author | jmasa |
Fri, 01 Aug 2014 15:40:12 -0700 | |
changeset 25905 | 04a3d83cc752 |
parent 24424 | 2658d7834c6e |
child 27880 | afb974a04396 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc_implementation/parallelScavenge/gcTaskManager.hpp" |
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#include "gc_implementation/parallelScavenge/gcTaskThread.hpp" |
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#include "gc_implementation/shared/adaptiveSizePolicy.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "runtime/mutex.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/orderAccess.inline.hpp" |
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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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// |
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// GCTask |
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// |
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||
41 |
const char* GCTask::Kind::to_string(kind value) { |
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const char* result = "unknown GCTask kind"; |
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switch (value) { |
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default: |
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result = "unknown GCTask kind"; |
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break; |
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case unknown_task: |
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result = "unknown task"; |
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break; |
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case ordinary_task: |
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result = "ordinary task"; |
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break; |
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case barrier_task: |
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result = "barrier task"; |
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break; |
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case noop_task: |
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result = "noop task"; |
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break; |
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case idle_task: |
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result = "idle task"; |
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break; |
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} |
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return result; |
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}; |
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||
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GCTask::GCTask() : |
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_kind(Kind::ordinary_task), |
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_affinity(GCTaskManager::sentinel_worker()){ |
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initialize(); |
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} |
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||
72 |
GCTask::GCTask(Kind::kind kind) : |
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_kind(kind), |
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_affinity(GCTaskManager::sentinel_worker()) { |
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initialize(); |
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} |
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||
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GCTask::GCTask(uint affinity) : |
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_kind(Kind::ordinary_task), |
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_affinity(affinity) { |
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initialize(); |
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} |
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||
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GCTask::GCTask(Kind::kind kind, uint affinity) : |
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_kind(kind), |
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_affinity(affinity) { |
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initialize(); |
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} |
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||
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void GCTask::initialize() { |
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_older = NULL; |
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_newer = NULL; |
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} |
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void GCTask::destruct() { |
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assert(older() == NULL, "shouldn't have an older task"); |
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assert(newer() == NULL, "shouldn't have a newer task"); |
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// Nothing to do. |
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} |
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NOT_PRODUCT( |
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void GCTask::print(const char* message) const { |
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tty->print(INTPTR_FORMAT " <- " INTPTR_FORMAT "(%u) -> " INTPTR_FORMAT, |
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newer(), this, affinity(), older()); |
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} |
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) |
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// |
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// GCTaskQueue |
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// |
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111 |
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112 |
GCTaskQueue* GCTaskQueue::create() { |
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GCTaskQueue* result = new GCTaskQueue(false); |
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if (TraceGCTaskQueue) { |
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tty->print_cr("GCTaskQueue::create()" |
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" returns " INTPTR_FORMAT, result); |
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} |
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return result; |
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} |
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||
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GCTaskQueue* GCTaskQueue::create_on_c_heap() { |
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GCTaskQueue* result = new(ResourceObj::C_HEAP, mtGC) GCTaskQueue(true); |
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if (TraceGCTaskQueue) { |
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tty->print_cr("GCTaskQueue::create_on_c_heap()" |
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" returns " INTPTR_FORMAT, |
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result); |
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} |
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return result; |
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} |
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||
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GCTaskQueue::GCTaskQueue(bool on_c_heap) : |
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_is_c_heap_obj(on_c_heap) { |
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initialize(); |
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if (TraceGCTaskQueue) { |
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tty->print_cr("[" INTPTR_FORMAT "]" |
