jdk8-mips64-public/hotspot: src/share/vm/services/memTrackWorker.cpp@8f696cf1a0fb (annotated)

src/share/vm/services/memTrackWorker.cpp@8f696cf1a0fb (annotated)

src/share/vm/services/memTrackWorker.cpp

Sun, 03 Feb 2013 22:28:08 +0400

author: dsamersoff
date: Sun, 03 Feb 2013 22:28:08 +0400
changeset 4520: 8f696cf1a0fb
parent 4512: 4102b59539ce
child 4927: 35f8765422b9
permissions: -rw-r--r--

8002048: Protocol to discovery of manageable Java processes on a network
Summary: Introduce a protocol to discover manageble Java instances across a network subnet, JDP
Reviewed-by: sla, dfuchs

 /*
  * 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"
 void GenerationData::reset() {
   _number_of_classes = 0;
   while (_recorder_list != NULL) {
     MemRecorder* tmp = _recorder_list;
     _recorder_list = _recorder_list->next();
     MemTracker::release_thread_recorder(tmp);
   }
 }
 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 ++) {
       ::new ((void*)&_gen[index]) GenerationData();
     }
   }
   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 ++) {
     _gen[index].reset();
   }
 }
 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;
   unsigned long processing_generation = 0;
   bool          worker_idle = false;
   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].next_recorder();
     }
     if (rec != NULL) {
       if (rec->get_generation() != processing_generation || worker_idle) {
         processing_generation = rec->get_generation();
         worker_idle = false;
         MemTracker::set_current_processing_generation(processing_generation);
       }
       // 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) {
         long number_of_classes;
         {
           ThreadCritical tc;
           if (_gen[_head].has_more_recorder() || _head == _tail) {
             continue;
           }
           number_of_classes = _gen[_head].number_of_classes();
           _gen[_head].reset();
           // done with this generation, increment _head pointer
           _head = (_head + 1) % MAX_GENERATIONS;
         }
         // promote this generation data to snapshot
         if (!snapshot->promote(number_of_classes)) {
           // failed to promote, means out of memory
           MemTracker::shutdown(MemTracker::NMT_out_of_memory);
         }
       } else {
         // worker thread is idle
         worker_idle = true;
         MemTracker::report_worker_idle();
         snapshot->wait(1000);
         ThreadCritical tc;
         // check if more data arrived
         if (!_gen[_head].has_more_recorder()) {
           _gen[_head].add_recorders(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, int number_of_classes) {
   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;
   _gen[_tail].set_number_of_classes(number_of_classes);
   // append the recorders to the end of the generation
   _gen[_tail].add_recorders(rec);
   assert(count_recorder(_gen[_tail].peek()) <= 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].has_more_recorder()  || _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].peek();
     if (head != NULL) {
       count += count_recorder(head);
     }
   }
   return count;
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memTrackWorker.cpp@8f696cf1a0fb (annotated)

src/share/vm/services/memTrackWorker.cpp