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File _service:tar_scm:6858051-Create-GC-worker-threads-dynamically.patch of Package openjdk-1.8.0
From 28b440ef9821dd8cccbdead7039e0d8eb1cc939f Mon Sep 17 00:00:00 2001 Date: Fri, 22 Jan 2021 16:17:32 +0800 Subject: 6858051: Create GC worker threads dynamically Summary: <gc>: Create GC worker threads dynamically LLT: hotspot/test/gc/ergonomics/TestDynamicNumberOfGCThreads.java Bug url: https://bugs.openjdk.java.net/browse/JDK-6858051 --- .../parallelScavenge/gcTaskManager.cpp | 70 ++++++++++++----- .../parallelScavenge/gcTaskManager.hpp | 12 ++- .../parallelScavenge/gcTaskThread.cpp | 7 -- .../parallelScavenge/gcTaskThread.hpp | 6 +- .../shared/adaptiveSizePolicy.cpp | 9 +-- .../shared/adaptiveSizePolicy.hpp | 2 +- .../shared/workerManager.hpp | 77 +++++++++++++++++++ 7 files changed, 144 insertions(+), 39 deletions(-) create mode 100644 hotspot/src/share/vm/gc_implementation/shared/workerManager.hpp diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp index 153e5bd86..3efeab85d 100644 --- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp +++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.cpp @@ -25,12 +25,13 @@ #include "precompiled.hpp" #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" #include "gc_implementation/parallelScavenge/gcTaskThread.hpp" -#include "gc_implementation/shared/adaptiveSizePolicy.hpp" +#include "gc_implementation/shared/workerManager.hpp" #include "memory/allocation.hpp" #include "memory/allocation.inline.hpp" #include "runtime/mutex.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/orderAccess.inline.hpp" +#include "runtime/os.hpp" PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC @@ -381,6 +382,7 @@ GCTaskManager::GCTaskManager(uint workers) : _workers(workers), _active_workers(0), _idle_workers(0), + _created_workers(0), _ndc(NULL) { initialize(); } @@ -389,10 +391,28 @@ GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : _workers(workers), _active_workers(0), _idle_workers(0), + _created_workers(0), _ndc(ndc) { initialize(); } +GCTaskThread* GCTaskManager::install_worker(uint t) { + GCTaskThread* new_worker = GCTaskThread::create(this, t, _processor_assignment[t]); + set_thread(t, new_worker); + return new_worker; +} + +void GCTaskManager::add_workers(bool initializing) { + os::ThreadType worker_type = os::pgc_thread; + _created_workers = WorkerManager::add_workers(this, + _active_workers, + (uint) _workers, + _created_workers, + worker_type, + initializing); + _active_workers = MIN2(_created_workers, _active_workers); +} + void GCTaskManager::initialize() { if (TraceGCTaskManager) { tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); @@ -411,25 +431,27 @@ void GCTaskManager::initialize() { // Set up worker threads. // Distribute the workers among the available processors, // unless we were told not to, or if the os doesn't want to. - uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); + _processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); if (!BindGCTaskThreadsToCPUs || - !os::distribute_processes(workers(), processor_assignment)) { + !os::distribute_processes(workers(), _processor_assignment)) { for (uint a = 0; a < workers(); a += 1) { - processor_assignment[a] = sentinel_worker(); + _processor_assignment[a] = sentinel_worker(); } } + _thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers(), mtGC); - for (uint t = 0; t < workers(); t += 1) { - set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); + _active_workers = ParallelGCThreads; + if (UseDynamicNumberOfGCThreads && !FLAG_IS_CMDLINE(ParallelGCThreads)) { + _active_workers = 1U; } + if (TraceGCTaskThread) { tty->print("GCTaskManager::initialize: distribution:"); for (uint t = 0; t < workers(); t += 1) { - tty->print(" %u", processor_assignment[t]); + tty->print(" %u", _processor_assignment[t]); } tty->cr(); } - FREE_C_HEAP_ARRAY(uint, processor_assignment, mtGC); } reset_busy_workers(); set_unblocked(); @@ -441,9 +463,8 @@ void GCTaskManager::initialize() { reset_noop_tasks(); reset_barriers(); reset_emptied_queue(); - for (uint s = 0; s < workers(); s += 1) { - thread(s)->start(); - } + + add_workers(true); } GCTaskManager::~GCTaskManager() { @@ -454,13 +475,17 @@ GCTaskManager::~GCTaskManager() { WaitForBarrierGCTask::destroy(_idle_inactive_task); _idle_inactive_task = NULL; if (_thread != NULL) { - for (uint i = 0; i < workers(); i += 1) { + for (uint i = 0; i < created_workers(); i += 1) { GCTaskThread::destroy(thread(i)); set_thread(i, NULL); } FREE_C_HEAP_ARRAY(GCTaskThread*, _thread, mtGC); _thread = NULL; } + if (_processor_assignment != NULL) { + FREE_C_HEAP_ARRAY(uint, _processor_assignment, mtGC); + _processor_assignment = NULL; + } if (_resource_flag != NULL) { FREE_C_HEAP_ARRAY(bool, _resource_flag, mtGC); _resource_flag = NULL; @@ -487,6 +512,9 @@ void GCTaskManager::set_active_gang() { err_msg("all_workers_active() is incorrect: " "active %d ParallelGCThreads %d", active_workers(), ParallelGCThreads)); + _active_workers = MIN2(_active_workers, _workers); + // "add_workers" does