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" GCTaskQueue::GCTaskQueue() constructor", |
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this); |
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} |
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} |
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140 |
||
141 |
void GCTaskQueue::destruct() { |
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// Nothing to do. |
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} |
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||
145 |
void GCTaskQueue::destroy(GCTaskQueue* that) { |
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if (TraceGCTaskQueue) { |
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tty->print_cr("[" INTPTR_FORMAT "]" |
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" GCTaskQueue::destroy()" |
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" is_c_heap_obj: %s", |
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that, |
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that->is_c_heap_obj() ? "true" : "false"); |
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} |
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// That instance may have been allocated as a CHeapObj, |
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// in which case we have to free it explicitly. |
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if (that != NULL) { |
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that->destruct(); |
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assert(that->is_empty(), "should be empty"); |
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if (that->is_c_heap_obj()) { |
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FreeHeap(that); |
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160 |
} |
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} |
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} |
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||
164 |
void GCTaskQueue::initialize() { |
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set_insert_end(NULL); |
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set_remove_end(NULL); |
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set_length(0); |
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} |
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169 |
||
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// Enqueue one task. |
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171 |
void GCTaskQueue::enqueue(GCTask* task) { |
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if (TraceGCTaskQueue) { |
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tty->print_cr("[" INTPTR_FORMAT "]" |
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" GCTaskQueue::enqueue(task: " |
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INTPTR_FORMAT ")", |
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this, task); |
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print("before:"); |
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} |
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assert(task != NULL, "shouldn't have null task"); |
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180 |
assert(task->older() == NULL, "shouldn't be on queue"); |
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assert(task->newer() == NULL, "shouldn't be on queue"); |
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task->set_newer(NULL); |
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task->set_older(insert_end()); |
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184 |
if (is_empty()) { |
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set_remove_end(task); |
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186 |
} else { |
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insert_end()->set_newer(task); |
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} |
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set_insert_end(task); |
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increment_length(); |
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verify_length(); |
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if (TraceGCTaskQueue) { |
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print("after:"); |
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} |
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} |
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||
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// Enqueue a whole list of tasks. Empties the argument list. |
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198 |
void GCTaskQueue::enqueue(GCTaskQueue* list) { |
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if (TraceGCTaskQueue) { |
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tty->print_cr("[" INTPTR_FORMAT "]" |
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" GCTaskQueue::enqueue(list: " |
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INTPTR_FORMAT ")", |
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this, list); |
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print("before:"); |
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list->print("list:"); |
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} |
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if (list->is_empty()) { |
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// Enqueueing the empty list: nothing to do. |
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return; |
210 |
} |
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uint list_length = list->length(); |
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if (is_empty()) { |
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// Enqueueing to empty list: just acquire elements. |
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set_insert_end(list->insert_end()); |
215 |
set_remove_end(list->remove_end()); |
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set_length(list_length); |
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} else { |
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// Prepend argument list to our queue. |
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list->remove_end()->set_older(insert_end()); |
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insert_end()->set_newer(list->remove_end()); |
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set_insert_end(list->insert_end()); |
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set_length(length() + list_length); |
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// empty the argument list. |
224 |
} |
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list->initialize(); |
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if (TraceGCTaskQueue) { |
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print("after:"); |
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list->print("list:"); |
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} |
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verify_length(); |
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} |
232 |
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// Dequeue one task. |
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GCTask* GCTaskQueue::dequeue() { |
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if (TraceGCTaskQueue) { |
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tty->print_cr("[" INTPTR_FORMAT "]" |
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" GCTaskQueue::dequeue()", this); |
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print("before:"); |
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} |
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assert(!is_empty(), "shouldn't dequeue from empty list"); |
