source: libcfa/src/concurrency/kernel.hfa @ 431cd4f

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since 431cd4f was 431cd4f, checked in by Thierry Delisle <tdelisle@…>, 8 months ago

Added alternative to relaxed-fifo scheduler.
Disabled by default

  • Property mode set to 100644
File size: 8.5 KB
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1//
2// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// kernel -- Header containing the core of the kernel API
8//
9// Author           : Thierry Delisle
10// Created On       : Tue Jan 17 12:27:26 2017
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Tue Feb  4 12:29:26 2020
13// Update Count     : 22
14//
15
16#pragma once
17
18#include "invoke.h"
19#include "time_t.hfa"
20#include "coroutine.hfa"
21
22#include "containers/list.hfa"
23
24extern "C" {
25        #include <bits/pthreadtypes.h>
26        #include <pthread.h>
27        #include <linux/types.h>
28}
29
30#ifdef __CFA_WITH_VERIFY__
31        extern bool __cfaabi_dbg_in_kernel();
32#endif
33
34//-----------------------------------------------------------------------------
35// I/O
36struct cluster;
37struct $io_context;
38struct $io_arbiter;
39
40struct io_context_params {
41        int num_entries;
42};
43
44void  ?{}(io_context_params & this);
45
46//-----------------------------------------------------------------------------
47// Processor
48extern struct cluster * mainCluster;
49
50// Processor id, required for scheduling threads
51struct __processor_id_t {
52        unsigned id:24;
53
54        #if !defined(__CFA_NO_STATISTICS__)
55                struct __stats_t * stats;
56        #endif
57};
58
59coroutine processorCtx_t {
60        struct processor * proc;
61};
62
63// Wrapper around kernel threads
64struct __attribute__((aligned(128))) processor {
65        // Main state
66        inline __processor_id_t;
67
68        // Cluster from which to get threads
69        struct cluster * cltr;
70
71        // Ready Queue state per processor
72        struct {
73                unsigned short its;
74                unsigned short itr;
75                unsigned id;
76                unsigned target;
77                unsigned long long int cutoff;
78        } rdq;
79
80        // Set to true to notify the processor should terminate
81        volatile bool do_terminate;
82
83        // Coroutine ctx who does keeps the state of the processor
84        struct processorCtx_t runner;
85
86        // Name of the processor
87        const char * name;
88
89        // Handle to pthreads
90        pthread_t kernel_thread;
91
92        struct {
93                $io_context * ctx;
94                bool pending;
95                bool dirty;
96        } io;
97
98        // Preemption data
99        // Node which is added in the discrete event simulaiton
100        struct alarm_node_t * preemption_alarm;
101
102        // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
103        bool pending_preemption;
104
105        // Idle lock (kernel semaphore)
106        int idle;
107
108        // Termination synchronisation (user semaphore)
109        oneshot terminated;
110
111        // pthread Stack
112        void * stack;
113
114        // Link lists fields
115        DLISTED_MGD_IMPL_IN(processor)
116
117        // special init fields
118        // This is needed for memcached integration
119        // once memcached experiments are done this should probably be removed
120        // it is not a particularly safe scheme as it can make processors less homogeneous
121        struct {
122                $thread * thrd;
123        } init;
124
125        #if !defined(__CFA_NO_STATISTICS__)
126                int print_stats;
127                bool print_halts;
128        #endif
129
130#ifdef __CFA_DEBUG__
131        // Last function to enable preemption on this processor
132        const char * last_enable;
133#endif
134};
135
136void  ?{}(processor & this, const char name[], struct cluster & cltr);
137void ^?{}(processor & this);
138
139static inline void  ?{}(processor & this)                        { this{ "Anonymous Processor", *mainCluster}; }
140static inline void  ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
141static inline void  ?{}(processor & this, const char name[])     { this{name, *mainCluster}; }
142
143DLISTED_MGD_IMPL_OUT(processor)
144
145//-----------------------------------------------------------------------------
146// Cluster Tools
147
148// Intrusives lanes which are used by the ready queue
149struct __attribute__((aligned(128))) __intrusive_lane_t;
150void  ?{}(__intrusive_lane_t & this);
151void ^?{}(__intrusive_lane_t & this);
152
153// Aligned timestamps which are used by the relaxed ready queue
154struct __attribute__((aligned(128))) __timestamp_t;
155void  ?{}(__timestamp_t & this);
156void ^?{}(__timestamp_t & this);
157
158//TODO adjust cache size to ARCHITECTURE
159// Structure holding the relaxed ready queue
160struct __ready_queue_t {
