jdk8-mips64-public/hotspot: src/share/vm/services/memTrackWorker.cpp@69ad7823b1ca (annotated)

src/share/vm/services/memTrackWorker.cpp@69ad7823b1ca (annotated)

src/share/vm/services/memTrackWorker.cpp

Mon, 05 Nov 2012 15:30:22 -0500

author: zgu
date: Mon, 05 Nov 2012 15:30:22 -0500
changeset 4248: 69ad7823b1ca
parent 4053: 33143ee07800
child 4400: ecd24264898b
permissions: -rw-r--r--

8001591: NMT: assertion failed: assert(rec->addr() + rec->size() <= cur->base()) failed: Can not overlap in memSnapshot.cpp
Summary: NMT should allow overlapping committed regions as long as they belong to the same reserved region
Reviewed-by: dholmes, coleenp

 /*
  * 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memTrackWorker.cpp@69ad7823b1ca (annotated)

src/share/vm/services/memTrackWorker.cpp