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GCTask* result = remove(); |
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assert(result != NULL, "shouldn't have NULL task"); |
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if (TraceGCTaskQueue) { |
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244 |
tty->print_cr(" return: " INTPTR_FORMAT, result); |
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print("after:"); |
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246 |
} |
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247 |
return result; |
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248 |
} |
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249 |
||
250 |
// Dequeue one task, preferring one with affinity. |
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251 |
GCTask* GCTaskQueue::dequeue(uint affinity) { |
|
252 |
if (TraceGCTaskQueue) { |
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253 |
tty->print_cr("[" INTPTR_FORMAT "]" |
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254 |
" GCTaskQueue::dequeue(%u)", this, affinity); |
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255 |
print("before:"); |
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256 |
} |
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257 |
assert(!is_empty(), "shouldn't dequeue from empty list"); |
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258 |
// Look down to the next barrier for a task with this affinity. |
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259 |
GCTask* result = NULL; |
|
260 |
for (GCTask* element = remove_end(); |
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261 |
element != NULL; |
|
262 |
element = element->newer()) { |
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263 |
if (element->is_barrier_task()) { |
|
264 |
// Don't consider barrier tasks, nor past them. |
|
265 |
result = NULL; |
|
266 |
break; |
|
267 |
} |
|
268 |
if (element->affinity() == affinity) { |
|
269 |
result = remove(element); |
|
270 |
break; |
|
271 |
} |
|
272 |
} |
|
273 |
// If we didn't find anything with affinity, just take the next task. |
|
274 |
if (result == NULL) { |
|
275 |
result = remove(); |
|
276 |
} |
|
277 |
if (TraceGCTaskQueue) { |
|
278 |
tty->print_cr(" return: " INTPTR_FORMAT, result); |
|
279 |
print("after:"); |
|
280 |
} |
|
281 |
return result; |
|
282 |
} |
|
283 |
||
284 |
GCTask* GCTaskQueue::remove() { |
|
285 |
// Dequeue from remove end. |
|
286 |
GCTask* result = remove_end(); |
|
287 |
assert(result != NULL, "shouldn't have null task"); |
|
288 |
assert(result->older() == NULL, "not the remove_end"); |
|
289 |
set_remove_end(result->newer()); |
|
290 |
if (remove_end() == NULL) { |
|
291 |
assert(insert_end() == result, "not a singleton"); |
|
292 |
set_insert_end(NULL); |
|
293 |
} else { |
|
294 |
remove_end()->set_older(NULL); |
|
295 |
} |
|
296 |
result->set_newer(NULL); |
|
297 |
decrement_length(); |
|
298 |
assert(result->newer() == NULL, "shouldn't be on queue"); |
|
299 |
assert(result->older() == NULL, "shouldn't be on queue"); |
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verify_length(); |
1 | 301 |
return result; |
302 |
} |
|
303 |
||
304 |
GCTask* GCTaskQueue::remove(GCTask* task) { |
|
305 |
// This is slightly more work, and has slightly fewer asserts |
|
306 |
// than removing from the remove end. |
|
307 |
assert(task != NULL, "shouldn't have null task"); |
|
308 |
GCTask* result = task; |
|
309 |
if (result->newer() != NULL) { |
|
310 |
result->newer()->set_older(result->older()); |
|
311 |
} else { |
|
312 |
assert(insert_end() == result, "not youngest"); |
|
313 |
set_insert_end(result->older()); |
|
314 |
} |
|
315 |
if (result->older() != NULL) { |
|
316 |
result->older()->set_newer(result->newer()); |
|
317 |
} else { |
|
318 |
assert(remove_end() == result, "not oldest"); |
|
319 |
set_remove_end(result->newer()); |
|
320 |
} |
|
321 |
result->set_newer(NULL); |
|
322 |
result->set_older(NULL); |
|
323 |
decrement_length(); |
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324 |
verify_length(); |
1 | 325 |
return result; |
326 |
} |
|
327 |
||
328 |
NOT_PRODUCT( |
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// Count the elements in the queue and verify the length against |
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// that count. |
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331 |
void GCTaskQueue::verify_length() const { |
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uint count = 0; |
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333 |
for (GCTask* element = insert_end(); |
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element != NULL; |
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element = element->older()) { |
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336 |
|
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337 |
count++; |
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338 |
} |
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339 |
assert(count == length(), "Length does not match queue"); |
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340 |
} |
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341 |
|
1 | 342 |
void GCTaskQueue::print(const char* message) const { |
343 |
tty->print_cr("[" INTPTR_FORMAT "] GCTaskQueue:" |
|
344 |
" insert_end: " INTPTR_FORMAT |
|
345 |
" remove_end: " INTPTR_FORMAT |
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346 |
" length: %d" |
1 | 347 |
" %s", |
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348 |
this, insert_end(), remove_end(), length(), message); |
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349 |
uint count = 0; |
1 | 350 |
for (GCTask* element = insert_end(); |
351 |
element != NULL; |
|
352 |
element = element->older()) { |
|
353 |
element->print(" "); |
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354 |
count++; |
1 | 355 |
tty->cr(); |
356 |
} |
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357 |
tty->print("Total tasks: %d", count); |
1 | 358 |
} |
359 |
) |
|
360 |
||
361 |
// |
|
362 |
// SynchronizedGCTaskQueue |
|
363 |
// |
|
364 |
||
365 |
SynchronizedGCTaskQueue::SynchronizedGCTaskQueue(GCTaskQueue* queue_arg, |
|
366 |
Monitor * lock_arg) : |
|
367 |
_unsynchronized_queue(queue_arg), |
|
368 |
_lock(lock_arg) { |
|
369 |
assert(unsynchronized_queue() != NULL, "null queue"); |
|
370 |
assert(lock() != NULL, "null lock"); |
|
371 |
} |
|
372 |
||
373 |
SynchronizedGCTaskQueue::~SynchronizedGCTaskQueue() { |
|
374 |
// Nothing to do. |
|
375 |
} |
|
376 |
||
377 |
// |
|
378 |
// GCTaskManager |
|
379 |
// |
|
380 |
GCTaskManager::GCTaskManager(uint workers) : |
|
381 |
_workers(workers), |
|
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382 |
_active_workers(0), |
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383 |
_idle_workers(0), |
1 | 384 |
_ndc(NULL) { |
385 |
initialize(); |
|
386 |
} |
|
387 |
||
388 |
GCTaskManager::GCTaskManager(uint workers, NotifyDoneClosure* ndc) : |
|
389 |
_workers(workers), |
|
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390 |
_active_workers(0), |
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391 |
_idle_workers(0), |
1 | 392 |
_ndc(ndc) { |
393 |
initialize(); |
|
394 |
} |
|
395 |
||
396 |
void GCTaskManager::initialize() { |
|
397 |
if (TraceGCTaskManager) { |
|
398 |
tty->print_cr("GCTaskManager::initialize: workers: %u", workers()); |
|
399 |
} |
|
400 |
assert(workers() != 0, "no workers"); |
|
401 |
_monitor = new Monitor(Mutex::barrier, // rank |
|
402 |
"GCTaskManager monitor", // name |
|
403 |
Mutex::_allow_vm_block_flag); // allow_vm_block |
|
404 |
// The queue for the GCTaskManager must be a CHeapObj. |
|
405 |
