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libcfa/src/concurrency/io/setup.cfa (modified) (12 diffs)
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libcfa/src/concurrency/io/setup.cfa
rf815c46 r2fab24e3 26 26 27 27 #if !defined(CFA_HAVE_LINUX_IO_URING_H) 28 void __kernel_io_startup() { 29 // Nothing to do without io_uring 30 } 31 32 void __kernel_io_shutdown() { 33 // Nothing to do without io_uring 34 } 35 28 36 void ?{}(io_context_params & this) {} 29 37 30 void ?{}($io_context & this, struct cluster & cl) {} 31 void ^?{}($io_context & this) {} 32 33 void __cfa_io_start( processor * proc ) {} 34 void __cfa_io_flush( processor * proc ) {} 35 void __cfa_io_stop ( processor * proc ) {} 36 37 $io_arbiter * create(void) { return 0p; } 38 void destroy($io_arbiter *) {} 38 void ?{}(io_context & this, struct cluster & cl) {} 39 void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) {} 40 41 void ^?{}(io_context & this) {} 42 void ^?{}(io_context & this, bool cluster_context) {} 43 44 void register_fixed_files( io_context &, int *, unsigned ) {} 45 void register_fixed_files( cluster &, int *, unsigned ) {} 39 46 40 47 #else … … 61 68 void ?{}(io_context_params & this) { 62 69 this.num_entries = 256; 70 this.num_ready = 256; 71 this.submit_aff = -1; 72 this.eager_submits = false; 73 this.poller_submits = false; 74 this.poll_submit = false; 75 this.poll_complete = false; 63 76 } 64 77 … … 93 106 94 107 //============================================================================================= 108 // I/O Startup / Shutdown logic + Master Poller 109 //============================================================================================= 110 111 // IO Master poller loop forward 112 static void * iopoll_loop( __attribute__((unused)) void * args ); 113 114 static struct { 115 pthread_t thrd; // pthread handle to io poller thread 116 void * stack; // pthread stack for io poller thread 117 int epollfd; // file descriptor to the epoll instance 118 volatile bool run; // Whether or not to continue 119 volatile bool stopped; // Whether the poller has finished running 120 volatile uint64_t epoch; // Epoch used for memory reclamation 121 } iopoll; 122 123 void __kernel_io_startup(void) { 124 __cfadbg_print_safe(io_core, "Kernel : Creating EPOLL instance\n" ); 125 126 iopoll.epollfd = epoll_create1(0); 127 if (iopoll.epollfd == -1) { 128 abort( "internal error, epoll_create1\n"); 129 } 130 131 __cfadbg_print_safe(io_core, "Kernel : Starting io poller thread\n" ); 132 133 iopoll.stack = __create_pthread( &iopoll.thrd, iopoll_loop, 0p ); 134 iopoll.run = true; 135 iopoll.stopped = false; 136 iopoll.epoch = 0; 137 } 138 139 void __kernel_io_shutdown(void) { 140 // Notify the io poller thread of the shutdown 141 iopoll.run = false; 142 sigval val = { 1 }; 143 pthread_sigqueue( iopoll.thrd, SIGUSR1, val ); 144 145 // Wait for the io poller thread to finish 146 147 __destroy_pthread( iopoll.thrd, iopoll.stack, 0p ); 148 149 int ret = close(iopoll.epollfd); 150 if (ret == -1) { 151 abort( "internal error, close epoll\n"); 152 } 153 154 // Io polling is now fully stopped 155 156 __cfadbg_print_safe(io_core, "Kernel : IO poller stopped\n" ); 157 } 158 159 static void * iopoll_loop( __attribute__((unused)) void * args ) { 160 __processor_id_t id; 161 id.full_proc = false; 162 id.id = doregister(&id); 163 __cfaabi_tls.this_proc_id = &id; 164 __cfadbg_print_safe(io_core, "Kernel : IO poller thread starting\n" ); 165 166 // Block signals to control when they arrive 167 sigset_t mask; 168 sigfillset(&mask); 169 if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) { 170 abort( "internal error, pthread_sigmask" ); 171 } 172 173 sigdelset( &mask, SIGUSR1 ); 174 175 // Create sufficient events 176 struct epoll_event events[10]; 177 // Main loop 178 while( iopoll.run ) { 179 __cfadbg_print_safe(io_core, "Kernel I/O - epoll : waiting on io_uring contexts\n"); 180 181 // increment the epoch to notify any deleters we are starting a new cycle 182 __atomic_fetch_add(&iopoll.epoch, 1, __ATOMIC_SEQ_CST); 183 184 // Wait for events 185 int nfds = epoll_pwait( iopoll.epollfd, events, 10, -1, &mask ); 186 187 __cfadbg_print_safe(io_core, "Kernel I/O - epoll : %d io contexts events, waking up\n", nfds); 188 189 // Check if an error occured 190 if (nfds == -1) { 191 if( errno == EINTR ) continue; 192 abort( "internal error, pthread_sigmask" ); 193 } 194 195 for(i; nfds) { 196 $io_ctx_thread * io_ctx = ($io_ctx_thread *)(uintptr_t)events[i].data.u64; 197 /* paranoid */ verify( io_ctx ); 198 __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Unparking io poller %d (%p)\n", io_ctx->ring->fd, io_ctx); 199 #if !defined( __CFA_NO_STATISTICS__ ) 200 __cfaabi_tls.this_stats = io_ctx->self.curr_cluster->stats; 201 #endif 202 203 eventfd_t v; 204 eventfd_read(io_ctx->ring->efd, &v); 205 206 post( io_ctx->sem ); 207 } 208 } 209 210 __atomic_store_n(&iopoll.stopped, true, __ATOMIC_SEQ_CST); 211 212 __cfadbg_print_safe(io_core, "Kernel : IO poller thread stopping\n" ); 213 unregister(&id); 214 return 0p; 215 } 216 217 //============================================================================================= 95 218 // I/O Context Constrution/Destruction 96 219 //============================================================================================= 97 220 98 99 100 static void __io_uring_setup ( $io_context & this, const io_context_params & params_in, int procfd ); 101 static void __io_uring_teardown( $io_context & this ); 102 static void __epoll_register($io_context & ctx); 103 static void __epoll_unregister($io_context & ctx); 104 void __ioarbiter_register( $io_arbiter & mutex, $io_context & ctx ); 105 void __ioarbiter_unregister( $io_arbiter & mutex, $io_context & ctx ); 106 107 void ?{}($io_context & this, processor * proc, struct cluster & cl) { 108 /* paranoid */ verify( cl.io.arbiter ); 109 this.proc = proc; 110 this.arbiter = cl.io.arbiter; 111 this.ext_sq.empty = true; 112 (this.ext_sq.blocked){}; 113 __io_uring_setup( this, cl.io.params, proc->idle ); 114 __cfadbg_print_safe(io_core, "Kernel I/O : Created ring for io_context %u (%p)\n", this.fd, &this); 115 } 116 117 void ^?{}($io_context & this) { 118 __cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %u\n", this.fd); 119 120 __io_uring_teardown( this ); 121 __cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %u\n", this.fd); 221 void ?{}($io_ctx_thread & this, struct cluster & cl) { (this.self){ "IO Poller", cl }; } 222 void main( $io_ctx_thread & this ); 223 static inline $thread * get_thread( $io_ctx_thread & this ) { return &this.self; } 224 void ^?{}( $io_ctx_thread & mutex this ) {} 225 226 static void __io_create ( __io_data & this, const io_context_params & params_in ); 227 static void __io_destroy( __io_data & this ); 228 229 void ?{}(io_context & this, struct cluster & cl, const io_context_params & params) { 230 (this.thrd){ cl }; 231 this.thrd.ring = malloc(); 232 __cfadbg_print_safe(io_core, "Kernel I/O : Creating ring for io_context %p\n", &this); 233 __io_create( *this.thrd.ring, params ); 234 235 __cfadbg_print_safe(io_core, "Kernel I/O : Starting poller thread for io_context %p\n", &this); 236 this.thrd.done = false; 237 __thrd_start( this.thrd, main ); 238 239 __cfadbg_print_safe(io_core, "Kernel I/O : io_context %p ready\n", &this); 240 } 241 242 void ?{}(io_context & this, struct cluster & cl) { 243 io_context_params params; 244 (this){ cl, params }; 245 } 246 247 void ^?{}(io_context & this, bool cluster_context) { 248 __cfadbg_print_safe(io_core, "Kernel I/O : tearing down io_context %p\n", &this); 249 250 // Notify the thread of the shutdown 251 __atomic_store_n(&this.thrd.done, true, __ATOMIC_SEQ_CST); 252 253 // If this is an io_context within a cluster, things get trickier 254 $thread & thrd = this.thrd.self; 255 if( cluster_context ) { 256 // We are about to do weird things with the threads 257 // we don't need interrupts to complicate everything 258 disable_interrupts(); 259 260 // Get cluster info 261 cluster & cltr = *thrd.curr_cluster; 262 /* paranoid */ verify( cltr.idles.total == 0 || &cltr == mainCluster ); 263 /* paranoid */ verify( !ready_mutate_islocked() ); 264 265 // We need to adjust the clean-up based on where the thread is 266 if( thrd.state == Ready || thrd.preempted != __NO_PREEMPTION ) { 267 // This is