source: libcfa/src/concurrency/kernel.hfa @ bd0bdd37

arm-ehjacob/cs343-translationnew-ast-unique-expr
Last change on this file since bd0bdd37 was bd0bdd37, checked in by Thierry Delisle <tdelisle@…>, 8 months ago

Fix how bias is handled in the ready queue to be more consistent with multiple clusters.
Does not handle churn of processors yet.

  • Property mode set to 100644
File size: 8.4 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
51struct __processor_id_t {
52        unsigned id:24;
53        bool full_proc:1;
54
55        #if !defined(__CFA_NO_STATISTICS__)
56                struct __stats_t * stats;
57        #endif
58};
59
60coroutine processorCtx_t {
61        struct processor * proc;
62};
63
64// Wrapper around kernel threads
65struct __attribute__((aligned(128))) processor {
66        // Main state
67        inline __processor_id_t;
68
69        // Cluster from which to get threads
70        struct cluster * cltr;
71
72        // Id within the cluster
73        unsigned cltr_id;
74
75        // Set to true to notify the processor should terminate
76        volatile bool do_terminate;
77
78        // Coroutine ctx who does keeps the state of the processor
79        struct processorCtx_t runner;
80
81        // Name of the processor
82        const char * name;
83
84        // Handle to pthreads
85        pthread_t kernel_thread;
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;
102
103        // Termination synchronisation (user semaphore)
104        oneshot terminated;
105
106        // pthread Stack
107        void * stack;
108
109        // Link lists fields
110        DLISTED_MGD_IMPL_IN(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        #if !defined(__CFA_NO_STATISTICS__)
121                int print_stats;
122                bool print_halts;
123        #endif
124
125#ifdef __CFA_DEBUG__
126        // Last function to enable preemption on this processor
127        const char * last_enable;
128#endif
129};
130
131void  ?{}(processor & this, const char name[], struct cluster & cltr);
132void ^?{}(processor & this);
133
134static inline void  ?{}(processor & this)                        { this{ "Anonymous Processor", *mainCluster}; }
135static inline void  ?{}(processor & this, struct cluster & cltr) { this{ "Anonymous Processor", cltr}; }
136static inline void  ?{}(processor & this, const char name[])     { this{name, *mainCluster}; }
137
138DLISTED_MGD_IMPL_OUT(processor)
139
140//-----------------------------------------------------------------------------
141// Cluster Tools
142
143// Intrusives lanes which are used by the relaxed ready queue
144struct __attribute__((aligned(128))) __intrusive_lane_t;
145void  ?{}(__intrusive_lane_t & this);
146void ^?{}(__intrusive_lane_t & this);
147
148// Counter used for wether or not the lanes are all empty
149struct __attribute__((aligned(128))) __snzi_node_t;
150struct __snzi_t {
151        unsigned mask;
152        int root;
153        __snzi_node_t * nodes;
154};
155
156void  ?{}( __snzi_t & this, unsigned depth );
157void ^?{}( __snzi_t & this );
158
159//TODO adjust cache size to ARCHITECTURE
160// Structure holding the relaxed ready queue
161struct __ready_queue_t {
162        // Data tracking how many/which lanes are used
163        // Aligned to 128 for cache locality
164        __snzi_t snzi;
165
166        // Data tracking the actual lanes
167        // On a seperate cacheline from the used struct since
168        // used can change on each push/pop but this data
169        // only changes on shrink/grow
170        struct {
171                // Arary of lanes
172                __intrusive_lane_t * volatile data;
173
174                // Number of lanes (empty or not)
175                volatile size_t count;
176        } lanes;
177};
178
179void  ?{}(__ready_queue_t & this);
180void ^?{}(__ready_queue_t & this);
181
182// Idle Sleep
183struct __cluster_idles {
184        // Spin lock protecting the queue
185        volatile uint64_t lock;
186
187        // Total number of processors
188        unsigned total;
189
190        // Total number of idle processors
191        unsigned idle;
192
193        // List of idle processors
194        dlist(processor, processor) list;
195};
196
197//-----------------------------------------------------------------------------
