jdk8-mips64-public/hotspot: src/share/vm/services/memSnapshot.cpp@710a3c8b516e (annotated)

src/share/vm/services/memSnapshot.cpp@710a3c8b516e (annotated)

src/share/vm/services/memSnapshot.cpp

Tue, 08 Aug 2017 15:57:29 +0800

author: aoqi
date: Tue, 08 Aug 2017 15:57:29 +0800
changeset 6876: 710a3c8b516e
parent 6680: 78bbf4d43a14
parent 0: f90c822e73f8
permissions: -rw-r--r--

merge

 /*
  * Copyright (c) 2012, 2014, 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/mutexLocker.hpp"
 #include "utilities/decoder.hpp"
 #include "services/memBaseline.hpp"
 #include "services/memPtr.hpp"
 #include "services/memPtrArray.hpp"
 #include "services/memSnapshot.hpp"
 #include "services/memTracker.hpp"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 #ifdef ASSERT
 void decode_pointer_record(MemPointerRecord* rec) {
   tty->print("Pointer: [" PTR_FORMAT " - " PTR_FORMAT  "] size = %d bytes", rec->addr(),
     rec->addr() + rec->size(), (int)rec->size());
   tty->print(" type = %s", MemBaseline::type2name(FLAGS_TO_MEMORY_TYPE(rec->flags())));
   if (rec->is_vm_pointer()) {
     if (rec->is_allocation_record()) {
       tty->print_cr(" (reserve)");
     } else if (rec->is_commit_record()) {
       tty->print_cr(" (commit)");
     } else if (rec->is_uncommit_record()) {
       tty->print_cr(" (uncommit)");
     } else if (rec->is_deallocation_record()) {
       tty->print_cr(" (release)");
     } else {
       tty->print_cr(" (tag)");
     }
   } else {
     if (rec->is_arena_memory_record()) {
       tty->print_cr(" (arena size)");
     } else if (rec->is_allocation_record()) {
       tty->print_cr(" (malloc)");
     } else {
       tty->print_cr(" (free)");
     }
   }
   if (MemTracker::track_callsite()) {
     char buf[1024];
     address pc = ((MemPointerRecordEx*)rec)->pc();
     if (pc != NULL && os::dll_address_to_function_name(pc, buf, sizeof(buf), NULL)) {
       tty->print_cr("\tfrom %s", buf);
     } else {
       tty->print_cr("\tcould not decode pc = " PTR_FORMAT "", pc);
     }
   }
 }
 void decode_vm_region_record(VMMemRegion* rec) {
   tty->print("VM Region [" PTR_FORMAT " - " PTR_FORMAT "]", rec->addr(),
     rec->addr() + rec->size());
   tty->print(" type = %s", MemBaseline::type2name(FLAGS_TO_MEMORY_TYPE(rec->flags())));
   if (rec->is_allocation_record()) {
     tty->print_cr(" (reserved)");
   } else if (rec->is_commit_record()) {
     tty->print_cr(" (committed)");
   } else {
     ShouldNotReachHere();
   }
   if (MemTracker::track_callsite()) {
     char buf[1024];
     address pc = ((VMMemRegionEx*)rec)->pc();
     if (pc != NULL && os::dll_address_to_function_name(pc, buf, sizeof(buf), NULL)) {
       tty->print_cr("\tfrom %s", buf);
     } else {
       tty->print_cr("\tcould not decode pc = " PTR_FORMAT "", pc);
     }
   }
 }
 #endif
 bool VMMemPointerIterator::insert_record(MemPointerRecord* rec) {
   VMMemRegionEx new_rec;
   assert(rec->is_allocation_record() || rec->is_commit_record(),
     "Sanity check");
   if (MemTracker::track_callsite()) {
     new_rec.init((MemPointerRecordEx*)rec);
   } else {
     new_rec.init(rec);
   }
   return insert(&new_rec);
 }
 bool VMMemPointerIterator::insert_record_after(MemPointerRecord* rec) {
   VMMemRegionEx new_rec;
   assert(rec->is_allocation_record() || rec->is_commit_record(),
     "Sanity check");
   if (MemTracker::track_callsite()) {
     new_rec.init((MemPointerRecordEx*)rec);
   } else {
     new_rec.init(rec);
   }
   return insert_after(&new_rec);
 }
 // we don't consolidate reserved regions, since they may be categorized
 // in different types.