the tricky case 268 // The thread was preempted or ready to run and now it is on the ready queue 269 // but the cluster is shutting down, so there aren't any processors to run the ready queue 270 // the solution is to steal the thread from the ready-queue and pretend it was blocked all along 271 272 ready_schedule_lock(); 273 // The thread should on the list 274 /* paranoid */ verify( thrd.link.next != 0p ); 275 276 // Remove the thread from the ready queue of this cluster 277 // The thread should be the last on the list 278 __attribute__((unused)) bool removed = remove_head( &cltr, &thrd ); 279 /* paranoid */ verify( removed ); 280 thrd.link.next = 0p; 281 thrd.link.prev = 0p; 282 283 // Fixup the thread state 284 thrd.state = Blocked; 285 thrd.ticket = TICKET_BLOCKED; 286 thrd.preempted = __NO_PREEMPTION; 287 288 ready_schedule_unlock(); 289 290 // Pretend like the thread was blocked all along 291 } 292 // !!! This is not an else if !!! 293 // Ok, now the thread is blocked (whether we cheated to get here or not) 294 if( thrd.state == Blocked ) { 295 // This is the "easy case" 296 // The thread is parked and can easily be moved to active cluster 297 verify( thrd.curr_cluster != active_cluster() || thrd.curr_cluster == mainCluster ); 298 thrd.curr_cluster = active_cluster(); 299 300 // unpark the fast io_poller 301 unpark( &thrd ); 302 } 303 else { 304 // The thread is in a weird state 305 // I don't know what to do here 306 abort("io_context poller thread is in unexpected state, cannot clean-up correctly\n"); 307 } 308 309 // The weird thread kidnapping stuff is over, restore interrupts. 310 enable_interrupts( __cfaabi_dbg_ctx ); 311 } else { 312 post( this.thrd.sem ); 313 } 314 315 ^(this.thrd){}; 316 __cfadbg_print_safe(io_core, "Kernel I/O : Stopped poller thread for io_context %p\n", &this); 317 318 __io_destroy( *this.thrd.ring ); 319 __cfadbg_print_safe(io_core, "Kernel I/O : Destroyed ring for io_context %p\n", &this); 320 321 free(this.thrd.ring); 322 } 323 324 void ^?{}(io_context & this) { 325 ^(this){ false }; 122 326 } 123 327 … … 125 329 extern void __enable_interrupts_hard(); 126 330 127 static void __io_ uring_setup( $io_context & this, const io_context_params & params_in, int procfd) {331 static void __io_create( __io_data & this, const io_context_params & params_in ) { 128 332 // Step 1 : call to setup 129 333 struct io_uring_params params; 130 334 memset(¶ms, 0, sizeof(params)); 131 //if( params_in.poll_submit ) params.flags |= IORING_SETUP_SQPOLL;132 //if( params_in.poll_complete ) params.flags |= IORING_SETUP_IOPOLL;335 if( params_in.poll_submit ) params.flags |= IORING_SETUP_SQPOLL; 336 if( params_in.poll_complete ) params.flags |= IORING_SETUP_IOPOLL; 133 337 134 338 __u32 nentries = params_in.num_entries != 0 ? params_in.num_entries : 256; … … 136 340 abort("ERROR: I/O setup 'num_entries' must be a power of 2\n"); 137 341 } 342 if( params_in.poller_submits && params_in.eager_submits ) { 343 abort("ERROR: I/O setup 'poller_submits' and 'eager_submits' cannot be used together\n"); 344 } 138 345 139 346 int fd = syscall(__NR_io_uring_setup, nentries, ¶ms ); … … 143 350 144 351 // Step 2 : mmap result 145 struct __sub_ring_t & sq = this.sq; 146 struct __cmp_ring_t & cq = this.cq; 352 memset( &this, 0, sizeof(struct __io_data) ); 353 struct __submition_data & sq = this.submit_q; 354 struct __completion_data & cq = this.completion_q; 147 355 148 356 // calculate the right ring size … … 193 401 // Get the pointers from the kernel to fill the structure 194 402 // submit queue 195 sq.kring.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head); 196 sq.kring.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail); 197 sq.kring.