| /* |
| * Copyright (c) 2012, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "runtime/threadCritical.hpp" |
| #include "services/memTracker.hpp" |
| #include "services/memTrackWorker.hpp" |
| #include "utilities/decoder.hpp" |
| #include "utilities/vmError.hpp" |
| |
| MemTrackWorker::MemTrackWorker() { |
| // create thread uses cgc thread type for now. We should revisit |
| // the option, or create new thread type. |
| _has_error = !os::create_thread(this, os::cgc_thread); |
| set_name("MemTrackWorker", 0); |
| |
| // initial generation circuit buffer |
| if (!has_error()) { |
| _head = _tail = 0; |
| for(int index = 0; index < MAX_GENERATIONS; index ++) { |
| _gen[index] = NULL; |
| } |
| } |
| NOT_PRODUCT(_sync_point_count = 0;) |
| NOT_PRODUCT(_merge_count = 0;) |
| NOT_PRODUCT(_last_gen_in_use = 0;) |
| } |
| |
| MemTrackWorker::~MemTrackWorker() { |
| for (int index = 0; index < MAX_GENERATIONS; index ++) { |
| MemRecorder* rc = _gen[index]; |
| if (rc != NULL) { |
| delete rc; |
| } |
| } |
| } |
| |
| void* MemTrackWorker::operator new(size_t size) { |
| assert(false, "use nothrow version"); |
| return NULL; |
| } |
| |
| void* MemTrackWorker::operator new(size_t size, const std::nothrow_t& nothrow_constant) { |
| return allocate(size, false, mtNMT); |
| } |
| |
| void MemTrackWorker::start() { |
| os::start_thread(this); |
| } |
| |
| /* |
| * Native memory tracking worker thread loop: |
| * 1. merge one generation of memory recorders to staging area |
| * 2. promote staging data to memory snapshot |
| * |
| * This thread can run through safepoint. |
| */ |
| |
| void MemTrackWorker::run() { |
| assert(MemTracker::is_on(), "native memory tracking is off"); |
| this->initialize_thread_local_storage(); |
| this->record_stack_base_and_size(); |
| MemSnapshot* snapshot = MemTracker::get_snapshot(); |
| assert(snapshot != NULL, "Worker should not be started"); |
| MemRecorder* rec; |
| |
| while (!MemTracker::shutdown_in_progress()) { |
| NOT_PRODUCT(_last_gen_in_use = generations_in_use();) |
| { |
| // take a recorder from earliest generation in buffer |
| ThreadCritical tc; |
| rec = _gen[_head]; |
| if (rec != NULL) { |
| _gen[_head] = rec->next(); |
| } |
| assert(count_recorder(_gen[_head]) <= MemRecorder::_instance_count, |
| "infinite loop after dequeue"); |
| } |
| if (rec != NULL) { |
| // merge the recorder into staging area |
| if (!snapshot->merge(rec)) { |
| MemTracker::shutdown(MemTracker::NMT_out_of_memory); |
| } else { |
| NOT_PRODUCT(_merge_count ++;) |
| } |
| MemTracker::release_thread_recorder(rec); |
| } else { |
| // no more recorder to merge, promote staging area |
| // to snapshot |
| if (_head != _tail) { |
| { |
| ThreadCritical tc; |
| if (_gen[_head] != NULL || _head == _tail) { |
| continue; |
| } |
| // done with this generation, increment _head pointer |
| _head = (_head + 1) % MAX_GENERATIONS; |
| } |
| // promote this generation data to snapshot |
| if (!snapshot->promote()) { |
| // failed to promote, means out of memory |
| MemTracker::shutdown(MemTracker::NMT_out_of_memory); |
| } |
| } else { |
| snapshot->wait(1000); |
| ThreadCritical tc; |
| // check if more data arrived |
| if (_gen[_head] == NULL) { |
| _gen[_head] = MemTracker::get_pending_recorders(); |
| } |
| } |
| } |
| } |
| assert(MemTracker::shutdown_in_progress(), "just check"); |
| |
| // transits to final shutdown |
| MemTracker::final_shutdown(); |
| } |
| |
| // at synchronization point, where 'safepoint visible' Java threads are blocked |
| // at a safepoint, and the rest of threads are blocked on ThreadCritical lock. |
| // The caller MemTracker::sync() already takes ThreadCritical before calling this |
| // method. |
| // |
| // Following tasks are performed: |
| // 1. add all recorders in pending queue to current generation |
| // 2. increase generation |
| |
| void MemTrackWorker::at_sync_point(MemRecorder* rec) { |
| NOT_PRODUCT(_sync_point_count ++;) |
| assert(count_recorder(rec) <= MemRecorder::_instance_count, |
| "pending queue has infinite loop"); |
| |
| bool out_of_generation_buffer = false; |
| // check shutdown state inside ThreadCritical |
| if (MemTracker::shutdown_in_progress()) return; |
| // append the recorders to the end of the generation |
| if( rec != NULL) { |
| MemRecorder* cur_head = _gen[_tail]; |
| if (cur_head == NULL) { |
| _gen[_tail] = rec; |
| } else { |
| while (cur_head->next() != NULL) { |
| cur_head = cur_head->next(); |
| } |
| cur_head->set_next(rec); |
| } |
| } |
| assert(count_recorder(rec) <= MemRecorder::_instance_count, |
| "after add to current generation has infinite loop"); |
| // we have collected all recorders for this generation. If there is data, |
| // we need to increment _tail to start a new generation. |
| if (_gen[_tail] != NULL || _head == _tail) { |
| _tail = (_tail + 1) % MAX_GENERATIONS; |
| out_of_generation_buffer = (_tail == _head); |
| } |
| |
| if (out_of_generation_buffer) { |
| MemTracker::shutdown(MemTracker::NMT_out_of_generation); |
| } |
| } |
| |
| #ifndef PRODUCT |
| int MemTrackWorker::count_recorder(const MemRecorder* head) { |
| int count = 0; |
| while(head != NULL) { |
| count ++; |
| head = head->next(); |
| } |
| return count; |
| } |
| |
| int MemTrackWorker::count_pending_recorders() const { |
| int count = 0; |
| for (int index = 0; index < MAX_GENERATIONS; index ++) { |
| MemRecorder* head = _gen[index]; |
| if (head != NULL) { |
| count += count_recorder(head); |
| } |
| } |
| return count; |
| } |
| #endif |