 bool VMMemPointerIterator::add_reserved_region(MemPointerRecord* rec) {
   assert(rec->is_allocation_record(), "Sanity check");
   VMMemRegion* reserved_region = (VMMemRegion*)current();
   // we don't have anything yet
   if (reserved_region == NULL) {
     return insert_record(rec);
   }
   assert(reserved_region->is_reserved_region(), "Sanity check");
   // duplicated records
   if (reserved_region->is_same_region(rec)) {
     return true;
   }
   // Overlapping stack regions indicate that a JNI thread failed to
   // detach from the VM before exiting. This leaks the JavaThread object.
   if (CheckJNICalls)  {
       guarantee(FLAGS_TO_MEMORY_TYPE(reserved_region->flags()) != mtThreadStack ||
          !reserved_region->overlaps_region(rec),
          "Attached JNI thread exited without being detached");
   }
   // otherwise, we should not have overlapping reserved regions
   assert(FLAGS_TO_MEMORY_TYPE(reserved_region->flags()) == mtThreadStack ||
     reserved_region->base() > rec->addr(), "Just check: locate()");
   assert(FLAGS_TO_MEMORY_TYPE(reserved_region->flags()) == mtThreadStack ||
     !reserved_region->overlaps_region(rec), "overlapping reserved regions");
   return insert_record(rec);
 }
 // we do consolidate committed regions
 bool VMMemPointerIterator::add_committed_region(MemPointerRecord* rec) {
   assert(rec->is_commit_record(), "Sanity check");
   VMMemRegion* reserved_rgn = (VMMemRegion*)current();
   assert(reserved_rgn->is_reserved_region() && reserved_rgn->contains_region(rec),
     "Sanity check");
   // thread's native stack is always marked as "committed", ignore
   // the "commit" operation for creating stack guard pages
   if (FLAGS_TO_MEMORY_TYPE(reserved_rgn->flags()) == mtThreadStack &&
       FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
     return true;
   }
   // if the reserved region has any committed regions
   VMMemRegion* committed_rgn  = (VMMemRegion*)next();
   while (committed_rgn != NULL && committed_rgn->is_committed_region()) {
     // duplicated commit records
     if(committed_rgn->contains_region(rec)) {
       return true;
     } else if (committed_rgn->overlaps_region(rec)) {
       // overlaps front part
       if (rec->addr() < committed_rgn->addr()) {
         committed_rgn->expand_region(rec->addr(),
           committed_rgn->addr() - rec->addr());
       } else {
         // overlaps tail part
         address committed_rgn_end = committed_rgn->addr() +
               committed_rgn->size();
         assert(committed_rgn_end < rec->addr() + rec->size(),
              "overlap tail part");
         committed_rgn->expand_region(committed_rgn_end,
           (rec->addr() + rec->size()) - committed_rgn_end);
       }
     } else if (committed_rgn->base() + committed_rgn->size() == rec->addr()) {
       // adjunct each other
       committed_rgn->expand_region(rec->addr(), rec->size());
       VMMemRegion* next_reg = (VMMemRegion*)next();
       // see if we can consolidate next committed region
       if (next_reg != NULL && next_reg->is_committed_region() &&
         next_reg->base() == committed_rgn->base() + committed_rgn->size()) {
           committed_rgn->expand_region(next_reg->base(), next_reg->size());
           // delete merged region
           remove();
       }
       return true;
     } else if (committed_rgn->base() > rec->addr()) {
       // found the location, insert this committed region
       return insert_record(rec);
     }
     committed_rgn = (VMMemRegion*)next();
   }
   return insert_record(rec);
 }
 bool VMMemPointerIterator::remove_uncommitted_region(MemPointerRecord* rec) {
   assert(rec->is_uncommit_record(), "sanity check");
   VMMemRegion* cur;
   cur = (VMMemRegion*)current();
   assert(cur->is_reserved_region() && cur->contains_region(rec),
     "Sanity check");
   // thread's native stack is always marked as "committed", ignore
   // the "commit" operation for creating stack guard pages
   if (FLAGS_TO_MEMORY_TYPE(cur->flags()) == mtThreadStack &&
       FLAGS_TO_MEMORY_TYPE(rec->flags()) != mtThreadStack) {
     return true;
   }
   cur = (VMMemRegion*)next();
   while (cur != NULL && cur->is_committed_region()) {
     // region already uncommitted, must be due to duplicated record
     if (cur->addr() >= rec->addr() + rec->size()) {
       break;
     } else if (cur->contains_region(rec)) {
       // uncommit whole region
       if (cur->is_same_region(rec)) {
         remove();
         break;
       } else if (rec->addr() == cur->addr() ||
         rec->addr() + rec->size() == cur->addr() + cur->size()) {
         // uncommitted from either end of current memory region.