GCTaskQueue* unsynchronized_queue = GCTaskQueue::create_on_c_heap(); |
|
406 |
_queue = SynchronizedGCTaskQueue::create(unsynchronized_queue, lock()); |
|
407 |
_noop_task = NoopGCTask::create_on_c_heap(); |
|
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408 |
_idle_inactive_task = WaitForBarrierGCTask::create_on_c_heap(); |
13195 | 409 |
_resource_flag = NEW_C_HEAP_ARRAY(bool, workers(), mtGC); |
1 | 410 |
{ |
411 |
// Set up worker threads. |
|
412 |
// Distribute the workers among the available processors, |
|
413 |
// unless we were told not to, or if the os doesn't want to. |
|
13195 | 414 |
uint* processor_assignment = NEW_C_HEAP_ARRAY(uint, workers(), mtGC); |
1 | 415 |
if (!BindGCTaskThreadsToCPUs || |
416 |
!os::distribute_processes(workers(), processor_assignment)) { |
|
417 |
for (uint a = 0; a < workers(); a += 1) { |
|
418 |
processor_assignment[a] = sentinel_worker(); |
|
419 |
} |
|
420 |
} |
|
13195 | 421 |
_thread = NEW_C_HEAP_ARRAY(GCTaskThread*, workers(), mtGC); |
1 | 422 |
for (uint t = 0; t < workers(); t += 1) { |
423 |
set_thread(t, GCTaskThread::create(this, t, processor_assignment[t])); |
|
424 |
} |
|
425 |
if (TraceGCTaskThread) { |
|
426 |
tty->print("GCTaskManager::initialize: distribution:"); |
|
427 |
for (uint t = 0; t < workers(); t += 1) { |
|
428 |
tty->print(" %u", processor_assignment[t]); |
|
429 |
} |
|
430 |
tty->cr(); |
|
431 |
} |
|
13195 | 432 |
FREE_C_HEAP_ARRAY(uint, processor_assignment, mtGC); |
1 | 433 |
} |
434 |
reset_busy_workers(); |
|
435 |
set_unblocked(); |
|
436 |
for (uint w = 0; w < workers(); w += 1) { |
|
437 |
set_resource_flag(w, false); |
|
438 |
} |
|
439 |
reset_delivered_tasks(); |
|
440 |
reset_completed_tasks(); |
|
441 |
reset_noop_tasks(); |
|
442 |
reset_barriers(); |
|
443 |
reset_emptied_queue(); |
|
444 |
for (uint s = 0; s < workers(); s += 1) { |
|
445 |
thread(s)->start(); |
|
446 |
} |
|
447 |
} |
|
448 |
||
449 |
GCTaskManager::~GCTaskManager() { |
|
450 |
assert(busy_workers() == 0, "still have busy workers"); |
|
451 |
assert(queue()->is_empty(), "still have queued work"); |
|
452 |
NoopGCTask::destroy(_noop_task); |
|
453 |
_noop_task = NULL; |
|
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454 |
WaitForBarrierGCTask::destroy(_idle_inactive_task); |
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455 |
_idle_inactive_task = NULL; |
1 | 456 |
if (_thread != NULL) { |
457 |
for (uint i = 0; i < workers(); i += 1) { |
|
458 |
GCTaskThread::destroy(thread(i)); |
|
459 |
set_thread(i, NULL); |
|
460 |
} |
|
13195 | 461 |
FREE_C_HEAP_ARRAY(GCTaskThread*, _thread, mtGC); |
1 | 462 |
_thread = NULL; |
463 |
} |
|
464 |
if (_resource_flag != NULL) { |
|
13195 | 465 |
FREE_C_HEAP_ARRAY(bool, _resource_flag, mtGC); |
1 | 466 |
_resource_flag = NULL; |
467 |
} |
|
468 |
if (queue() != NULL) { |
|
469 |
GCTaskQueue* unsynchronized_queue = queue()->unsynchronized_queue(); |
|
470 |
GCTaskQueue::destroy(unsynchronized_queue); |
|
471 |
SynchronizedGCTaskQueue::destroy(queue()); |
|
472 |
_queue = NULL; |
|
473 |
} |
|
474 |
if (monitor() != NULL) { |
|
475 |
delete monitor(); |
|
476 |
_monitor = NULL; |
|
477 |
} |
|
478 |
} |
|
479 |
||
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|
480 |
void GCTaskManager::set_active_gang() { |
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|
481 |
_active_workers = |
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|
482 |
AdaptiveSizePolicy::calc_active_workers(workers(), |
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|
483 |
active_workers(), |
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|
484 |
Threads::number_of_non_daemon_threads()); |
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|
485 |
|
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|
486 |
assert(!all_workers_active() || active_workers() == ParallelGCThreads, |
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|
487 |
err_msg("all_workers_active() is incorrect: " |
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|
488 |
"active %d ParallelGCThreads %d", active_workers(), |
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|
489 |
ParallelGCThreads)); |
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|
490 |
if (TraceDynamicGCThreads) { |
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|
491 |
gclog_or_tty->print_cr("GCTaskManager::set_active_gang(): " |
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|
492 |
"all_workers_active() %d workers %d " |
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|
493 |
"active %d ParallelGCThreads " UINTX_FORMAT, |
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|
494 |
all_workers_active(), workers(), active_workers(), |
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|
495 |
ParallelGCThreads); |
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|
496 |
} |
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|
497 |
} |
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|
498 |
|
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|
499 |
// Create IdleGCTasks for inactive workers. |
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|
500 |
// Creates tasks in a ResourceArea and assumes |
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|
501 |
// an appropriate ResourceMark. |
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|
502 |
void GCTaskManager::task_idle_workers() { |
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|
503 |
{ |
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|
504 |
int more_inactive_workers = 0; |
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|
505 |
{ |
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|
506 |
// Stop any idle tasks from exiting their IdleGCTask's |
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|
507 |
// and get the count for additional IdleGCTask's under |
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|
508 |
// the GCTaskManager's monitor so that the "more_inactive_workers" |
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|
509 |
// count is correct. |
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|
510 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
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|
511 |
_idle_inactive_task->set_should_wait(true); |
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|
512 |
// active_workers are a number being requested. idle_workers |
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|
513 |
// are the number currently idle. If all the workers are being |
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|
514 |
// requested to be active but some are already idle, reduce |
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|
515 |
// the number of active_workers to be consistent with the |
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|
516 |
// number of idle_workers. The idle_workers are stuck in |
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|
517 |
// idle tasks and will no longer be release (since a new GC |
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|
518 |
// is starting). Try later to release enough idle_workers |
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|
519 |
// to allow the desired number of active_workers. |
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|
520 |
more_inactive_workers = |
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|
521 |
workers() - active_workers() - idle_workers(); |
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|
522 |
if (more_inactive_workers < 0) { |
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|
523 |
int reduced_active_workers = active_workers() + more_inactive_workers; |
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|
524 |
set_active_workers(reduced_active_workers); |