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array); 198 sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask); 199 sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries); 200 sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags); 201 sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped); 202 203 sq.kring.released = 0; 204 205 sq.free_ring.head = 0; 206 sq.free_ring.tail = *sq.num; 207 sq.free_ring.array = alloc( *sq.num, 128`align ); 208 for(i; (__u32)*sq.num) { 209 sq.free_ring.array[i] = i; 210 } 211 212 sq.to_submit = 0; 403 sq.head = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.head); 404 sq.tail = (volatile __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail); 405 sq.mask = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask); 406 sq.num = ( const __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries); 407 sq.flags = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags); 408 sq.dropped = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped); 409 sq.array = ( __u32 *)(((intptr_t)sq.ring_ptr) + params.sq_off.array); 410 sq.prev_head = *sq.head; 411 412 { 413 const __u32 num = *sq.num; 414 for( i; num ) { 415 __sqe_clean( &sq.sqes[i] ); 416 } 417 } 418 419 (sq.submit_lock){}; 420 (sq.release_lock){}; 421 422 if( params_in.poller_submits || params_in.eager_submits ) { 423 /* paranoid */ verify( is_pow2( params_in.num_ready ) || (params_in.num_ready < 8) ); 424 sq.ready_cnt = max( params_in.num_ready, 8 ); 425 sq.ready = alloc( sq.ready_cnt, 64`align ); 426 for(i; sq.ready_cnt) { 427 sq.ready[i] = -1ul32; 428 } 429 sq.prev_ready = 0; 430 } 431 else { 432 sq.ready_cnt = 0; 433 sq.ready = 0p; 434 sq.prev_ready = 0; 435 } 213 436 214 437 // completion queue … … 223 446 // io_uring_register is so f*cking slow on some machine that it 224 447 // will never succeed if preemption isn't hard blocked 225 __cfadbg_print_safe(io_core, "Kernel I/O : registering %d for completion with ring %d\n", procfd, fd);226 227 448 __disable_interrupts_hard(); 228 449 229 int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &procfd, 1); 450 int efd = eventfd(0, 0); 451 if (efd < 0) { 452 abort("KERNEL ERROR: IO_URING EVENTFD - %s\n", strerror(errno)); 453 } 454 455 int ret = syscall( __NR_io_uring_register, fd, IORING_REGISTER_EVENTFD, &efd, 1); 230 456 if (ret < 0) { 231 457 abort("KERNEL ERROR: IO_URING EVENTFD REGISTER - %s\n", strerror(errno)); … … 233 459 234 460 __enable_interrupts_hard(); 235 236 __cfadbg_print_safe(io_core, "Kernel I/O : registered %d for completion with ring %d\n", procfd, fd);237 461 238 462 // some paranoid checks … … 244 468 /* paranoid */ verifyf( (*sq.mask) == ((*sq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (*sq.num) - 1ul32, *sq.num, *sq.mask ); 245 469 /* paranoid */ verifyf( (*sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num ); 246 /* paranoid */ verifyf( (*sq. kring.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.kring.head );247 /* paranoid */ verifyf( (*sq. kring.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.kring.tail );470 /* paranoid */ verifyf( (*sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head ); 471 /* paranoid */ verifyf( (*sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail ); 248 472 249 473 // Update the global ring info 250 this.ring_flags = 0;474 this.ring_flags = params.flags; 251 475 this.fd = fd; 252 } 253 254 static void __io_uring_teardown( $io_context & this ) { 476 this.efd = efd; 477 this.eager_submits = params_in.eager_submits; 478 this.poller_submits = params_in.poller_submits; 479 } 480 481 static void __io_destroy( __io_data & this ) { 255 482 // Shutdown the io rings 256 struct __sub _ring_t & sq = this.sq;257 struct __c mp_ring_t & cq = this.cq;483 struct __submition_data & sq = this.submit_q; 484 struct __completion_data & cq = this.completion_q; 258 485 259 486 // unmap the submit queue entries … … 270 497 // close the file descriptor 271 498 close(this.fd); 272 273 free( this.sq.free_ring.array ); // Maybe null, doesn't matter 274 } 275 276 void __cfa_io_start( processor * proc ) { 277 proc->io.ctx = alloc(); 278 (*proc->io.ctx){proc, *proc->cltr}; 279 } 280 void __cfa_io_stop ( processor * proc ) { 281 ^(*proc->io.ctx){}; 282 free(proc->io.ctx); 499 close(this.efd); 500 501 free( this.submit_q.ready ); // Maybe null, doesn't matter 283 502 } 284 503 … … 286 505 // I/O Context Sleep 287 506 //============================================================================================= 288 // static inline void __epoll_ctl($io_context & ctx, int op, const char * error) { 289 // struct epoll_event ev; 290 // ev.events = EPOLLIN | EPOLLONESHOT; 291 // ev.data.u64 = (__u64)&ctx; 292 // int ret = epoll_ctl(iopoll.epollfd, op, ctx.efd, &ev); 293 // if (ret < 0) { 294 // abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) ); 295 // } 296 // } 297 298 // static void __epoll_register($io_context & ctx) { 299 // __epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD"); 300 // } 301 302 // static void __epoll_unregister($io_context & ctx) { 303 // // Read the current epoch so we know when to stop 304 // size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST); 305 306 // // Remove the fd from the iopoller 307 // __epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE"); 308 309 // // Notify the io poller thread of the shutdown 310 // iopoll.run = false; 311 // sigval val = { 1 }; 312 // pthread_sigqueue( iopoll.thrd, SIGUSR1, val ); 313 314 // // Make sure all this is done 315 // __atomic_thread_fence(__ATOMIC_SEQ_CST); 316 317 // // Wait for the next epoch 318 // while(curr == iopoll.epoch && !iopoll.stopped) Pause(); 319 // } 320 321 // void __ioctx_prepare_block($io_context & ctx) { 322 // __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.fd, &ctx); 323 // __epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM"); 324 // } 325 507 static inline void __ioctx_epoll_ctl($io_ctx_thread & ctx, int op, const char * error) { 508 struct epoll_event ev; 509 ev.events = EPOLLIN | EPOLLONESHOT; 510 ev.data.u64 = (__u64)&ctx; 511 int ret = epoll_ctl(iopoll.epollfd, op, ctx.ring->efd, &ev); 512 if (ret < 0) { 513 abort( "KERNEL ERROR: EPOLL %s - (%d) %s\n", error, (int)errno, strerror(errno) ); 514 } 515 } 516 517 void __ioctx_register($io_ctx_thread & ctx) { 518 __ioctx_epoll_ctl(ctx, EPOLL_CTL_ADD, "ADD"); 519 } 520 521 void __ioctx_prepare_block($io_ctx_thread & ctx) { 522 __cfadbg_print_safe(io_core, "Kernel I/O - epoll : Re-arming io poller %d (%p)\n", ctx.ring->fd, &ctx); 523 __ioctx_epoll_ctl(ctx, EPOLL_CTL_MOD, "REARM"); 524 } 525 526 void __ioctx_unregister($io_ctx_thread & ctx) { 527 // Read the current epoch so we know when to stop 528 size_t curr = __atomic_load_n(&iopoll.epoch, __ATOMIC_SEQ_CST); 529 530 // Remove the fd from the iopoller 531 __ioctx_epoll_ctl(ctx, EPOLL_CTL_DEL, "REMOVE"); 532 533 // Notify the io poller thread of the shutdown 534 iopoll.run = false; 535 sigval val = { 1 }; 536 pthread_sigqueue( iopoll.thrd, SIGUSR1, val ); 537 538 // Make sure all this is done 539 __atomic_thread_fence(__ATOMIC_SEQ_CST); 540 541 // Wait for the next epoch 542 while(curr == iopoll.epoch && !iopoll.stopped) Pause(); 543 } 326 544 327 545 //============================================================================================= 328 546 // I/O Context Misc Setup 329 547 //============================================================================================= 330 void ?{}( $io_arbiter & this ) { 331 this.pending.flag = false; 332 } 333 334 void ^?{}( $io_arbiter & mutex this ) { 335 // /* paranoid */ verify( empty(this.assigned) ); 336 // /* paranoid */ verify( empty(this.available) ); 337 /* paranoid */ verify( is_empty(this.pending.blocked) ); 338 } 339 340 $io_arbiter * create(void) { 341 return new(); 342 } 343 void destroy($io_arbiter * arbiter) { 344 delete(arbiter); 345 } 346 347 //============================================================================================= 348 // I/O Context Misc Setup 349 //============================================================================================= 350 548 void register_fixed_files( io_context & ctx, int * files, unsigned count ) { 549 int ret = syscall( __NR_io_uring_register, ctx.thrd.ring->fd, IORING_REGISTER_FILES, files, count ); 550 if( ret < 0 ) { 551 abort( "KERNEL ERROR: IO_URING REGISTER - (%d) %s\n", (int)errno, strerror(errno) ); 552 } 553 554 __cfadbg_print_safe( io_core, "Kernel I/O : Performed io_register for %p, returned %d\n", active_thread(), ret ); 555 } 556 557 void register_fixed_files( cluster & cltr, int * files, unsigned count ) { 558 for(i; cltr.io.cnt) { 559 register_fixed_files( cltr.io.ctxs[i], files, count ); 560 } 561 } 351 562 #endif
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