[8118303] | 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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[454f478] | 7 | // kernel -- Header containing the core of the kernel API |
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[8118303] | 8 | // |
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| 9 | // Author : Thierry Delisle |
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[75f3522] | 10 | // Created On : Tue Jan 17 12:27:26 2017 |
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[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
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[e3fea42] | 12 | // Last Modified On : Tue Feb 4 12:29:26 2020 |
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| 13 | // Update Count : 22 |
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[8118303] | 14 | // |
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| 15 | |
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[6b0b624] | 16 | #pragma once |
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[8118303] | 17 | |
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[bd98b58] | 18 | #include "invoke.h" |
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[73abe95] | 19 | #include "time_t.hfa" |
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[d76bd79] | 20 | #include "coroutine.hfa" |
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[bd98b58] | 21 | |
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[1eb239e4] | 22 | #include "containers/list.hfa" |
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[64a7146] | 23 | |
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[8def349] | 24 | extern "C" { |
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[c402739f] | 25 | #include <bits/pthreadtypes.h> |
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[454f478] | 26 | #include <pthread.h> |
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[c402739f] | 27 | #include <linux/types.h> |
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[8def349] | 28 | } |
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| 29 | |
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[454f478] | 30 | #ifdef __CFA_WITH_VERIFY__ |
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| 31 | extern bool __cfaabi_dbg_in_kernel(); |
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| 32 | #endif |
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| 33 | |
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[78da4ab] | 34 | //----------------------------------------------------------------------------- |
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| 35 | // I/O |
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| 36 | struct cluster; |
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| 37 | struct $io_context; |
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| 38 | struct $io_arbiter; |
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| 39 | |
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| 40 | struct io_context_params { |
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| 41 | int num_entries; |
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| 42 | }; |
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| 43 | |
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| 44 | void ?{}(io_context_params & this); |
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| 45 | |
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[bd98b58] | 46 | //----------------------------------------------------------------------------- |
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[de94a60] | 47 | // Processor |
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[de6319f] | 48 | extern struct cluster * mainCluster; |
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[bd98b58] | 49 | |
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[22226e4] | 50 | // Coroutine used py processors for the 2-step context switch |
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[094476d] | 51 | coroutine processorCtx_t { |
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| 52 | struct processor * proc; |
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| 53 | }; |
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| 54 | |
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[22226e4] | 55 | struct io_future_t; |
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[7cf3b1d] | 56 | |
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[22226e4] | 57 | // Information needed for idle sleep |
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[7cf3b1d] | 58 | struct __fd_waitctx { |
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[22226e4] | 59 | // semaphore/future like object |
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| 60 | // values can be 0, 1 or some file descriptor. |
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| 61 | // 0 - is the default state |
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| 62 | // 1 - means the proc should wake-up immediately |
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| 63 | // FD - means the proc is going asleep and should be woken by writing to the FD. |
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| 64 | volatile int sem; |
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| 65 | |
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| 66 | // The event FD that corresponds to this processor |
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| 67 | int evfd; |
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| 68 | |
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| 69 | // buffer into which the proc will read from evfd |
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| 70 | // unused if not using io_uring for idle sleep |
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| 71 | void * rdbuf; |
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| 72 | |
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| 73 | // future use to track the read of the eventfd |
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| 74 | // unused if not using io_uring for idle sleep |
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| 75 | io_future_t * ftr; |
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[7cf3b1d] | 76 | }; |
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| 77 | |
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[e60e0dc] | 78 | // Wrapper around kernel threads |
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[37ba662] | 79 | struct __attribute__((aligned(128))) processor { |
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[025278e] | 80 | // Cluster from which to get threads |
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[de94a60] | 81 | struct cluster * cltr; |
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[025278e] | 82 | |
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[431cd4f] | 83 | // Ready Queue state per processor |
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| 84 | struct { |
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| 85 | unsigned short its; |