161        // Data tracking the actual lanes
162        // On a seperate cacheline from the used struct since
163        // used can change on each push/pop but this data
164        // only changes on shrink/grow
165        struct {
166                // Arary of lanes
167                __intrusive_lane_t * volatile data;
168
169                // Array of times
170                __timestamp_t * volatile tscs;
171
172                // Number of lanes (empty or not)
173                volatile size_t count;
174        } lanes;
175};
176
177void  ?{}(__ready_queue_t & this);
178void ^?{}(__ready_queue_t & this);
179
180// Idle Sleep
181struct __cluster_proc_list {
182        // Spin lock protecting the queue
183        volatile uint64_t lock;
184
185        // Total number of processors
186        unsigned total;
187
188        // Total number of idle processors
189        unsigned idle;
190
191        // List of idle processors
192        dlist(processor, processor) idles;
193
194        // List of active processors
195        dlist(processor, processor) actives;
196};
197
198//-----------------------------------------------------------------------------
199// Cluster
200struct __attribute__((aligned(128))) cluster {
201        // Ready queue for threads
202        __ready_queue_t ready_queue;
203
204        // Name of the cluster
205        const char * name;
206
207        // Preemption rate on this cluster
208        Duration preemption_rate;
209
210        // List of idle processors
211        __cluster_proc_list procs;
212
213        // List of threads
214        __spinlock_t thread_list_lock;
215        __dllist_t(struct $thread) threads;
216        unsigned int nthreads;
217
218        // Link lists fields
219        struct __dbg_node_cltr {
220                cluster * next;
221                cluster * prev;
222        } node;
223
224        struct {
225                $io_arbiter * arbiter;
226                io_context_params params;
227        } io;
228
229        #if !defined(__CFA_NO_STATISTICS__)
230                struct __stats_t * stats;
231                int print_stats;
232        #endif
233};
234extern Duration default_preemption();
235
236void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
237void ^?{}(cluster & this);
238
239static inline void ?{} (cluster & this)                                            { io_context_params default_params;    this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
240static inline void ?{} (cluster & this, Duration preemption_rate)                  { io_context_params default_params;    this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
241static inline void ?{} (cluster & this, const char name[])                         { io_context_params default_params;    this{name, default_preemption(), 1, default_params}; }
242static inline void ?{} (cluster & this, unsigned num_io)                           { io_context_params default_params;    this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
243static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params;    this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
244static inline void ?{} (cluster & this, const char name[], unsigned num_io)        { io_context_params default_params;    this{name, default_preemption(), num_io, default_params}; }
245static inline void ?{} (cluster & this, const io_context_params & io_params)                                            { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
246static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params)                  { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
247static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params)                         { this{name, default_preemption(), 1, io_params}; }
248static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params)                           { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
249static 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}; }
250static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params)        { this{name, default_preemption(), num_io, io_params}; }
251
252static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
253
254static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
255static inline struct cluster   * active_cluster  () { return publicTLS_get( this_processor )->cltr; }
256
257#if !defined(__CFA_NO_STATISTICS__)
258        void print_stats_now( cluster & this, int flags );
259
260        static inline void print_stats_at_exit( cluster & this, int flags ) {
261                this.print_stats |= flags;
262        }
263
264        static inline void print_stats_at_exit( processor & this, int flags ) {
265                this.print_stats |= flags;
266        }
267
268        void print_halts( processor & this );
269#endif
270
271// Local Variables: //
272// mode: c //
273// tab-width: 4 //
274// End: //
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