         cur->exclude_region(rec->addr(), rec->size());
         break;
       } else { // split the committed region and release the middle
         address high_addr = cur->addr() + cur->size();
         size_t sz = high_addr - rec->addr();
         cur->exclude_region(rec->addr(), sz);
         sz = high_addr - (rec->addr() + rec->size());
         if (MemTracker::track_callsite()) {
           MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
              ((VMMemRegionEx*)cur)->pc());
           return insert_record_after(&tmp);
         } else {
           MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
           return insert_record_after(&tmp);
         }
       }
     }
     cur = (VMMemRegion*)next();
   }
   // we may not find committed record due to duplicated records
   return true;
 }
 bool VMMemPointerIterator::remove_released_region(MemPointerRecord* rec) {
   assert(rec->is_deallocation_record(), "Sanity check");
   VMMemRegion* cur = (VMMemRegion*)current();
   assert(cur->is_reserved_region() && cur->contains_region(rec),
     "Sanity check");
   if (rec->is_same_region(cur)) {
     // In snapshot, the virtual memory records are sorted in following orders:
     // 1. virtual memory's base address
     // 2. virtual memory reservation record, followed by commit records within this reservation.
     //    The commit records are also in base address order.
     // When a reserved region is released, we want to remove the reservation record and all
     // commit records following it.
 #ifdef ASSERT
     address low_addr = cur->addr();
     address high_addr = low_addr + cur->size();
 #endif
     // remove virtual memory reservation record
     remove();
     // remove committed regions within above reservation
     VMMemRegion* next_region = (VMMemRegion*)current();
     while (next_region != NULL && next_region->is_committed_region()) {
       assert(next_region->addr() >= low_addr &&
              next_region->addr() + next_region->size() <= high_addr,
             "Range check");
       remove();
       next_region = (VMMemRegion*)current();
     }
   } else if (rec->addr() == cur->addr() ||
     rec->addr() + rec->size() == cur->addr() + cur->size()) {
     // released region is at either end of this region
     cur->exclude_region(rec->addr(), rec->size());
     assert(check_reserved_region(), "Integrity check");
   } else { // split the reserved region and release the middle
     address high_addr = cur->addr() + cur->size();
     size_t sz = high_addr - rec->addr();
     cur->exclude_region(rec->addr(), sz);
     sz = high_addr - rec->addr() - rec->size();
     if (MemTracker::track_callsite()) {
       MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
         ((VMMemRegionEx*)cur)->pc());
       bool ret = insert_reserved_region(&tmp);
       assert(!ret || check_reserved_region(), "Integrity check");
       return ret;
     } else {
       MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
       bool ret = insert_reserved_region(&tmp);
       assert(!ret || check_reserved_region(), "Integrity check");
       return ret;
     }
   }
   return true;
 }
 bool VMMemPointerIterator::insert_reserved_region(MemPointerRecord* rec) {
   // skip all 'commit' records associated with previous reserved region
   VMMemRegion* p = (VMMemRegion*)next();
   while (p != NULL && p->is_committed_region() &&
          p->base() + p->size() < rec->addr()) {
     p = (VMMemRegion*)next();
   }
   return insert_record(rec);
 }
 bool VMMemPointerIterator::split_reserved_region(VMMemRegion* rgn, address new_rgn_addr, size_t new_rgn_size) {
   assert(rgn->contains_region(new_rgn_addr, new_rgn_size), "Not fully contained");
   address pc = (MemTracker::track_callsite() ? ((VMMemRegionEx*)rgn)->pc() : NULL);
   if (rgn->base() == new_rgn_addr) { // new region is at the beginning of the region
