source: libcfa/src/concurrency/kernel.hfa@ eaf269d

ADT ast-experimental enum forall-pointer-decay pthread-emulation qualifiedEnum
Last change on this file since eaf269d was 1757f98, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Refactoring idle sleep to try and help the change from idle on read to idle on io_uring_enter.
  • Property mode set to 100644
File size: 9.0 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
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 unsigned cnt;
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
156// Aligned timestamps which are used by the relaxed ready queue
157struct __attribute__((aligned(128))) __help_cnts_t {
158 volatile unsigned long long src;
159 volatile unsigned long long dst;
160 volatile unsigned long long tri;
161};
162
163static inline void ?{}(__timestamp_t & this) { this.tv = 0; this.ma = 0; }
164static inline void ^?{}(__timestamp_t & this) {}
165
166//TODO adjust cache size to ARCHITECTURE
167// Structure holding the relaxed ready queue
168struct __ready_queue_t {
169 // Data tracking the actual lanes
170 // On a seperate cacheline from the used struct since
171 // used can change on each push/pop but this data
172 // only changes on shrink/grow
173 struct {
174 // Arary of lanes
175 __intrusive_lane_t * volatile data;
176
177 // Array of times
178 __timestamp_t * volatile tscs;
179
180 // Array of stats
181 __help_cnts_t * volatile help;
182
183 // Number of lanes (empty or not)
184 volatile size_t count;
185 } lanes;
186};
187
188void ?{}(__ready_queue_t & this);
189void ^?{}(__ready_queue_t & this);
190#if !defined(__CFA_NO_STATISTICS__)
191 unsigned cnt(const __ready_queue_t & this, unsigned idx);
192#endif
193
194// Idle Sleep
195struct __cluster_proc_list {
196 // Spin lock protecting the queue
197 __spinlock_t lock;
198
199 // FD to use to wake a processor
200 volatile int fd;
201
202 // Total number of processors
203 unsigned total;
204
205 // Total number of idle processors
206 unsigned idle;
207
208 // List of idle processors
209 dlist(processor) idles;
210
211 // List of active processors
212 dlist(processor) actives;
213};
214
215//-----------------------------------------------------------------------------
216// Cluster
217struct __attribute__((aligned(128))) cluster {
218 // Ready queue for threads
219 __ready_queue_t ready_queue;
220
221 // Name of the cluster
222 const char * name;
223
224 // Preemption rate on this cluster
225 Duration preemption_rate;
226
227 // List of idle processors
228 __cluster_proc_list procs;
229
230 // List of threads
231 __spinlock_t thread_list_lock;
232 __dllist_t(struct thread$) threads;
233 unsigned int nthreads;
234
235 // Link lists fields
236 struct __dbg_node_cltr {
237 cluster * next;
238 cluster * prev;
239 } node;
240
241 struct {
242 $io_arbiter * arbiter;
243 io_context_params params;
244 } io;
245
246 #if !defined(__CFA_NO_STATISTICS__)
247 struct __stats_t * stats;
248 int print_stats;
249 #endif
250};
251extern Duration default_preemption();
252
253void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
254void ^?{}(cluster & this);
255
256static inline void ?{} (cluster & this) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
257static inline void ?{} (cluster & this, Duration preemption_rate) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
258static inline void ?{} (cluster & this, const char name[]) { io_context_params default_params; this{name, default_preemption(), 1, default_params}; }
259static inline void ?{} (cluster & this, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
260static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params; this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
261static inline void ?{} (cluster & this, const char name[], unsigned num_io) { io_context_params default_params; this{name, default_preemption(), num_io, default_params}; }
262static inline void ?{} (cluster & this, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
263static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params) { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
264static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params) { this{name, default_preemption(), 1, io_params}; }
265static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params) { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
266static 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}; }
267static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params) { this{name, default_preemption(), num_io, io_params}; }
268
269static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
270
271static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
272static inline struct cluster * active_cluster () { return publicTLS_get( this_processor )->cltr; }
273
274#if !defined(__CFA_NO_STATISTICS__)
275 void print_stats_now( cluster & this, int flags );
276
277 static inline void print_stats_at_exit( cluster & this, int flags ) {
278 this.print_stats |= flags;
279 }
280
281 static inline void print_stats_at_exit( processor & this, int flags ) {
282 this.print_stats |= flags;
283 }
284
285 void print_halts( processor & this );
286#endif
287
288// Local Variables: //
289// mode: c //
290// tab-width: 4 //
291// End: //
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