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|
525 |
more_inactive_workers = 0; |
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|
526 |
} |
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|
527 |
if (TraceDynamicGCThreads) { |
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|
528 |
gclog_or_tty->print_cr("JT: %d workers %d active %d " |
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|
529 |
"idle %d more %d", |
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|
530 |
Threads::number_of_non_daemon_threads(), |
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|
531 |
workers(), |
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|
532 |
active_workers(), |
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|
533 |
idle_workers(), |
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|
534 |
more_inactive_workers); |
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|
535 |
} |
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|
536 |
} |
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|
537 |
GCTaskQueue* q = GCTaskQueue::create(); |
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|
538 |
for(uint i = 0; i < (uint) more_inactive_workers; i++) { |
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|
539 |
q->enqueue(IdleGCTask::create_on_c_heap()); |
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|
540 |
increment_idle_workers(); |
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|
541 |
} |
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|
542 |
assert(workers() == active_workers() + idle_workers(), |
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|
543 |
"total workers should equal active + inactive"); |
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|
544 |
add_list(q); |
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|
545 |
// GCTaskQueue* q was created in a ResourceArea so a |
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|
546 |
// destroy() call is not needed. |
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|
547 |
} |
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|
548 |
} |
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|
549 |
|
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|
550 |
void GCTaskManager::release_idle_workers() { |
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|
551 |
{ |
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|
552 |
MutexLockerEx ml(monitor(), |
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|
553 |
Mutex::_no_safepoint_check_flag); |
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|
554 |
_idle_inactive_task->set_should_wait(false); |
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|
555 |
monitor()->notify_all(); |
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|
556 |
// Release monitor |
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|
557 |
} |
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|
558 |
} |
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|
559 |
|
1 | 560 |
void GCTaskManager::print_task_time_stamps() { |
561 |
for(uint i=0; i<ParallelGCThreads; i++) { |
|
562 |
GCTaskThread* t = thread(i); |
|
563 |
t->print_task_time_stamps(); |
|
564 |
} |
|
565 |
} |
|
566 |
||
567 |
void GCTaskManager::print_threads_on(outputStream* st) { |
|
568 |
uint num_thr = workers(); |
|
569 |
for (uint i = 0; i < num_thr; i++) { |
|
570 |
thread(i)->print_on(st); |
|
571 |
st->cr(); |
|
572 |
} |
|
573 |
} |
|
574 |
||
575 |
void GCTaskManager::threads_do(ThreadClosure* tc) { |
|
576 |
assert(tc != NULL, "Null ThreadClosure"); |
|
577 |
uint num_thr = workers(); |
|
578 |
for (uint i = 0; i < num_thr; i++) { |
|
579 |
tc->do_thread(thread(i)); |
|
580 |
} |
|
581 |
} |
|
582 |
||
583 |
GCTaskThread* GCTaskManager::thread(uint which) { |
|
584 |
assert(which < workers(), "index out of bounds"); |
|
585 |
assert(_thread[which] != NULL, "shouldn't have null thread"); |
|
586 |
return _thread[which]; |
|
587 |
} |
|
588 |
||
589 |
void GCTaskManager::set_thread(uint which, GCTaskThread* value) { |
|
590 |
assert(which < workers(), "index out of bounds"); |
|
591 |
assert(value != NULL, "shouldn't have null thread"); |
|
592 |
_thread[which] = value; |
|
593 |
} |
|
594 |
||
595 |
void GCTaskManager::add_task(GCTask* task) { |
|
596 |
assert(task != NULL, "shouldn't have null task"); |
|
597 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
|
598 |
if (TraceGCTaskManager) { |
|
599 |
tty->print_cr("GCTaskManager::add_task(" INTPTR_FORMAT " [%s])", |
|
600 |
task, GCTask::Kind::to_string(task->kind())); |
|
601 |
} |
|
602 |
queue()->enqueue(task); |
|
603 |
// Notify with the lock held to avoid missed notifies. |
|
604 |
if (TraceGCTaskManager) { |
|
605 |
tty->print_cr(" GCTaskManager::add_task (%s)->notify_all", |
|
606 |
monitor()->name()); |
|
607 |
} |
|
608 |
(void) monitor()->notify_all(); |
|
609 |
// Release monitor(). |
|
610 |
} |
|
611 |
||
612 |
void GCTaskManager::add_list(GCTaskQueue* list) { |
|
613 |
assert(list != NULL, "shouldn't have null task"); |
|
614 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
|
615 |
if (TraceGCTaskManager) { |
|
616 |
tty->print_cr("GCTaskManager::add_list(%u)", list->length()); |
|
617 |
} |
|
618 |
queue()->enqueue(list); |
|
619 |
// Notify with the lock held to avoid missed notifies. |
|
620 |
if (TraceGCTaskManager) { |
|
621 |
tty->print_cr(" GCTaskManager::add_list (%s)->notify_all", |
|
622 |
monitor()->name()); |
|
623 |
} |
|
624 |
(void) monitor()->notify_all(); |
|
625 |
// Release monitor(). |
|
626 |
} |
|
627 |
||
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628 |
// GC workers wait in get_task() for new work to be added |
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|
629 |
// to the GCTaskManager's queue. When new work is added, |
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|
630 |
// a notify is sent to the waiting GC workers which then |
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|
631 |
// compete to get tasks. If a GC worker wakes up and there |
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|
632 |
// is no work on the queue, it is given a noop_task to execute |
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|
633 |
// and then loops to find more work. |
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|
634 |
|
1 | 635 |
GCTask* GCTaskManager::get_task(uint which) { |
636 |
GCTask* result = NULL; |
|
637 |
// Grab the queue lock. |
|
638 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
|
639 |
// Wait while the queue is block or |
|
640 |
// there is nothing to do, except maybe release resources. |
|
641 |
while (is_blocked() || |
|
642 |
(queue()->is_empty() && !should_release_resources(which))) { |
|
643 |
if (TraceGCTaskManager) { |
|
644 |
tty->print_cr("GCTaskManager::get_task(%u)" |
|
645 |
" blocked: %s" |
|
646 |
" empty: %s" |
|
647 |
" release: %s", |
|
648 |
which, |
|
649 |
is_blocked() ? "true" : "false", |
|
650 |
queue()->is_empty() ? "true" : "false", |
|
651 |
should_release_resources(which) ? "true" : "false"); |
|
652 |
tty->print_cr(" => (%s)->wait()", |
|
653 |
monitor()->name()); |
|
654 |
} |
|
655 |
monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
|
656 |
} |
|
657 |
// We've reacquired the queue lock here. |
|
658 |
// Figure out which condition caused us to exit the loop above. |
|
659 |
if (!queue()->is_empty()) { |
|
660 |
if (UseGCTaskAffinity) { |
|
661 |
result = queue()->dequeue(which); |
|
662 |
} else { |
|
663 |
result = queue()->dequeue(); |
|
664 |
} |
|
665 |
if (result->is_barrier_task()) { |
|
666 |
assert(which != sentinel_worker(), |
|
667 |
"blocker shouldn't be bogus"); |
|
668 |
set_blocking_worker(which); |
|
669 |
} |
|
670 |
} else { |
|
671 |
// The queue is empty, but we were woken up. |
|
672 |