not guarantee any additional workers + add_workers(false); if (TraceDynamicGCThreads) { gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " "all_workers_active() %d workers %d " @@ -518,7 +546,7 @@ void GCTaskManager::task_idle_workers() { // is starting). Try later to release enough idle_workers // to allow the desired number of active_workers. more_inactive_workers = - workers() - active_workers() - idle_workers(); + created_workers() - active_workers() - idle_workers(); if (more_inactive_workers < 0) { int reduced_active_workers = active_workers() + more_inactive_workers; set_active_workers(reduced_active_workers); @@ -528,7 +556,7 @@ void GCTaskManager::task_idle_workers() { gclog_or_tty->print_cr("JT: %d workers %d active %d " "idle %d more %d", Threads::number_of_non_daemon_threads(), - workers(), + created_workers(), active_workers(), idle_workers(), more_inactive_workers); @@ -539,7 +567,7 @@ void GCTaskManager::task_idle_workers() { q->enqueue(IdleGCTask::create_on_c_heap()); increment_idle_workers(); } - assert(workers() == active_workers() + idle_workers(), + assert(created_workers() == active_workers() + idle_workers(), "total workers should equal active + inactive"); add_list(q); // GCTaskQueue* q was created in a ResourceArea so a @@ -558,14 +586,15 @@ void GCTaskManager::release_idle_workers() { } void GCTaskManager::print_task_time_stamps() { - for(uint i=0; i<ParallelGCThreads; i++) { + uint num_thr = created_workers(); + for(uint i=0; i < num_thr; i++) { GCTaskThread* t = thread(i); t->print_task_time_stamps(); } } void GCTaskManager::print_threads_on(outputStream* st) { - uint num_thr = workers(); + uint num_thr = created_workers(); for (uint i = 0; i < num_thr; i++) { thread(i)->print_on(st); st->cr(); @@ -574,19 +603,20 @@ void GCTaskManager::print_threads_on(outputStream* st) { void GCTaskManager::threads_do(ThreadClosure* tc) { assert(tc != NULL, "Null ThreadClosure"); - uint num_thr = workers(); + uint num_thr = created_workers(); for (uint i = 0; i < num_thr; i++) { tc->do_thread(thread(i)); } } GCTaskThread* GCTaskManager::thread(uint which) { - assert(which < workers(), "index out of bounds"); + assert(which < created_workers(), "index out of bounds"); assert(_thread[which] != NULL, "shouldn't have null thread"); return _thread[which]; } void GCTaskManager::set_thread(uint which, GCTaskThread* value) { + // "_created_workers" may not have been updated yet so use workers() assert(which < workers(), "index out of bounds"); assert(value != NULL, "shouldn't have null thread"); _thread[which] = value; @@ -753,7 +783,7 @@ uint GCTaskManager::decrement_busy_workers() { void GCTaskManager::release_all_resources() { // If you want this to be done atomically, do it in a BarrierGCTask. - for (uint i = 0; i < workers(); i += 1) { + for (uint i = 0; i < created_workers(); i += 1) { set_resource_flag(i, true); } } diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.hpp index 76b0ec92d..91d0cd3e6 100644 --- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.hpp +++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskManager.hpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it @@ -370,6 +370,7 @@ private: Monitor* _monitor; // Notification of changes. SynchronizedGCTaskQueue* _queue; // Queue of tasks. GCTaskThread** _thread; // Array of worker threads. + uint _created_workers; // Number of workers created. uint _active_workers; // Number of active workers. uint _busy_workers; // Number of busy workers. uint _blocking_worker; // The worker that's blocking. @@ -382,6 +383,8 @@ private: uint _noop_tasks; // Count of noop tasks. WaitForBarrierGCTask* _idle_inactive_task;// Task for inactive workers volatile uint _idle_workers; // Number of idled workers + uint* _processor_assignment; // Worker to cpu mappings. May + // be used lazily public: // Factory create and destroy methods. static GCTaskManager* create(uint workers) { @@ -566,6 +569,13 @@ protected: uint active_workers() const { return _active_workers; } + uint created_workers() const { + return _created_workers; + } + // Create a GC worker and install into GCTaskManager + GCTaskThread* install_worker(uint worker_id); + // Add GC workers as needed. + void add_workers(bool initializing); }; // diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp index 4454cd18d..e9813d7c1 100644 --- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp +++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.cpp @@ -44,9 +44,6 @@ GCTaskThread::GCTaskThread(GCTaskManager* manager, _time_stamps(NULL), _time_stamp_index(0) { - if (!os::create_thread(this, os::pgc_thread)) - vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GC thread. Out of system resources."); - if (PrintGCTaskTimeStamps) { _time_stamps = NEW_C_HEAP_ARRAY(GCTaskTimeStamp, GCTaskTimeStampEntries, mtGC); @@ -62,10 +59,6 @@ GCTaskThread::~GCTaskThread() { } } -void GCTaskThread::start() { - os::start_thread(this); -} - GCTaskTimeStamp* GCTaskThread::time_stamp_at(uint index) { guarantee(index < GCTaskTimeStampEntries, "increase