198// Cluster
199struct __attribute__((aligned(128))) cluster {
200        // Ready queue for threads
201        __ready_queue_t ready_queue;
202
203        // Name of the cluster
204        const char * name;
205
206        // Preemption rate on this cluster
207        Duration preemption_rate;
208
209        // List of idle processors
210        __cluster_idles idles;
211
212        // List of threads
213        __spinlock_t thread_list_lock;
214        __dllist_t(struct $thread) threads;
215        unsigned int nthreads;
216
217        // Link lists fields
218        struct __dbg_node_cltr {
219                cluster * next;
220                cluster * prev;
221        } node;
222
223        struct {
224                $io_arbiter * arbiter;
225                io_context_params params;
226        } io;
227
228        #if !defined(__CFA_NO_STATISTICS__)
229                struct __stats_t * stats;
230                int print_stats;
231        #endif
232};
233extern Duration default_preemption();
234
235void ?{} (cluster & this, const char name[], Duration preemption_rate, unsigned num_io, const io_context_params & io_params);
236void ^?{}(cluster & this);
237
238static inline void ?{} (cluster & this)                                            { io_context_params default_params;    this{"Anonymous Cluster", default_preemption(), 1, default_params}; }
239static inline void ?{} (cluster & this, Duration preemption_rate)                  { io_context_params default_params;    this{"Anonymous Cluster", preemption_rate, 1, default_params}; }
240static inline void ?{} (cluster & this, const char name[])                         { io_context_params default_params;    this{name, default_preemption(), 1, default_params}; }
241static inline void ?{} (cluster & this, unsigned num_io)                           { io_context_params default_params;    this{"Anonymous Cluster", default_preemption(), num_io, default_params}; }
242static inline void ?{} (cluster & this, Duration preemption_rate, unsigned num_io) { io_context_params default_params;    this{"Anonymous Cluster", preemption_rate, num_io, default_params}; }
243static inline void ?{} (cluster & this, const char name[], unsigned num_io)        { io_context_params default_params;    this{name, default_preemption(), num_io, default_params}; }
244static inline void ?{} (cluster & this, const io_context_params & io_params)                                            { this{"Anonymous Cluster", default_preemption(), 1, io_params}; }
245static inline void ?{} (cluster & this, Duration preemption_rate, const io_context_params & io_params)                  { this{"Anonymous Cluster", preemption_rate, 1, io_params}; }
246static inline void ?{} (cluster & this, const char name[], const io_context_params & io_params)                         { this{name, default_preemption(), 1, io_params}; }
247static inline void ?{} (cluster & this, unsigned num_io, const io_context_params & io_params)                           { this{"Anonymous Cluster", default_preemption(), num_io, io_params}; }
248static 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}; }
249static inline void ?{} (cluster & this, const char name[], unsigned num_io, const io_context_params & io_params)        { this{name, default_preemption(), num_io, io_params}; }
250
251static inline [cluster *&, cluster *& ] __get( cluster & this ) __attribute__((const)) { return this.node.[next, prev]; }
252
253static inline struct processor * active_processor() { return publicTLS_get( this_processor ); } // UNSAFE
254static inline struct cluster   * active_cluster  () { return publicTLS_get( this_processor )->cltr; }
255
256#if !defined(__CFA_NO_STATISTICS__)
257        void print_stats_now( cluster & this, int flags );
258
259        static inline void print_stats_at_exit( cluster & this, int flags ) {
260                this.print_stats |= flags;
261        }
262
263        static inline void print_stats_at_exit( processor & this, int flags ) {
264                this.print_stats |= flags;
265        }
266
267        void print_halts( processor & this );
268#endif
269
270// Local Variables: //
271// mode: c //
272// tab-width: 4 //
273// End: //
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