     size_t sz = rgn->size() - new_rgn_size;
     // the original region becomes 'new' region
     rgn->exclude_region(new_rgn_addr + new_rgn_size, sz);
      // remaining becomes next region
     MemPointerRecordEx next_rgn(new_rgn_addr + new_rgn_size, rgn->flags(), sz, pc);
     return insert_reserved_region(&next_rgn);
   } else if (rgn->base() + rgn->size() == new_rgn_addr + new_rgn_size) {
     rgn->exclude_region(new_rgn_addr, new_rgn_size);
     MemPointerRecordEx next_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
     return insert_reserved_region(&next_rgn);
   } else {
     // the orginal region will be split into three
     address rgn_high_addr = rgn->base() + rgn->size();
     // first region
     rgn->exclude_region(new_rgn_addr, (rgn_high_addr - new_rgn_addr));
     // the second region is the new region
     MemPointerRecordEx new_rgn(new_rgn_addr, rgn->flags(), new_rgn_size, pc);
     if (!insert_reserved_region(&new_rgn)) return false;
     // the remaining region
     MemPointerRecordEx rem_rgn(new_rgn_addr + new_rgn_size, rgn->flags(),
       rgn_high_addr - (new_rgn_addr + new_rgn_size), pc);
     return insert_reserved_region(&rem_rgn);
   }
 }
 static int sort_in_seq_order(const void* p1, const void* p2) {
   assert(p1 != NULL && p2 != NULL, "Sanity check");
   const MemPointerRecord* mp1 = (MemPointerRecord*)p1;
   const MemPointerRecord* mp2 = (MemPointerRecord*)p2;
   return (mp1->seq() - mp2->seq());
 }
 bool StagingArea::init() {
   if (MemTracker::track_callsite()) {
     _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>();
     _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecordEx>();
   } else {
     _malloc_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>();
     _vm_data = new (std::nothrow)MemPointerArrayImpl<SeqMemPointerRecord>();
   }
   if (_malloc_data != NULL && _vm_data != NULL &&
       !_malloc_data->out_of_memory() &&
       !_vm_data->out_of_memory()) {
     return true;
   } else {
     if (_malloc_data != NULL) delete _malloc_data;
     if (_vm_data != NULL) delete _vm_data;
     _malloc_data = NULL;
     _vm_data = NULL;
     return false;
   }
 }
 VMRecordIterator StagingArea::virtual_memory_record_walker() {
   MemPointerArray* arr = vm_data();
   // sort into seq number order
   arr->sort((FN_SORT)sort_in_seq_order);
   return VMRecordIterator(arr);
 }
 MemSnapshot::MemSnapshot() {
   if (MemTracker::track_callsite()) {
     _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecordEx>();
     _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegionEx>(64, true);
   } else {
     _alloc_ptrs = new (std::nothrow) MemPointerArrayImpl<MemPointerRecord>();
     _vm_ptrs = new (std::nothrow)MemPointerArrayImpl<VMMemRegion>(64, true);
   }
   _staging_area.init();
   _lock = new (std::nothrow) Mutex(Monitor::max_nonleaf - 1, "memSnapshotLock");
   NOT_PRODUCT(_untracked_count = 0;)
   _number_of_classes = 0;
 }
 MemSnapshot::~MemSnapshot() {
   assert(MemTracker::shutdown_in_progress(), "native memory tracking still on");
   {
     MutexLockerEx locker(_lock);
     if (_alloc_ptrs != NULL) {
       delete _alloc_ptrs;
       _alloc_ptrs = NULL;
     }
     if (_vm_ptrs != NULL) {
       delete _vm_ptrs;
       _vm_ptrs = NULL;
     }
   }
   if (_lock != NULL) {
     delete _lock;
     _lock = NULL;
   }
 }
 void MemSnapshot::copy_seq_pointer(MemPointerRecord* dest, const MemPointerRecord* src) {
   assert(dest != NULL && src != NULL, "Just check");
   assert(dest->addr() == src->addr(), "Just check");
   assert(dest->seq() > 0 && src->seq() > 0, "not sequenced");
   if (MemTracker::track_callsite()) {
     *(SeqMemPointerRecordEx*)dest = *(SeqMemPointerRecordEx*)src;
   } else {
     *(SeqMemPointerRecord*)dest = *(SeqMemPointerRecord*)src;
   }
 }
 void MemSnapshot::assign_pointer(MemPointerRecord*dest, const MemPointerRecord* src) {
   assert(src != NULL && dest != NULL, "Just check");
