source: libcfa/src/concurrency/kernel.hfa@ b5f17e14

ADT ast-experimental enum forall-pointer-decay pthread-emulation qualifiedEnum
Last change on this file since b5f17e14 was a2a4566, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

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