source: libcfa/src/concurrency/kernel.hfa@ 986cb99

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 986cb99 was 431cd4f, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Added alternative to relaxed-fifo scheduler.
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  • 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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