   assert(dest->seq() == 0 && src->seq() >0, "cast away sequence");
   if (MemTracker::track_callsite()) {
     *(MemPointerRecordEx*)dest = *(MemPointerRecordEx*)src;
   } else {
     *(MemPointerRecord*)dest = *(MemPointerRecord*)src;
   }
 }
 // merge a recorder to the staging area
 bool MemSnapshot::merge(MemRecorder* rec) {
   assert(rec != NULL && !rec->out_of_memory(), "Just check");
   SequencedRecordIterator itr(rec->pointer_itr());
   MutexLockerEx lock(_lock, true);
   MemPointerIterator malloc_staging_itr(_staging_area.malloc_data());
   MemPointerRecord* incoming_rec = (MemPointerRecord*) itr.current();
   MemPointerRecord* matched_rec;
   while (incoming_rec != NULL) {
     if (incoming_rec->is_vm_pointer()) {
       // we don't do anything with virtual memory records during merge
       if (!_staging_area.vm_data()->append(incoming_rec)) {
         return false;
       }
     } else {
       // locate matched record and/or also position the iterator to proper
       // location for this incoming record.
       matched_rec = (MemPointerRecord*)malloc_staging_itr.locate(incoming_rec->addr());
       // we have not seen this memory block in this generation,
       // so just add to staging area
       if (matched_rec == NULL) {
         if (!malloc_staging_itr.insert(incoming_rec)) {
           return false;
         }
       } else if (incoming_rec->addr() == matched_rec->addr()) {
         // whoever has higher sequence number wins
         if (incoming_rec->seq() > matched_rec->seq()) {
           copy_seq_pointer(matched_rec, incoming_rec);
         }
       } else if (incoming_rec->addr() < matched_rec->addr()) {
         if (!malloc_staging_itr.insert(incoming_rec)) {
           return false;
         }
       } else {
         ShouldNotReachHere();
       }
     }
     incoming_rec = (MemPointerRecord*)itr.next();
   }
   NOT_PRODUCT(void check_staging_data();)
   return true;
 }
 // promote data to next generation
 bool MemSnapshot::promote(int number_of_classes) {
   assert(_alloc_ptrs != NULL && _vm_ptrs != NULL, "Just check");
   assert(_staging_area.malloc_data() != NULL && _staging_area.vm_data() != NULL,
          "Just check");
   MutexLockerEx lock(_lock, true);
   MallocRecordIterator  malloc_itr = _staging_area.malloc_record_walker();
   bool promoted = false;
   if (promote_malloc_records(&malloc_itr)) {
     VMRecordIterator vm_itr = _staging_area.virtual_memory_record_walker();
     if (promote_virtual_memory_records(&vm_itr)) {
       promoted = true;
     }
   }
   NOT_PRODUCT(check_malloc_pointers();)
   _staging_area.clear();
   _number_of_classes = number_of_classes;
   return promoted;
 }
 bool MemSnapshot::promote_malloc_records(MemPointerArrayIterator* itr) {
   MemPointerIterator malloc_snapshot_itr(_alloc_ptrs);
   MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
   MemPointerRecord* matched_rec;
   while (new_rec != NULL) {
     matched_rec = (MemPointerRecord*)malloc_snapshot_itr.locate(new_rec->addr());
     // found matched memory block
     if (matched_rec != NULL && new_rec->addr() == matched_rec->addr()) {
       // snapshot already contains 'live' records
       assert(matched_rec->is_allocation_record() || matched_rec->is_arena_memory_record(),
              "Sanity check");
       // update block states
       if (new_rec->is_allocation_record()) {
         assign_pointer(matched_rec, new_rec);
       } else if (new_rec->is_arena_memory_record()) {
         if (new_rec->size() == 0) {
           // remove size record once size drops to 0
           malloc_snapshot_itr.remove();
         } else {
           assign_pointer(matched_rec, new_rec);
         }
       } else {
         // a deallocation record
         assert(new_rec->is_deallocation_record(), "Sanity check");
         // an arena record can be followed by a size record, we need to remove both
