source: libcfa/src/concurrency/kernel.hfa@ 224916b

ADT ast-experimental enum forall-pointer-decay pthread-emulation qualifiedEnum
Last change on this file since 224916b was 0fb3ee5, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

@optim: maximize chances "cache" array stays in cache.
  • Property mode set to 100644
File size: 9.2 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// Wrapper around kernel threads
58struct __attribute__((aligned(128))) processor {
59 // Cluster from which to get threads
60 struct cluster * cltr;
61
62 // Ready Queue state per processor
63 struct {
64 unsigned short its;
65 unsigned short itr;
66 unsigned id;
67 unsigned target;
68 unsigned last;
69 signed cpu;
70 } rdq;
71
72 // Set to true to notify the processor should terminate
73 volatile bool do_terminate;
74
75 // Coroutine ctx who does keeps the state of the processor
76 struct processorCtx_t runner;
77
78 // Name of the processor
79 const char * name;
80
81 // Handle to pthreads
82 pthread_t kernel_thread;
83
84 // Unique id for the processor (not per cluster)
85 unsigned unique_id;
86
87 struct {
88 $io_context * ctx;
89 bool pending;
90 bool dirty;
91 } io;
92
93 // Preemption data
94 // Node which is added in the discrete event simulaiton
95 struct alarm_node_t * preemption_alarm;
96
97 // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
98 bool pending_preemption;
99
100 // Idle lock (kernel semaphore)
101 int idle_fd;
102
103 // Termination synchronisation (user semaphore)
104 oneshot terminated;
105
106 // pthread Stack
107 void * stack;
108
109 // Link lists fields
110 inline dlink(processor);
111
112 // special init fields
113 // This is needed for memcached integration
114 // once memcached experiments are done this should probably be removed
115 // it is not a particularly safe scheme as it can make processors less homogeneous
116 struct {
117 thread$ * thrd;
118 } init;
119
120 struct KernelThreadData * local_data;
121
122 #if !defined(__CFA_NO_STATISTICS__)
123 int print_stats;
124 bool print_halts;
125 #endif
126
127#ifdef __CFA_DEBUG__
128 // Last function to enable preemption on this processor
129 const char * last_enable;
130#endif
131};
132P9_EMBEDDED( processor, dlink(processor) )
133
134void ?{}(processor & this, const char name[], struct cluster & cltr);
135void ^?{}(processor & this);
136
137static inline void ?{}(processor & this) { this{ "Anonymous Processor", *mainCluster}; }
138static inline void ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
139static inline void ?{}(processor & this, const char name[]) { this{name, *mainCluster}; }
140
141//-----------------------------------------------------------------------------
142// Cluster Tools
143
144// Intrusives lanes which are used by the ready queue
145struct __attribute__((aligned(128))) __intrusive_lane_t;
146void ?{}(__intrusive_lane_t & this);
147void ^?{}(__intrusive_lane_t & this);
148
149// Aligned timestamps which are used by the relaxed ready queue
150struct __attribute__((aligned(128))) __timestamp_t {
151 volatile unsigned long long tv;
152 volatile unsigned long long ma;
153};
154
155struct __attribute__((aligned(16))) __cache_id_t {
156 volatile unsigned id;
157};
158
159// Aligned timestamps which are used by the relaxed ready queue
160struct __attribute__((aligned(128))) __help_cnts_t {
161 volatile unsigned long long src;
162 volatile unsigned long long dst;
163 volatile unsigned long long tri;
164};
165
166static inline void ?{}(__timestamp_t & this) { this.tv = 0; this.ma = 0; }
167static inline void ^?{}(__timestamp_t & this) {}
168
169struct __attribute__((aligned(128))) __ready_queue_caches_t;
170void ?{}(__ready_queue_caches_t & this);
171void ^?{}(__ready_queue_caches_t & this);
172
173//TODO adjust cache size to ARCHITECTURE
174// Structure holding the ready queue
175struct __ready_queue_t {
176 // Data tracking the actual lanes
177 // On a seperate cacheline from the used struct since
178 // used can change on each push/pop but this data
179 // only changes on shrink/grow
180 struct {
181 // Arary of lanes
182 __intrusive_lane_t * volatile data;
183
184 // Array of times
185 __timestamp_t * volatile tscs;
186
187 __cache_id_t * volatile caches;
188
189 // Array of stats
190 __help_cnts_t * volatile help;
191
192 // Number of lanes (empty or not)
193 volatile size_t count;
194 } lanes;
195};
196
197void ?{}(__ready_queue_t & this);
198void ^?{}(__ready_queue_t & this);
199#if !defined(__CFA_NO_STATISTICS__)
200 unsigned cnt(const __ready_queue_t & this, unsigned idx);
201#endif
202
203// Idle Sleep
204struct __cluster_proc_list {
205 // Spin lock protecting the queue
206 __spinlock_t lock;
207
208 // FD to use to wake a processor
209 volatile int fd;
210
211 // Total number of processors
212 unsigned total;
213
214 // Total number of idle processors
215 unsigned idle;
216
217 // List of idle processors
218 dlist(processor) idles;
219
220 // List of active processors
221 dlist(processor) actives;
222};
223
224//-----------------------------------------------------------------------------
225// Cluster
226struct __attribute__((aligned(128))) cluster {
227 // Ready queue for threads
228 __ready_queue_t ready_queue;
229
230 // Name of the cluster
231 const char * name;
232
233 // Preemption rate on this cluster
234 Duration preemption_rate;
235
236 // List of idle processors
237 __cluster_proc_list procs;
238
239 // List of threads
240 __spinlock_t thread_list_lock;
241 __dllist_t(struct thread$) threads;
242 unsigned int nthreads;
243
244 // Link lists fields
245 struct __dbg_node_cltr {
246 cluster * next;
247 cluster * prev;
248 } node;
249
250 struct {
251 $io_arbiter * arbiter;
252 io_context_params params;
253 } io;
254
255 #if !defined(__CFA_NO_STATISTICS__)
256 struct __stats_t * stats;
257 int print_stats;
258 #endif
259};
260extern Duration default_preemption();
261
262void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
263void ^?{}(cluster & this);
264
265static inline void ?{} (cluster & this) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
266static inline void ?{} (cluster & this, Duration preemption_rate) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
267static inline void ?{} (cluster & this, const char name[]) { io_context_params default_params; this{name, default_preemption(), 1, default_params}; }
268static inline void ?{} (cluster & this, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
269static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
270static inline void ?{} (cluster & this, const char name[], unsigned num_io) { io_context_params default_params; this{name, default_preemption(), num_io, default_params}; }
271static inline void ?{} (cluster & this, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
272static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
273static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params) { this{name, default_preemption(), 1, io_params}; }
274static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
275static 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}; }
276static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params) { this{name, default_preemption(), num_io, io_params}; }
277
278static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
279
280static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
281static inline struct cluster * active_cluster () { return publicTLS_get( this_processor )->cltr; }
282
283#if !defined(__CFA_NO_STATISTICS__)
284 void print_stats_now( cluster & this, int flags );
285
286 static inline void print_stats_at_exit( cluster & this, int flags ) {
287 this.print_stats |= flags;
288 }
289
290 static inline void print_stats_at_exit( processor & this, int flags ) {
291 this.print_stats |= flags;
292 }
293
294 void print_halts( processor & this );
295#endif
296
297// Local Variables: //
298// mode: c //
299// tab-width: 4 //
300// End: //
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