernelTLS().in_sched_lock) || kernelTLS().sched_lock ); |
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| 304 | return kernelTLS().sched_lock; |
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[64a7146] | 305 | } |
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| 306 | |
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| 307 | static inline bool ready_mutate_islocked() { |
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[cd3fc46] | 308 | return __scheduler_lock.lock.write_lock; |
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[64a7146] | 309 | } |
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| 310 | #endif |
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| 311 | |
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[7768b8d] | 312 | //----------------------------------------------------------------------- |
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| 313 | // Writer side : acquire when changing the ready queue, e.g. adding more |
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| 314 | // queues or removing them. |
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[b388ee81] | 315 | uint_fast32_t ready_mutate_lock( void ); |
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[7768b8d] | 316 | |
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[b388ee81] | 317 | void ready_mutate_unlock( uint_fast32_t /* value returned by lock */ ); |
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[7768b8d] | 318 | |
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[a33c113] | 319 | //----------------------------------------------------------------------- |
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| 320 | // Lock-Free registering/unregistering of threads |
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| 321 | // Register a processor to a given cluster and get its unique id in return |
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| 322 | // For convenience, also acquires the lock |
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[c993b15] | 323 | static inline [unsigned, uint_fast32_t] ready_mutate_register() { |
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| 324 | unsigned id = register_proc_id(); |
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| 325 | uint_fast32_t last = ready_mutate_lock(); |
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| 326 | return [id, last]; |
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[a33c113] | 327 | } |
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| 328 | |
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| 329 | // Unregister a processor from a given cluster using its id, getting back the original pointer |
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| 330 | // assumes the lock is acquired |
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[c993b15] | 331 | static inline void ready_mutate_unregister( unsigned id, uint_fast32_t last_s ) { |
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[a33c113] | 332 | ready_mutate_unlock( last_s ); |
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[c993b15] | 333 | unregister_proc_id( id ); |
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[a33c113] | 334 | } |
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| 335 | |
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[a7504db] | 336 | //----------------------------------------------------------------------- |
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| 337 | // Cluster idle lock/unlock |
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[6a9b12b] | 338 | static inline void lock(__cluster_proc_list & this) { |
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[a7504db] | 339 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 340 | |
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| 341 | // Start by locking the global RWlock so that we know no-one is |
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| 342 | // adding/removing processors while we mess with the idle lock |
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| 343 | ready_schedule_lock(); |
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| 344 | |
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[a633f6f] | 345 | lock( this.lock __cfaabi_dbg_ctx2 ); |
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[a7504db] | 346 | |
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| 347 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 348 | } |
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| 349 | |
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[5f5a729] | 350 | static inline bool try_lock(__cluster_proc_list & this) { |
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| 351 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 352 | |
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| 353 | // Start by locking the global RWlock so that we know no-one is |
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| 354 | // adding/removing processors while we mess with the idle lock |
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| 355 | ready_schedule_lock(); |
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| 356 | |
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[a633f6f] | 357 | if(try_lock( this.lock __cfaabi_dbg_ctx2 )) { |
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[5f5a729] | 358 | // success |
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| 359 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 360 | return true; |
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| 361 | } |
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| 362 | |
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| 363 | // failed to lock |
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| 364 | ready_schedule_unlock(); |
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| 365 | |
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| 366 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 367 | return false; |
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| 368 | } |
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| 369 | |
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[6a9b12b] | 370 | static inline void unlock(__cluster_proc_list & this) { |
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[a7504db] | 371 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 372 | |
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[a633f6f] | 373 | unlock(this.lock); |
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[a7504db] | 374 | |
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| 375 | // Release the global lock, which we acquired when locking |
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| 376 | ready_schedule_unlock(); |
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| 377 | |
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| 378 | /* paranoid */ verify( ! __preemption_enabled() ); |
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| 379 | } |
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| 380 | |
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[b798713] | 381 | //======================================================================= |
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| 382 | // Ready-Queue API |
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[dca5802] | 383 | //----------------------------------------------------------------------- |
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| 384 | // push thread onto a ready queue for a cluster |
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| 385 | // returns true if the list was previously empty, false otherwise |
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[24e321c] | 386 | __attribute__((hot)) void push(struct cluster * cltr, struct thread$ * thrd, unpark_hint hint); |
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[dca5802] | 387 | |
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| 388 | //----------------------------------------------------------------------- |
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[fc59df78] | 389 | // pop thread from the local queues of a cluster |
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[dca5802] | 390 | // returns 0p if empty |
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[1eb239e4] | 391 | // May return 0p spuriously |
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[e84ab3d] | 392 | __attribute__((hot)) struct thread$ * pop_fast(struct cluster * cltr); |
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[dca5802] | 393 | |
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[1eb239e4] | 394 | //----------------------------------------------------------------------- |
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[fc59df78] | 395 | // pop thread from any ready queue of a cluster |
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[1eb239e4] | 396 | // returns 0p if empty |
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[fc59df78] | 397 | // May return 0p spuriously |
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[e84ab3d] | 398 | __attribute__((hot)) struct thread$ * pop_slow(struct cluster * cltr); |
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[1eb239e4] | 399 | |
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[fc59df78] | 400 | //----------------------------------------------------------------------- |
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| 401 | // search all ready queues of a cluster for any thread |
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| 402 | // returns 0p if empty |
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| 403 | // guaranteed to find any threads added before this call |
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[e84ab3d] | 404 | __attribute__((hot)) struct thread$ * pop_search(struct cluster * cltr); |
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[fc59df78] | 405 | |
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[24e321c] | 406 | //----------------------------------------------------------------------- |
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| 407 | // get preferred ready for new thread |
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| 408 | unsigned ready_queue_new_preferred(); |
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| 409 | |
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[dca5802] | 410 | //----------------------------------------------------------------------- |
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| 411 | // Increase the width of the ready queue (number of lanes) by 4 |
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[a017ee7] | 412 | void ready_queue_grow (struct cluster * cltr); |
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[dca5802] | 413 | |
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| 414 | //----------------------------------------------------------------------- |
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| 415 | // Decrease the width of the ready queue (number of lanes) by 4 |
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[a017ee7] | 416 | void ready_queue_shrink(struct cluster * cltr); |
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[b798713] | 417 | |
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[884f3f67] | 418 | //----------------------------------------------------------------------- |
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| 419 | // Decrease the width of the ready queue (number of lanes) by 4 |
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| 420 | void ready_queue_close(struct cluster * cltr); |
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| 421 | |
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[75f3522] | 422 | // Local Variables: // |
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| 423 | // mode: c // |
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| 424 | // tab-width: 4 // |
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[4aa2fb2] | 425 | // End: // |
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