source: libcfa/src/concurrency/kernel.hfa@ d824715

ADT ast-experimental enum pthread-emulation qualifiedEnum
Last change on this file since d824715 was 884f3f67, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Change how the ready queue is initialized to make it common with I/O
  • Property mode set to 100644
File size: 9.3 KB
Line 
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
51
52
53coroutine processorCtx_t {
54 struct processor * proc;
55};
56
57
58struct __fd_waitctx {
59 volatile int fd;
60};
61
62// Wrapper around kernel threads
63struct __attribute__((aligned(128))) processor {
64 // Cluster from which to get threads
65 struct cluster * cltr;
66
67 // Ready Queue state per processor
68 struct {
69 unsigned short its;
70 unsigned short itr;
71 unsigned id;
72 unsigned target;
73 unsigned last;
74 signed cpu;
75 } rdq;
76
77 // Set to true to notify the processor should terminate
78 volatile bool do_terminate;
79
80 // Coroutine ctx who does keeps the state of the processor
81 struct processorCtx_t runner;
82
83 // Name of the processor
84 const char * name;
85
86 // Handle to pthreads
87 pthread_t kernel_thread;
88
89 // Unique id for the processor (not per cluster)
90 unsigned unique_id;
91
92 struct {
93 $io_context * ctx;
94 volatile bool pending;
95 volatile bool dirty;
96 } io;
97
98 // Preemption data
99 // Node which is added in the discrete event simulaiton
100 struct alarm_node_t * preemption_alarm;
101
102 // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
103 bool pending_preemption;
104
105 // Idle lock (kernel semaphore)
106 int idle_fd;
107
108 // Idle waitctx
109 struct __fd_waitctx idle_wctx;
110
111 // Termination synchronisation (user semaphore)
112 oneshot terminated;
113
114 // pthread Stack
115 void * stack;
116
117 // Link lists fields
118 inline dlink(processor);
119
120 // special init fields
121 // This is needed for memcached integration
122 // once memcached experiments are done this should probably be removed
123 // it is not a particularly safe scheme as it can make processors less homogeneous
124 struct {
125 thread$ * thrd;
126 } init;
127
128 struct KernelThreadData * local_data;
129
130 #if !defined(__CFA_NO_STATISTICS__)
131 int print_stats;
132 bool print_halts;
133 #endif
134
135#ifdef __CFA_DEBUG__
136 // Last function to enable preemption on this processor
137 const char * last_enable;
138#endif
139};
140P9_EMBEDDED( processor, dlink(processor) )
141
142void ?{}(processor & this, const char name[], struct cluster & cltr);
143void ^?{}(processor & this);
144
145static inline void ?{}(processor & this) { this{ "Anonymous Processor", *mainCluster}; }
146static inline void ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
147static inline void ?{}(processor & this, const char name[]) { this{name, *mainCluster}; }
148
149//-----------------------------------------------------------------------------
150// Cluster Tools
151
152// Intrusives lanes which are used by the ready queue
153struct __attribute__((aligned(128))) __intrusive_lane_t;
154void ?{}(__intrusive_lane_t & this);
155void ^?{}(__intrusive_lane_t & this);
156
157// Aligned timestamps which are used by the ready queue and io subsystem
158struct __attribute__((aligned(128))) __timestamp_t {
159 volatile unsigned long long tv;
160 volatile unsigned long long ma;
161};
162
163static inline void ?{}(__timestamp_t & this) { this.tv = 0; this.ma = 0; }
164static inline void ^?{}(__timestamp_t &) {}
165
166
167struct __attribute__((aligned(16))) __cache_id_t {
168 volatile unsigned id;
169};
170
171// //TODO adjust cache size to ARCHITECTURE
172// // Structure holding the ready queue
173// struct __ready_queue_t {
174// // Data tracking the actual lanes
175// // On a seperate cacheline from the used struct since
176// // used can change on each push/pop but this data
177// // only changes on shrink/grow
178// struct {
179// // Arary of lanes
180// __intrusive_lane_t * volatile data;
181
182// __cache_id_t * volatile caches;
183
184// // Number of lanes (empty or not)
185// volatile size_t count;
186// } lanes;
187// };
188
189// void ?{}(__ready_queue_t & this);
190// void ^?{}(__ready_queue_t & this);
191
192// Idle Sleep
193struct __cluster_proc_list {
194 // Spin lock protecting the queue
195 __spinlock_t lock;
196
197 // FD to use to wake a processor
198 struct __fd_waitctx * volatile fdw;
199
200 // Total number of processors
201 unsigned total;
202
203 // Total number of idle processors
204 unsigned idle;
205
206 // List of idle processors
207 dlist(processor) idles;
208
209 // List of active processors
210 dlist(processor) actives;
211};
212
213//-----------------------------------------------------------------------------
214// Cluster
215struct __attribute__((aligned(128))) cluster {
216 struct {
217 struct {
218 // Arary of subqueues
219 __intrusive_lane_t * volatile data;
220
221 // Time since subqueues were processed
222 __timestamp_t * volatile tscs;
223
224 // Number of subqueue / timestamps
225 size_t count;
226 } readyQ;
227
228 struct {
229 // Number of I/O subqueues
230 volatile size_t count;
231
232 // Time since subqueues were processed
233 __timestamp_t * volatile tscs;
234 } io;
235
236 // Cache each kernel thread belongs to
237 __cache_id_t * volatile caches;
238 } sched;
239
240 // // Ready queue for threads
241 // __ready_queue_t ready_queue;
242
243 // Name of the cluster
244 const char * name;
245
246 // Preemption rate on this cluster
247 Duration preemption_rate;
248
249 // List of idle processors
250 __cluster_proc_list procs;
251
252 // List of threads
253 __spinlock_t thread_list_lock;
254 __dllist_t(struct thread$) threads;
255 unsigned int nthreads;
256
257 // Link lists fields
258 struct __dbg_node_cltr {
259 cluster * next;
260 cluster * prev;
261 } node;
262
263 struct {
264 $io_arbiter * arbiter;
265 io_context_params params;
266 } io;
267
268 #if !defined(__CFA_NO_STATISTICS__)
269 struct __stats_t * stats;
270 int print_stats;
271 #endif
272};
273extern Duration default_preemption();
274
275void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
276void ^?{}(cluster & this);
277
278static inline void ?{} (cluster & this) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
279static inline void ?{} (cluster & this, Duration preemption_rate) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
280static inline void ?{} (cluster & this, const char name[]) { io_context_params default_params; this{name, default_preemption(), 1, default_params}; }
281static inline void ?{} (cluster & this, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
282static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
283static inline void ?{} (cluster & this, const char name[], unsigned num_io) { io_context_params default_params; this{name, default_preemption(), num_io, default_params}; }
284static inline void ?{} (cluster & this, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
285static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
286static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params) { this{name, default_preemption(), 1, io_params}; }
287static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
288static 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}; }
289static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params) { this{name, default_preemption(), num_io, io_params}; }
290
291static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
292
293static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
294static inline struct cluster * active_cluster () { return publicTLS_get( this_processor )->cltr; }
295
296#if !defined(__CFA_NO_STATISTICS__)
297 void print_stats_now( cluster & this, int flags );
298
299 static inline void print_stats_at_exit( cluster & this, int flags ) {
300 this.print_stats |= flags;
301 }
302
303 static inline void print_stats_at_exit( processor & this, int flags ) {
304 this.print_stats |= flags;
305 }
306
307 void print_halts( processor & this );
308#endif
309
310// Local Variables: //
311// mode: c //
312// tab-width: 4 //
313// End: //
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