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| 86 | unsigned short itr; |
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| 87 | unsigned id; |
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| 88 | unsigned target; |
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[12daa43] | 89 | unsigned last; |
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[a2a4566] | 90 | signed cpu; |
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[431cd4f] | 91 | } rdq; |
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[bd0bdd37] | 92 | |
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[37ba662] | 93 | // Set to true to notify the processor should terminate |
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| 94 | volatile bool do_terminate; |
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| 95 | |
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| 96 | // Coroutine ctx who does keeps the state of the processor |
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| 97 | struct processorCtx_t runner; |
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| 98 | |
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[de6319f] | 99 | // Name of the processor |
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| 100 | const char * name; |
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| 101 | |
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[025278e] | 102 | // Handle to pthreads |
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| 103 | pthread_t kernel_thread; |
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[2ac095d] | 104 | |
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[c993b15] | 105 | // Unique id for the processor (not per cluster) |
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| 106 | unsigned unique_id; |
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| 107 | |
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[78da4ab] | 108 | struct { |
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[dddb3dd0] | 109 | $io_context * ctx; |
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[adb3ea1] | 110 | unsigned id; |
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| 111 | unsigned target; |
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[d529ad0] | 112 | volatile bool pending; |
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| 113 | volatile bool dirty; |
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[78da4ab] | 114 | } io; |
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| 115 | |
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[e60e0dc] | 116 | // Preemption data |
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[025278e] | 117 | // Node which is added in the discrete event simulaiton |
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| 118 | struct alarm_node_t * preemption_alarm; |
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| 119 | |
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| 120 | // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible |
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| 121 | bool pending_preemption; |
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[c81ebf9] | 122 | |
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[22226e4] | 123 | // context for idle sleep |
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[7cf3b1d] | 124 | struct __fd_waitctx idle_wctx; |
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| 125 | |
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[92e7631] | 126 | // Termination synchronisation (user semaphore) |
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[454f478] | 127 | oneshot terminated; |
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[de94a60] | 128 | |
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[27f5f71] | 129 | // pthread Stack |
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| 130 | void * stack; |
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| 131 | |
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[de94a60] | 132 | // Link lists fields |
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[69914cbc] | 133 | inline dlink(processor); |
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[14a61b5] | 134 | |
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[a1538cd] | 135 | // special init fields |
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| 136 | // This is needed for memcached integration |
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| 137 | // once memcached experiments are done this should probably be removed |
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| 138 | // it is not a particularly safe scheme as it can make processors less homogeneous |
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| 139 | struct { |
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[e84ab3d] | 140 | thread$ * thrd; |
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[a1538cd] | 141 | } init; |
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| 142 | |
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[a67c5b6] | 143 | struct KernelThreadData * local_data; |
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| 144 | |
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[c34ebf2] | 145 | #if !defined(__CFA_NO_STATISTICS__) |
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[69fbc61] | 146 | int print_stats; |
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[c34ebf2] | 147 | bool print_halts; |
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| 148 | #endif |
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| 149 | |
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[e60e0dc] | 150 | #ifdef __CFA_DEBUG__ |
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[025278e] | 151 | // Last function to enable preemption on this processor |
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[cdbfab0] | 152 | const char * last_enable; |
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[e60e0dc] | 153 | #endif |
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[c84e80a] | 154 | }; |
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[69914cbc] | 155 | P9_EMBEDDED( processor, dlink(processor) ) |
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[c84e80a] | 156 | |
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[a5e7233] | 157 | void ?{}(processor & this, const char name[], struct cluster & cltr); |
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[242a902] | 158 | void ^?{}(processor & this); |
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[c84e80a] | 159 | |
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[a5e7233] | 160 | static inline void ?{}(processor & this) { this{ "Anonymous Processor", *mainCluster}; } |
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| 161 | static inline void ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; } |
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| 162 | static inline void ?{}(processor & this, const char name[]) { this{name, *mainCluster}; } |
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[de6319f] | 163 | |