// Just hand back a Noop task, |
|
673 |
// in case someone wanted us to release resources, or whatever. |
|
674 |
result = noop_task(); |
|
675 |
increment_noop_tasks(); |
|
676 |
} |
|
677 |
assert(result != NULL, "shouldn't have null task"); |
|
678 |
if (TraceGCTaskManager) { |
|
679 |
tty->print_cr("GCTaskManager::get_task(%u) => " INTPTR_FORMAT " [%s]", |
|
680 |
which, result, GCTask::Kind::to_string(result->kind())); |
|
681 |
tty->print_cr(" %s", result->name()); |
|
682 |
} |
|
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|
683 |
if (!result->is_idle_task()) { |
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|
684 |
increment_busy_workers(); |
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|
685 |
increment_delivered_tasks(); |
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|
686 |
} |
1 | 687 |
return result; |
688 |
// Release monitor(). |
|
689 |
} |
|
690 |
||
691 |
void GCTaskManager::note_completion(uint which) { |
|
692 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
|
693 |
if (TraceGCTaskManager) { |
|
694 |
tty->print_cr("GCTaskManager::note_completion(%u)", which); |
|
695 |
} |
|
696 |
// If we are blocked, check if the completing thread is the blocker. |
|
697 |
if (blocking_worker() == which) { |
|
698 |
assert(blocking_worker() != sentinel_worker(), |
|
699 |
"blocker shouldn't be bogus"); |
|
700 |
increment_barriers(); |
|
701 |
set_unblocked(); |
|
702 |
} |
|
703 |
increment_completed_tasks(); |
|
704 |
uint active = decrement_busy_workers(); |
|
705 |
if ((active == 0) && (queue()->is_empty())) { |
|
706 |
increment_emptied_queue(); |
|
707 |
if (TraceGCTaskManager) { |
|
708 |
tty->print_cr(" GCTaskManager::note_completion(%u) done", which); |
|
709 |
} |
|
710 |
// Notify client that we are done. |
|
711 |
NotifyDoneClosure* ndc = notify_done_closure(); |
|
712 |
if (ndc != NULL) { |
|
713 |
ndc->notify(this); |
|
714 |
} |
|
715 |
} |
|
716 |
if (TraceGCTaskManager) { |
|
717 |
tty->print_cr(" GCTaskManager::note_completion(%u) (%s)->notify_all", |
|
718 |
which, monitor()->name()); |
|
719 |
tty->print_cr(" " |
|
720 |
" blocked: %s" |
|
721 |
" empty: %s" |
|
722 |
" release: %s", |
|
723 |
is_blocked() ? "true" : "false", |
|
724 |
queue()->is_empty() ? "true" : "false", |
|
725 |
should_release_resources(which) ? "true" : "false"); |
|
726 |
tty->print_cr(" " |
|
727 |
" delivered: %u" |
|
728 |
" completed: %u" |
|
729 |
" barriers: %u" |
|
730 |
" emptied: %u", |
|
731 |
delivered_tasks(), |
|
732 |
completed_tasks(), |
|
733 |
barriers(), |
|
734 |
emptied_queue()); |
|
735 |
} |
|
736 |
// Tell everyone that a task has completed. |
|
737 |
(void) monitor()->notify_all(); |
|
738 |
// Release monitor(). |
|
739 |
} |
|
740 |
||
741 |
uint GCTaskManager::increment_busy_workers() { |
|
742 |
assert(queue()->own_lock(), "don't own the lock"); |
|
743 |
_busy_workers += 1; |
|
744 |
return _busy_workers; |
|
745 |
} |
|
746 |
||
747 |
uint GCTaskManager::decrement_busy_workers() { |
|
748 |
assert(queue()->own_lock(), "don't own the lock"); |
|
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|
749 |
assert(_busy_workers > 0, "About to make a mistake"); |
1 | 750 |
_busy_workers -= 1; |
751 |
return _busy_workers; |
|
752 |
} |
|
753 |
||
754 |
void GCTaskManager::release_all_resources() { |
|
755 |
// If you want this to be done atomically, do it in a BarrierGCTask. |
|
756 |
for (uint i = 0; i < workers(); i += 1) { |
|
757 |
set_resource_flag(i, true); |
|
758 |
} |
|
759 |
} |
|
760 |
||
761 |
bool GCTaskManager::should_release_resources(uint which) { |
|
762 |
// This can be done without a lock because each thread reads one element. |
|
763 |
return resource_flag(which); |
|
764 |
} |
|
765 |
||
766 |
void GCTaskManager::note_release(uint which) { |
|
767 |
// This can be done without a lock because each thread writes one element. |
|
768 |
set_resource_flag(which, false); |
|
769 |
} |
|
770 |
||
11174
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|
771 |
// "list" contains tasks that are ready to execute. Those |
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|
772 |
// tasks are added to the GCTaskManager's queue of tasks and |
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|
773 |
// then the GC workers are notified that there is new work to |
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|
774 |
// do. |
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|
775 |
// |
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|
776 |
// Typically different types of tasks can be added to the "list". |
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|
777 |
// For example in PSScavenge OldToYoungRootsTask, SerialOldToYoungRootsTask, |
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|
778 |
// ScavengeRootsTask, and StealTask tasks are all added to the list |
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|
779 |
// and then the GC workers are notified of new work. The tasks are |
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|
780 |
// handed out in the order in which they are added to the list |
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|
781 |
// (although execution is not necessarily in that order). As long |
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|
782 |
// as any tasks are running the GCTaskManager will wait for execution |
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|
783 |
// to complete. GC workers that execute a stealing task remain in |
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|
784 |
// the stealing task until all stealing tasks have completed. The load |
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|
785 |
// balancing afforded by the stealing tasks work best if the stealing |
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|
786 |
// tasks are added last to the list. |
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|
787 |
|
1 | 788 |
void GCTaskManager::execute_and_wait(GCTaskQueue* list) { |
789 |
WaitForBarrierGCTask* fin = WaitForBarrierGCTask::create(); |
|
790 |
list->enqueue(fin); |
|
11208
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|
791 |
// The barrier task will be read by one of the GC |
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|
792 |
// workers once it is added to the list of tasks. |
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|
793 |
// Be sure that is globally visible before the |
101816314520
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|
794 |
// GC worker reads it (which is after the task is added |
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|
795 |
// to the list of tasks below). |
101816314520
7119584: UseParallelGC barrier task can be overwritten.
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changeset
|
796 |
OrderAccess::storestore(); |
1 | 797 |
add_list(list); |
11174
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|
798 |
fin->wait_for(true /* reset */); |
1 | 799 |
// We have to release the barrier tasks! |
800 |
WaitForBarrierGCTask::destroy(fin); |
|
801 |
} |
|
802 |
||
803 |
bool GCTaskManager::resource_flag(uint which) { |
|
804 |
assert(which < workers(), "index out of bounds"); |
|
805 |
return _resource_flag[which]; |
|
806 |
} |
|
807 |
||
808 |
void GCTaskManager::set_resource_flag(uint which, bool value) { |
|
809 |
assert(which < workers(), "index out of bounds"); |
|
810 |
_resource_flag[which] = value; |
|
811 |
} |
|
812 |
||
813 |
// |
|
814 |
// NoopGCTask |
|
815 |
// |
|
816 |
||
817 |
NoopGCTask* NoopGCTask::create() { |
|
818 |
NoopGCTask* result = new NoopGCTask(false); |
|
819 |
return result; |
|
820 |
} |
|
821 |
||
822 |
NoopGCTask* NoopGCTask::create_on_c_heap() { |
|
13195 | 823 |
NoopGCTask* result = new(ResourceObj::C_HEAP, mtGC) NoopGCTask(true); |
1 | 824 |