GCTaskTimeStampEntries"); diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp index 0c17989a7d..c4c43a0fe3 100644 --- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp +++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/gcTaskThread.hpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2002, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it @@ -48,13 +48,14 @@ private: bool _is_working; // True if participating in GC tasks - public: // Factory create and destroy methods. static GCTaskThread* create(GCTaskManager* manager, uint which, uint processor_id) { return new GCTaskThread(manager, which, processor_id); } + +public: static void destroy(GCTaskThread* manager) { if (manager != NULL) { delete manager; @@ -65,8 +66,6 @@ private: return true; } virtual void run(); - // Methods. - void start(); void print_task_time_stamps(); diff --git a/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp b/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp index 3bfbddcb5..1e99e73e4 100644 --- a/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp +++ b/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.cpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2004, 2014, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2004, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it @@ -129,10 +129,7 @@ int AdaptiveSizePolicy::calc_default_active_workers(uintx total_workers, uintx max_active_workers = MAX2(active_workers_by_JT, active_workers_by_heap_size); - // Limit the number of workers to the the number created, - // (workers()). - new_active_workers = MIN2(max_active_workers, - (uintx) total_workers); + new_active_workers = MIN2(max_active_workers, (uintx) total_workers); // Increase GC workers instantly but decrease them more // slowly. @@ -167,7 +164,7 @@ int AdaptiveSizePolicy::calc_default_active_workers(uintx total_workers, } if (TraceDynamicGCThreads) { - gclog_or_tty->print_cr("GCTaskManager::calc_default_active_workers() : " + gclog_or_tty->print_cr("GCTaskManager::calc_default_active_workers() : " "active_workers(): %d new_active_workers: %d " "prev_active_workers: %d\n" " active_workers_by_JT: %d active_workers_by_heap_size: %d", diff --git a/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.hpp b/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.hpp index 2fca75fce..e0d160ac6 100644 --- a/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.hpp +++ b/hotspot/src/share/vm/gc_implementation/shared/adaptiveSizePolicy.hpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2004, 2016, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it diff --git a/hotspot/src/share/vm/gc_implementation/shared/workerManager.hpp b/hotspot/src/share/vm/gc_implementation/shared/workerManager.hpp new file mode 100644 index 000000000..1a840cf2b --- /dev/null +++ b/hotspot/src/share/vm/gc_implementation/shared/workerManager.hpp @@ -0,0 +1,77 @@ +/* + * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#ifndef SHARE_VM_GC_SHARED_WORKERMANAGER_HPP +#define SHARE_VM_GC_SHARED_WORKERMANAGER_HPP + +#include "gc_implementation/shared/adaptiveSizePolicy.hpp" + +class WorkerManager : public AllStatic { + public: + // Create additional workers as needed. + // active_workers - number of workers being requested for an upcoming + // parallel task. + // total_workers - total number of workers. This is the maximum + // number possible. + // created_workers - number of workers already created. This maybe + // less than, equal to, or greater than active workers. If greater than + // or equal to active_workers, nothing is done. + // worker_type - type of thread. + // initializing - true if this is called to get the initial number of + // GC workers. + // If initializing is true, do a vm exit if the workers cannot be created. + // The initializing = true case is for JVM start up and failing to + // create all the worker at start should considered a problem so exit. + // If initializing = false, there are already some number of worker + // threads and a failure would not be optimal but should not be fatal. + template <class WorkerType> + static uint add_workers (WorkerType* holder, + uint active_workers, + uint total_workers, + uint created_workers, + os::ThreadType worker_type, + bool initializing) { + uint start = created_workers; + uint end = MIN2(active_workers, total_workers); + for (uint worker_id = start; worker_id < end; worker_id += 1) { + WorkerThread* new_worker = holder->install_worker(worker_id); + assert(new_worker != NULL, "Failed to allocate GangWorker"); + if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) { + if(initializing) { + vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, + "Cannot create worker GC thread. Out of system resources."); + } + } + created_workers++; + os::start_thread(new_worker); + } + + gclog_or_tty->print_cr("AdaptiveSizePolicy::add_workers() : " + "active_workers: %u created_workers: %u", + active_workers, created_workers); + + return created_workers; + } +}; +#endif // SHARE_VM_GC_SHARED_WORKERMANAGER_HPP -- 2.19.0
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