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[7768b8d] | 164 | //----------------------------------------------------------------------------- |
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| 165 | // Cluster Tools |
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[dca5802] | 166 | |
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[9cc3a18] | 167 | // Intrusives lanes which are used by the ready queue |
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[61d7bec] | 168 | struct __attribute__((aligned(128))) __intrusive_lane_t; |
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[dca5802] | 169 | void ?{}(__intrusive_lane_t & this); |
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| 170 | void ^?{}(__intrusive_lane_t & this); |
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[7768b8d] | 171 | |
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[884f3f67] | 172 | // Aligned timestamps which are used by the ready queue and io subsystem |
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[8cd40bf] | 173 | struct __attribute__((aligned(128))) __timestamp_t { |
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| 174 | volatile unsigned long long tv; |
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[089d30c] | 175 | volatile unsigned long long ma; |
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[8cd40bf] | 176 | }; |
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| 177 | |
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[089d30c] | 178 | static inline void ?{}(__timestamp_t & this) { this.tv = 0; this.ma = 0; } |
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[a892e61] | 179 | static inline void ^?{}(__timestamp_t &) {} |
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[9cc3a18] | 180 | |
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[dca5802] | 181 | |
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[884f3f67] | 182 | struct __attribute__((aligned(16))) __cache_id_t { |
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| 183 | volatile unsigned id; |
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| 184 | }; |
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[9cc3a18] | 185 | |
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[1eb239e4] | 186 | // Idle Sleep |
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[6a9b12b] | 187 | struct __cluster_proc_list { |
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[1eb239e4] | 188 | // Spin lock protecting the queue |
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[34b8cb7] | 189 | __spinlock_t lock; |
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| 190 | |
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| 191 | // FD to use to wake a processor |
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[7cf3b1d] | 192 | struct __fd_waitctx * volatile fdw; |
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[1eb239e4] | 193 | |
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| 194 | // Total number of processors |
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| 195 | unsigned total; |
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| 196 | |
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| 197 | // Total number of idle processors |
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| 198 | unsigned idle; |
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| 199 | |
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| 200 | // List of idle processors |
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[69914cbc] | 201 | dlist(processor) idles; |
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[fc59b580] | 202 | |
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| 203 | // List of active processors |
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[69914cbc] | 204 | dlist(processor) actives; |
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[1eb239e4] | 205 | }; |
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| 206 | |
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[de94a60] | 207 | //----------------------------------------------------------------------------- |
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| 208 | // Cluster |
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[37ba662] | 209 | struct __attribute__((aligned(128))) cluster { |
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[884f3f67] | 210 | struct { |
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| 211 | struct { |
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| 212 | // Arary of subqueues |
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[adb3ea1] | 213 | __intrusive_lane_t * data; |
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[884f3f67] | 214 | |
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| 215 | // Time since subqueues were processed |
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[adb3ea1] | 216 | __timestamp_t * tscs; |
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[884f3f67] | 217 | |
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| 218 | // Number of subqueue / timestamps |
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| 219 | size_t count; |
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| 220 | } readyQ; |
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| 221 | |
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| 222 | struct { |
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[adb3ea1] | 223 | // Array of $io_ |
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| 224 | $io_context ** data; |
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| 225 | |
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[708ae38] | 226 | // Time since subqueues were processed |
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[adb3ea1] | 227 | __timestamp_t * tscs; |
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[708ae38] | 228 | |
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| 229 | // Number of I/O subqueues |
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| 230 | size_t count; |
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[884f3f67] | 231 | } io; |
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| 232 | |
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| 233 | // Cache each kernel thread belongs to |
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[adb3ea1] | 234 | __cache_id_t * caches; |
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[884f3f67] | 235 | } sched; |
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| 236 | |
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| 237 | // // Ready queue for threads |
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| 238 | // __ready_queue_t ready_queue; |
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[de94a60] | 239 | |
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| 240 | // Name of the cluster |
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| 241 | const char * name; |
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| 242 | |
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| 243 | // Preemption rate on this cluster |