return result; |
825 |
} |
|
826 |
||
827 |
void NoopGCTask::destroy(NoopGCTask* that) { |
|
828 |
if (that != NULL) { |
|
829 |
that->destruct(); |
|
830 |
if (that->is_c_heap_obj()) { |
|
831 |
FreeHeap(that); |
|
832 |
} |
|
833 |
} |
|
834 |
} |
|
835 |
||
836 |
void NoopGCTask::destruct() { |
|
837 |
// This has to know it's superclass structure, just like the constructor. |
|
838 |
this->GCTask::destruct(); |
|
839 |
// Nothing else to do. |
|
840 |
} |
|
841 |
||
842 |
// |
|
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|
843 |
// IdleGCTask |
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|
844 |
// |
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|
845 |
|
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|
846 |
IdleGCTask* IdleGCTask::create() { |
fccee5238e70
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|
847 |
IdleGCTask* result = new IdleGCTask(false); |
11208
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|
848 |
assert(UseDynamicNumberOfGCThreads, |
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|
849 |
"Should only be used with dynamic GC thread"); |
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|
850 |
return result; |
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|
851 |
} |
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|
852 |
|
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|
853 |
IdleGCTask* IdleGCTask::create_on_c_heap() { |
13195 | 854 |
IdleGCTask* result = new(ResourceObj::C_HEAP, mtGC) IdleGCTask(true); |
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|
855 |
assert(UseDynamicNumberOfGCThreads, |
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|
856 |
"Should only be used with dynamic GC thread"); |
11174
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|
857 |
return result; |
fccee5238e70
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|
858 |
} |
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changeset
|
859 |
|
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|
860 |
void IdleGCTask::do_it(GCTaskManager* manager, uint which) { |
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|
861 |
WaitForBarrierGCTask* wait_for_task = manager->idle_inactive_task(); |
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|
862 |
if (TraceGCTaskManager) { |
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|
863 |
tty->print_cr("[" INTPTR_FORMAT "]" |
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|
864 |
" IdleGCTask:::do_it()" |
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|
865 |
" should_wait: %s", |
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|
866 |
this, wait_for_task->should_wait() ? "true" : "false"); |
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|
867 |
} |
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|
868 |
MutexLockerEx ml(manager->monitor(), Mutex::_no_safepoint_check_flag); |
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|
869 |
if (TraceDynamicGCThreads) { |
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|
870 |
gclog_or_tty->print_cr("--- idle %d", which); |
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|
871 |
} |
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|
872 |
// Increment has to be done when the idle tasks are created. |
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|
873 |
// manager->increment_idle_workers(); |
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|
874 |
manager->monitor()->notify_all(); |
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|
875 |
while (wait_for_task->should_wait()) { |
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|
876 |
if (TraceGCTaskManager) { |
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|
877 |
tty->print_cr("[" INTPTR_FORMAT "]" |
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|
878 |
" IdleGCTask::do_it()" |
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|
879 |
" [" INTPTR_FORMAT "] (%s)->wait()", |
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|
880 |
this, manager->monitor(), manager->monitor()->name()); |
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|
881 |
} |
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|
882 |
manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
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|
883 |
} |
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|
884 |
manager->decrement_idle_workers(); |
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|
885 |
if (TraceDynamicGCThreads) { |
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|
886 |
gclog_or_tty->print_cr("--- release %d", which); |
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|
887 |
} |
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|
888 |
if (TraceGCTaskManager) { |
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|
889 |
tty->print_cr("[" INTPTR_FORMAT "]" |
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|
890 |
" IdleGCTask::do_it() returns" |
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|
891 |
" should_wait: %s", |
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|
892 |
this, wait_for_task->should_wait() ? "true" : "false"); |
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|
893 |
} |
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|
894 |
// Release monitor(). |
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|
895 |
} |
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|
896 |
|
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|
897 |
void IdleGCTask::destroy(IdleGCTask* that) { |
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|
898 |
if (that != NULL) { |
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|
899 |
that->destruct(); |
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|
900 |
if (that->is_c_heap_obj()) { |
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|
901 |
FreeHeap(that); |
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|
902 |
} |
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|
903 |
} |
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|
904 |
} |
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|
905 |
|
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|
906 |
void IdleGCTask::destruct() { |
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|
907 |
// This has to know it's superclass structure, just like the constructor. |
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|
908 |
this->GCTask::destruct(); |
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|
909 |
// Nothing else to do. |
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|
910 |
} |
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|
911 |
|
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|
912 |
// |
1 | 913 |
// BarrierGCTask |
914 |
// |
|
915 |
||
916 |
void BarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
|
917 |
// Wait for this to be the only busy worker. |
|
918 |
// ??? I thought of having a StackObj class |
|
919 |
// whose constructor would grab the lock and come to the barrier, |
|
920 |
// and whose destructor would release the lock, |
|
921 |
// but that seems like too much mechanism for two lines of code. |
|
922 |
MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
|
923 |
do_it_internal(manager, which); |
|
924 |
// Release manager->lock(). |
|
925 |
} |
|
926 |
||
927 |
void BarrierGCTask::do_it_internal(GCTaskManager* manager, uint which) { |
|
928 |
// Wait for this to be the only busy worker. |
|
929 |
assert(manager->monitor()->owned_by_self(), "don't own the lock"); |
|
930 |
assert(manager->is_blocked(), "manager isn't blocked"); |
|
931 |
while (manager->busy_workers() > 1) { |
|
932 |
if (TraceGCTaskManager) { |
|
933 |
tty->print_cr("BarrierGCTask::do_it(%u) waiting on %u workers", |
|
934 |
