| 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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| 7 | // kernel -- Header containing the core of the kernel API
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| 8 | //
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| 9 | // Author : Thierry Delisle
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| 10 | // Created On : Tue Jan 17 12:27:26 2017
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| 11 | // Last Modified By : Peter A. Buhr
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| 12 | // Last Modified On : Tue Feb 4 12:29:26 2020
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| 13 | // Update Count : 22
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| 14 | //
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| 15 |
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| 16 | #pragma once
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| 17 |
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| 18 | #include "invoke.h"
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| 19 | #include "time_t.hfa"
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| 20 | #include "coroutine.hfa"
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| 21 |
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| 22 | #include "containers/list.hfa"
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| 23 |
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| 24 | extern "C" {
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| 25 | #include <bits/pthreadtypes.h>
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| 26 | #include <pthread.h>
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| 27 | #include <linux/types.h>
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| 28 | }
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| 29 |
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| 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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| 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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| 46 | //-----------------------------------------------------------------------------
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| 47 | // Processor
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| 48 | extern struct cluster * mainCluster;
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| 49 |
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| 50 | // Coroutine used py processors for the 2-step context switch
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| 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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| 55 | struct io_future_t;
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| 56 |
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| 57 | // Information needed for idle sleep
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| 58 | struct __fd_waitctx {
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| 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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| 76 | };
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| 77 |
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| 78 | // Wrapper around kernel threads
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| 79 | struct __attribute__((aligned(128))) processor {
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| 80 | // Cluster from which to get threads
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| 81 | struct cluster * cltr;
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| 82 |
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| 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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| 89 | unsigned last;
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| 90 | signed cpu;
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| 91 | } rdq;
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| 92 |
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| 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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| 99 | // Name of the processor
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| 100 | const char * name;
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| 101 |
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| 102 | // Handle to pthreads
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| 103 | pthread_t kernel_thread;
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| 104 |
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| 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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| 108 | struct {
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| 109 | $io_context * ctx;
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| 110 | volatile bool pending;
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| 111 | volatile bool dirty;
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| 112 | } io;
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| 113 |
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| 114 | // Preemption data
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| 115 | // Node which is added in the discrete event simulaiton
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| 116 | struct alarm_node_t * preemption_alarm;
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| 117 |
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| 118 | // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
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| 119 | bool pending_preemption;
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| 120 |
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| 121 | // context for idle sleep
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| 122 | struct __fd_waitctx idle_wctx;
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| 123 |
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| 124 | // Termination synchronisation (user semaphore)
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| 125 | oneshot terminated;
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| 126 |
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| 127 | // pthread Stack
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| 128 | void * stack;
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| 129 |
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| 130 | // Link lists fields
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| 131 | inline dlink(processor);
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| 132 |
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| 133 | // special init fields
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| 134 | // This is needed for memcached integration
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| 135 | // once memcached experiments are done this should probably be removed
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| 136 | // it is not a particularly safe scheme as it can make processors less homogeneous
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| 137 | struct {
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| 138 | thread$ * thrd;
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| 139 | } init;
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| 140 |
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| 141 | struct KernelThreadData * local_data;
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| 142 |
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| 143 | #if !defined(__CFA_NO_STATISTICS__)
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| 144 | int print_stats;
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| 145 | bool print_halts;
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| 146 | #endif
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| 147 |
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| 148 | #ifdef __CFA_DEBUG__
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| 149 | // Last function to enable preemption on this processor
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| 150 | const char * last_enable;
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| 151 | #endif
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| 152 | };
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| 153 | P9_EMBEDDED( processor, dlink(processor) )
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| 154 |
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| 155 | void ?{}(processor & this, const char name[], struct cluster & cltr);
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| 156 | void ^?{}(processor & this);
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| 157 |
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| 158 | static inline void ?{}(processor & this) { this{ "Anonymous Processor", *mainCluster}; }
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| 159 | static inline void ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
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| 160 | static inline void ?{}(processor & this, const char name[]) { this{name, *mainCluster}; }
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| 161 |
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| 162 | //-----------------------------------------------------------------------------
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| 163 | // Cluster Tools
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| 164 |
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| 165 | // Intrusives lanes which are used by the ready queue
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| 166 | struct __attribute__((aligned(128))) __intrusive_lane_t;
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| 167 | void ?{}(__intrusive_lane_t & this);
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| 168 | void ^?{}(__intrusive_lane_t & this);
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| 169 |
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| 170 | // Aligned timestamps which are used by the ready queue and io subsystem
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| 171 | struct __attribute__((aligned(128))) __timestamp_t {
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| 172 | volatile unsigned long long tv;
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| 173 | volatile unsigned long long ma;
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| 174 | };
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| 175 |
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| 176 | static inline void ?{}(__timestamp_t & this) { this.tv = 0; this.ma = 0; }
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| 177 | static inline void ^?{}(__timestamp_t &) {}