         if (matched_rec->is_arena_record()) {
           MemPointerRecord* next = (MemPointerRecord*)malloc_snapshot_itr.peek_next();
           if (next != NULL && next->is_arena_memory_record() &&
               next->is_memory_record_of_arena(matched_rec)) {
             malloc_snapshot_itr.remove();
           }
         }
         // the memory is deallocated, remove related record(s)
         malloc_snapshot_itr.remove();
       }
     } else {
       // don't insert size 0 record
       if (new_rec->is_arena_memory_record() && new_rec->size() == 0) {
         new_rec = NULL;
       }
       if (new_rec != NULL) {
         if  (new_rec->is_allocation_record() || new_rec->is_arena_memory_record()) {
           if (matched_rec != NULL && new_rec->addr() > matched_rec->addr()) {
             if (!malloc_snapshot_itr.insert_after(new_rec)) {
               return false;
             }
           } else {
             if (!malloc_snapshot_itr.insert(new_rec)) {
               return false;
             }
           }
         }
 #ifndef PRODUCT
         else if (!has_allocation_record(new_rec->addr())) {
           // NMT can not track some startup memory, which is allocated before NMT is on
           _untracked_count ++;
         }
 #endif
       }
     }
     new_rec = (MemPointerRecord*)itr->next();
   }
   return true;
 }
 bool MemSnapshot::promote_virtual_memory_records(MemPointerArrayIterator* itr) {
   VMMemPointerIterator vm_snapshot_itr(_vm_ptrs);
   MemPointerRecord* new_rec = (MemPointerRecord*)itr->current();
   VMMemRegion*  reserved_rec;
   while (new_rec != NULL) {
     assert(new_rec->is_vm_pointer(), "Sanity check");
     // locate a reserved region that contains the specified address, or
     // the nearest reserved region has base address just above the specified
     // address
     reserved_rec = (VMMemRegion*)vm_snapshot_itr.locate(new_rec->addr());
     if (reserved_rec != NULL && reserved_rec->contains_region(new_rec)) {
       // snapshot can only have 'live' records
       assert(reserved_rec->is_reserved_region(), "Sanity check");
       if (new_rec->is_allocation_record()) {
         if (!reserved_rec->is_same_region(new_rec)) {
           // only deal with split a bigger reserved region into smaller regions.
           // So far, CDS is the only use case.
           if (!vm_snapshot_itr.split_reserved_region(reserved_rec, new_rec->addr(), new_rec->size())) {
             return false;
           }
         }
       } else if (new_rec->is_uncommit_record()) {
         if (!vm_snapshot_itr.remove_uncommitted_region(new_rec)) {
           return false;
         }
       } else if (new_rec->is_commit_record()) {
         // insert or expand existing committed region to cover this
         // newly committed region
         if (!vm_snapshot_itr.add_committed_region(new_rec)) {
           return false;
         }
       } else if (new_rec->is_deallocation_record()) {
         // release part or all memory region
         if (!vm_snapshot_itr.remove_released_region(new_rec)) {
           return false;
         }
       } else if (new_rec->is_type_tagging_record()) {
         // tag this reserved virtual memory range to a memory type. Can not re-tag a memory range
         // to different type.
         assert(FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == mtNone ||
                FLAGS_TO_MEMORY_TYPE(reserved_rec->flags()) == FLAGS_TO_MEMORY_TYPE(new_rec->flags()),
                "Sanity check");
         reserved_rec->tag(new_rec->flags());
     } else {
         ShouldNotReachHere();
           }
         } else {
       /*
        * The assertion failure indicates mis-matched virtual memory records. The likely
        * scenario is, that some virtual memory operations are not going through os::xxxx_memory()
        * api, which have to be tracked manually. (perfMemory is an example).