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| 244 | Duration preemption_rate; |
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| 245 | |
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[64a7146] | 246 | // List of idle processors |
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[6a9b12b] | 247 | __cluster_proc_list procs; |
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[de94a60] | 248 | |
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[d4e68a6] | 249 | // List of threads |
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[a1a17a7] | 250 | __spinlock_t thread_list_lock; |
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[e84ab3d] | 251 | __dllist_t(struct thread$) threads; |
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[d4e68a6] | 252 | unsigned int nthreads; |
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[a1a17a7] | 253 | |
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[de94a60] | 254 | // Link lists fields |
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[ea8b2f7] | 255 | struct __dbg_node_cltr { |
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[de94a60] | 256 | cluster * next; |
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| 257 | cluster * prev; |
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| 258 | } node; |
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[92976d9] | 259 | |
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[f00b26d4] | 260 | struct { |
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[78da4ab] | 261 | $io_arbiter * arbiter; |
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| 262 | io_context_params params; |
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[f00b26d4] | 263 | } io; |
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[038be32] | 264 | |
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| 265 | #if !defined(__CFA_NO_STATISTICS__) |
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[8834751] | 266 | struct __stats_t * stats; |
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[69fbc61] | 267 | int print_stats; |
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[038be32] | 268 | #endif |
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[de94a60] | 269 | }; |
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| 270 | extern Duration default_preemption(); |
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| 271 | |
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[f00b26d4] | 272 | void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params); |
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[de94a60] | 273 | void ^?{}(cluster & this); |
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| 274 | |
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[f00b26d4] | 275 | static inline void ?{} (cluster & this) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), 1, default_params}; } |
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| 276 | static inline void ?{} (cluster & this, Duration preemption_rate) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, 1, default_params}; } |
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| 277 | static inline void ?{} (cluster & this, const char name[]) { io_context_params default_params; this{name, default_preemption(), 1, default_params}; } |
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| 278 | static inline void ?{} (cluster & this, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), num_io, default_params}; } |
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| 279 | static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, num_io, default_params}; } |
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| 280 | static inline void ?{} (cluster & this, const char name[], unsigned num_io) { io_context_params default_params; this{name, default_preemption(), num_io, default_params}; } |
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| 281 | static inline void ?{} (cluster & this, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), 1, io_params}; } |
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| 282 | static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, 1, io_params}; } |
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| 283 | static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params) { this{name, default_preemption(), 1, io_params}; } |
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| 284 | static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; } |
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| 285 | static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, num_io, io_params}; } |
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| 286 | static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params) { this{name, default_preemption(), num_io, io_params}; } |
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[de94a60] | 287 | |
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[c7a900a] | 288 | static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; } |
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[de94a60] | 289 | |
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[8fc652e0] | 290 | static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE |
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| 291 | static inline struct cluster * active_cluster () { return publicTLS_get( this_processor )->cltr; } |
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[d4e68a6] | 292 | |
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[038be32] | 293 | #if !defined(__CFA_NO_STATISTICS__) |
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[8fc652e0] | 294 | void print_stats_now( cluster & this, int flags ); |
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| 295 | |
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[69fbc61] | 296 | static inline void print_stats_at_exit( cluster & this, int flags ) { |
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| 297 | this.print_stats |= flags; |
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[038be32] | 298 | } |
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[c34ebf2] | 299 | |
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[69fbc61] | 300 | static inline void print_stats_at_exit( processor & this, int flags ) { |
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| 301 | this.print_stats |= flags; |
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[c34ebf2] | 302 | } |
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| 303 | |
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| 304 | void print_halts( processor & this ); |
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[038be32] | 305 | #endif |
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| 306 | |
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[8118303] | 307 | // Local Variables: // |
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[6b0b624] | 308 | // mode: c // |
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| 309 | // tab-width: 4 // |
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[8118303] | 310 | // End: // |
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