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| 178 |
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| 179 |
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| 180 | struct __attribute__((aligned(16))) __cache_id_t {
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| 181 | volatile unsigned id;
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| 182 | };
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| 183 |
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| 184 | // Idle Sleep
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| 185 | struct __cluster_proc_list {
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| 186 | // Spin lock protecting the queue
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| 187 | __spinlock_t lock;
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| 188 |
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| 189 | // FD to use to wake a processor
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| 190 | struct __fd_waitctx * volatile fdw;
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| 191 |
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| 192 | // Total number of processors
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| 193 | unsigned total;
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| 194 |
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| 195 | // Total number of idle processors
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| 196 | unsigned idle;
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| 197 |
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| 198 | // List of idle processors
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| 199 | dlist(processor) idles;
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| 200 |
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| 201 | // List of active processors
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| 202 | dlist(processor) actives;
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| 203 | };
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| 204 |
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| 205 | //-----------------------------------------------------------------------------
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| 206 | // Cluster
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| 207 | struct __attribute__((aligned(128))) cluster {
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| 208 | struct {
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| 209 | struct {
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| 210 | // Arary of subqueues
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| 211 | __intrusive_lane_t * volatile data;
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| 212 |
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| 213 | // Time since subqueues were processed
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| 214 | __timestamp_t * volatile tscs;
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| 215 |
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| 216 | // Number of subqueue / timestamps
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| 217 | size_t count;
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| 218 | } readyQ;
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| 219 |
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| 220 | struct {
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| 221 | // Time since subqueues were processed
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| 222 | __timestamp_t * volatile tscs;
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| 223 |
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| 224 | // Number of I/O subqueues
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| 225 | size_t count;
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| 226 | } io;
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| 227 |
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| 228 | // Cache each kernel thread belongs to
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| 229 | __cache_id_t * volatile caches;
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| 230 | } sched;
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| 231 |
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| 232 | // // Ready queue for threads
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| 233 | // __ready_queue_t ready_queue;
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| 234 |
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| 235 | // Name of the cluster
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| 236 | const char * name;
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| 237 |
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| 238 | // Preemption rate on this cluster
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| 239 | Duration preemption_rate;
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| 240 |
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| 241 | // List of idle processors
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| 242 | __cluster_proc_list procs;
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| 243 |
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| 244 | // List of threads
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| 245 | __spinlock_t thread_list_lock;
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| 246 | __dllist_t(struct thread$) threads;
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| 247 | unsigned int nthreads;
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| 248 |
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| 249 | // Link lists fields
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| 250 | struct __dbg_node_cltr {
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| 251 | cluster * next;
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| 252 | cluster * prev;
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| 253 | } node;
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| 254 |
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| 255 | struct {
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| 256 | $io_arbiter * arbiter;
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| 257 | io_context_params params;
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| 258 | } io;
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| 259 |
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| 260 | #if !defined(__CFA_NO_STATISTICS__)
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| 261 | struct __stats_t * stats;
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| 262 | int print_stats;
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| 263 | #endif
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| 264 | };
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| 265 | extern Duration default_preemption();
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| 266 |
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| 267 | void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
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| 268 | void ^?{}(cluster & this);
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| 269 |
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| 270 | static inline void ?{} (cluster & this) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
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| 271 | 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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| 272 | static inline void ?{} (cluster & this, const char name[]) { io_context_params default_params; this{name, default_preemption(), 1, default_params}; }
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| 273 | 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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| 274 | 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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| 275 | 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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| 276 | static inline void ?{} (cluster & this, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
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| 277 | 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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| 278 | 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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| 279 | 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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| 280 | 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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| 281 | 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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| 282 |
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| 283 | static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
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| 284 |
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| 285 | static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
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| 286 | static inline struct cluster * active_cluster () { return publicTLS_get( this_processor )->cltr; }
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| 287 |
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| 288 | #if !defined(__CFA_NO_STATISTICS__)
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| 289 | void print_stats_now( cluster & this, int flags );
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| 290 |
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| 291 | static inline void print_stats_at_exit( cluster & this, int flags ) {
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| 292 | this.print_stats |= flags;
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| 293 | }
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| 294 |
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| 295 | static inline void print_stats_at_exit( processor & this, int flags ) {
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| 296 | this.print_stats |= flags;
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| 297 | }
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| 298 |
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| 299 | void print_halts( processor & this );
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| 300 | #endif
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| 301 |
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| 302 | // Local Variables: //
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| 303 | // mode: c //
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| 304 | // tab-width: 4 //
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| 305 | // End: //
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