which, manager->busy_workers()); |
|
935 |
} |
|
936 |
manager->monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
|
937 |
} |
|
938 |
} |
|
939 |
||
940 |
void BarrierGCTask::destruct() { |
|
941 |
this->GCTask::destruct(); |
|
942 |
// Nothing else to do. |
|
943 |
} |
|
944 |
||
945 |
// |
|
946 |
// ReleasingBarrierGCTask |
|
947 |
// |
|
948 |
||
949 |
void ReleasingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
|
950 |
MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
|
951 |
do_it_internal(manager, which); |
|
952 |
manager->release_all_resources(); |
|
953 |
// Release manager->lock(). |
|
954 |
} |
|
955 |
||
956 |
void ReleasingBarrierGCTask::destruct() { |
|
957 |
this->BarrierGCTask::destruct(); |
|
958 |
// Nothing else to do. |
|
959 |
} |
|
960 |
||
961 |
// |
|
962 |
// NotifyingBarrierGCTask |
|
963 |
// |
|
964 |
||
965 |
void NotifyingBarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
|
966 |
MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
|
967 |
do_it_internal(manager, which); |
|
968 |
NotifyDoneClosure* ndc = notify_done_closure(); |
|
969 |
if (ndc != NULL) { |
|
970 |
ndc->notify(manager); |
|
971 |
} |
|
972 |
// Release manager->lock(). |
|
973 |
} |
|
974 |
||
975 |
void NotifyingBarrierGCTask::destruct() { |
|
976 |
this->BarrierGCTask::destruct(); |
|
977 |
// Nothing else to do. |
|
978 |
} |
|
979 |
||
980 |
// |
|
981 |
// WaitForBarrierGCTask |
|
982 |
// |
|
983 |
WaitForBarrierGCTask* WaitForBarrierGCTask::create() { |
|
984 |
WaitForBarrierGCTask* result = new WaitForBarrierGCTask(false); |
|
985 |
return result; |
|
986 |
} |
|
987 |
||
988 |
WaitForBarrierGCTask* WaitForBarrierGCTask::create_on_c_heap() { |
|
11174
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|
989 |
WaitForBarrierGCTask* result = |
13195 | 990 |
new (ResourceObj::C_HEAP, mtGC) WaitForBarrierGCTask(true); |
1 | 991 |
return result; |
992 |
} |
|
993 |
||
994 |
WaitForBarrierGCTask::WaitForBarrierGCTask(bool on_c_heap) : |
|
995 |
_is_c_heap_obj(on_c_heap) { |
|
996 |
_monitor = MonitorSupply::reserve(); |
|
997 |
set_should_wait(true); |
|
998 |
if (TraceGCTaskManager) { |
|
999 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1000 |
" WaitForBarrierGCTask::WaitForBarrierGCTask()" |
|
1001 |
" monitor: " INTPTR_FORMAT, |
|
1002 |
this, monitor()); |
|
1003 |
} |
|
1004 |
} |
|
1005 |
||
1006 |
void WaitForBarrierGCTask::destroy(WaitForBarrierGCTask* that) { |
|
1007 |
if (that != NULL) { |
|
1008 |
if (TraceGCTaskManager) { |
|
1009 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1010 |
" WaitForBarrierGCTask::destroy()" |
|
1011 |
" is_c_heap_obj: %s" |
|
1012 |
" monitor: " INTPTR_FORMAT, |
|
1013 |
that, |
|
1014 |
that->is_c_heap_obj() ? "true" : "false", |
|
1015 |
that->monitor()); |
|
1016 |
} |
|
1017 |
that->destruct(); |
|
1018 |
if (that->is_c_heap_obj()) { |
|
1019 |
FreeHeap(that); |
|
1020 |
} |
|
1021 |
} |
|
1022 |
} |
|
1023 |
||
1024 |
void WaitForBarrierGCTask::destruct() { |
|
1025 |
assert(monitor() != NULL, "monitor should not be NULL"); |
|
1026 |
if (TraceGCTaskManager) { |
|
1027 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1028 |
" WaitForBarrierGCTask::destruct()" |
|
1029 |
" monitor: " INTPTR_FORMAT, |
|
1030 |
this, monitor()); |
|
1031 |
} |
|
1032 |
this->BarrierGCTask::destruct(); |
|
1033 |
// Clean up that should be in the destructor, |
|
1034 |
// except that ResourceMarks don't call destructors. |
|
1035 |
if (monitor() != NULL) { |
|
1036 |
MonitorSupply::release(monitor()); |
|
1037 |
} |
|
1038 |
_monitor = (Monitor*) 0xDEAD000F; |
|
1039 |
} |
|
1040 |
||
1041 |
void WaitForBarrierGCTask::do_it(GCTaskManager* manager, uint which) { |
|
1042 |
if (TraceGCTaskManager) { |
|
1043 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1044 |
" WaitForBarrierGCTask::do_it() waiting for idle" |
|
1045 |
" monitor: " INTPTR_FORMAT, |
|
1046 |
this, monitor()); |
|
1047 |
} |
|
1048 |
{ |
|
1049 |
// First, wait for the barrier to arrive. |
|
1050 |
MutexLockerEx ml(manager->lock(), Mutex::_no_safepoint_check_flag); |
|
1051 |
do_it_internal(manager, which); |
|
1052 |
// Release manager->lock(). |
|
1053 |
} |
|
1054 |
{ |
|
1055 |
// Then notify the waiter. |
|
1056 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
|
1057 |
set_should_wait(false); |
|
1058 |
// Waiter doesn't miss the notify in the wait_for method |
|
1059 |
// since it checks the flag after grabbing the monitor. |
|
1060 |
if (TraceGCTaskManager) { |
|
1061 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1062 |
" WaitForBarrierGCTask::do_it()" |
|
1063 |
" [" INTPTR_FORMAT "] (%s)->notify_all()", |
|
1064 |
this, monitor(), monitor()->name()); |
|
1065 |
} |
|
1066 |
monitor()->notify_all(); |
|
1067 |
// Release monitor(). |
|
1068 |
} |
|
1069 |
} |
|
1070 |
||
11174
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|
1071 |
void WaitForBarrierGCTask::wait_for(bool reset) { |
1 | 1072 |
if (TraceGCTaskManager) { |
1073 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1074 |
" WaitForBarrierGCTask::wait_for()" |
|
1075 |
" should_wait: %s", |
|
1076 |
this, should_wait() ? "true" : "false"); |
|
1077 |
} |
|
1078 |
{ |
|
1079 |
// Grab the lock and check again. |
|
1080 |
MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); |
|
1081 |
while (should_wait()) { |
|
1082 |
if (TraceGCTaskManager) { |
|
1083 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1084 |
" WaitForBarrierGCTask::wait_for()" |
|
1085 |
" [" INTPTR_FORMAT "] (%s)->wait()", |
|
1086 |
this, monitor(), monitor()->name()); |
|
1087 |
} |
|
1088 |
monitor()->wait(Mutex::_no_safepoint_check_flag, 0); |
|
1089 |
} |
|
1090 |
// Reset the flag in case someone reuses this task. |
|
11174
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|
1091 |
if (reset) { |
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|
1092 |
set_should_wait(true); |
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|
1093 |
} |
1 | 1094 |
if (TraceGCTaskManager) { |
1095 |
tty->print_cr("[" INTPTR_FORMAT "]" |
|
1096 |
" WaitForBarrierGCTask::wait_for() returns" |
|
1097 |
" should_wait: %s", |
|
1098 |
this, should_wait() ? "true" : "false"); |
|
1099 |
} |
|
1100 |
// Release monitor(). |
|
1101 |
} |
|
1102 |
} |
|
1103 |
||
1104 |
Mutex* MonitorSupply::_lock = NULL; |
|
1105 |
GrowableArray<Monitor*>* MonitorSupply::_freelist = NULL; |
|
1106 |
||
1107 |
Monitor* MonitorSupply::reserve() { |
|
1108 |
Monitor* result = NULL; |
|
1109 |
// Lazy initialization: possible race. |
|
1110 |
if (lock() == NULL) { |
|
1111 |
_lock = new Mutex(Mutex::barrier, // rank |
|
1112 |
"MonitorSupply mutex", // name |
|
1113 |
Mutex::_allow_vm_block_flag); // allow_vm_block |
|
1114 |
} |
|
1115 |
{ |
|
1116 |
MutexLockerEx ml(lock()); |
|
1117 |
// Lazy initialization. |
|
1118 |
if (freelist() == NULL) { |
|
1119 |
_freelist = |
|
13195 | 1120 |
new(ResourceObj::C_HEAP, mtGC) GrowableArray<Monitor*>(ParallelGCThreads, |
1 | 1121 |
true); |
1122 |
} |
|
1123 |
if (! freelist()->is_empty()) { |
|
1124 |
result = freelist()->pop(); |
|
1125 |
} else { |
|
1126 |
result = new Monitor(Mutex::barrier, // rank |
|
1127 |
"MonitorSupply monitor", // name |
|
1128 |
Mutex::_allow_vm_block_flag); // allow_vm_block |
|
1129 |
} |
|
1130 |
guarantee(result != NULL, "shouldn't return NULL"); |
|
1131 |
assert(!result->is_locked(), "shouldn't be locked"); |
|
1132 |
// release lock(). |
|
1133 |
} |
|
1134 |
return result; |
|
1135 |
} |
|
1136 |
||
1137 |
void MonitorSupply::release(Monitor* instance) { |
|
1138 |
assert(instance != NULL, "shouldn't release NULL"); |
|
1139 |
assert(!instance->is_locked(), "shouldn't be locked"); |
|
1140 |
{ |
|
1141 |
MutexLockerEx ml(lock()); |
|
1142 |
freelist()->push(instance); |
|
1143 |
// release lock(). |
|
1144 |
} |
|
1145 |
} |