       */
       assert(new_rec->is_allocation_record(), "Sanity check");
       if (!vm_snapshot_itr.add_reserved_region(new_rec)) {
             return false;
           }
   }
     new_rec = (MemPointerRecord*)itr->next();
   }
   return true;
 }
 #ifndef PRODUCT
 void MemSnapshot::print_snapshot_stats(outputStream* st) {
   st->print_cr("Snapshot:");
   st->print_cr("\tMalloced: %d/%d [%5.2f%%]  %dKB", _alloc_ptrs->length(), _alloc_ptrs->capacity(),
     (100.0 * (float)_alloc_ptrs->length()) / (float)_alloc_ptrs->capacity(), _alloc_ptrs->instance_size()/K);
   st->print_cr("\tVM: %d/%d [%5.2f%%] %dKB", _vm_ptrs->length(), _vm_ptrs->capacity(),
     (100.0 * (float)_vm_ptrs->length()) / (float)_vm_ptrs->capacity(), _vm_ptrs->instance_size()/K);
   st->print_cr("\tMalloc staging Area:     %d/%d [%5.2f%%] %dKB", _staging_area.malloc_data()->length(),
     _staging_area.malloc_data()->capacity(),
     (100.0 * (float)_staging_area.malloc_data()->length()) / (float)_staging_area.malloc_data()->capacity(),
     _staging_area.malloc_data()->instance_size()/K);
   st->print_cr("\tVirtual memory staging Area:     %d/%d [%5.2f%%] %dKB", _staging_area.vm_data()->length(),
     _staging_area.vm_data()->capacity(),
     (100.0 * (float)_staging_area.vm_data()->length()) / (float)_staging_area.vm_data()->capacity(),
     _staging_area.vm_data()->instance_size()/K);
   st->print_cr("\tUntracked allocation: %d", _untracked_count);
 }
 void MemSnapshot::check_malloc_pointers() {
   MemPointerArrayIteratorImpl mItr(_alloc_ptrs);
   MemPointerRecord* p = (MemPointerRecord*)mItr.current();
   MemPointerRecord* prev = NULL;
   while (p != NULL) {
     if (prev != NULL) {
       assert(p->addr() >= prev->addr(), "sorting order");
     }
     prev = p;
     p = (MemPointerRecord*)mItr.next();
   }
 }
 bool MemSnapshot::has_allocation_record(address addr) {
   MemPointerArrayIteratorImpl itr(_staging_area.malloc_data());
   MemPointerRecord* cur = (MemPointerRecord*)itr.current();
   while (cur != NULL) {
     if (cur->addr() == addr && cur->is_allocation_record()) {
       return true;
     }
     cur = (MemPointerRecord*)itr.next();
   }
   return false;
 }
 #endif // PRODUCT
 #ifdef ASSERT
 void MemSnapshot::check_staging_data() {
   MemPointerArrayIteratorImpl itr(_staging_area.malloc_data());
   MemPointerRecord* cur = (MemPointerRecord*)itr.current();
   MemPointerRecord* next = (MemPointerRecord*)itr.next();
   while (next != NULL) {
     assert((next->addr() > cur->addr()) ||
       ((next->flags() & MemPointerRecord::tag_masks) >
        (cur->flags() & MemPointerRecord::tag_masks)),
        "sorting order");
     cur = next;
     next = (MemPointerRecord*)itr.next();
   }
   MemPointerArrayIteratorImpl vm_itr(_staging_area.vm_data());
   cur = (MemPointerRecord*)vm_itr.current();
   while (cur != NULL) {
     assert(cur->is_vm_pointer(), "virtual memory pointer only");
     cur = (MemPointerRecord*)vm_itr.next();
   }
 }
 void MemSnapshot::dump_all_vm_pointers() {
   MemPointerArrayIteratorImpl itr(_vm_ptrs);
   VMMemRegion* ptr = (VMMemRegion*)itr.current();
   tty->print_cr("dump virtual memory pointers:");
   while (ptr != NULL) {
     if (ptr->is_committed_region()) {
       tty->print("\t");
     }
     tty->print("[" PTR_FORMAT " - " PTR_FORMAT "] [%x]", ptr->addr(),
       (ptr->addr() + ptr->size()), ptr->flags());
     if (MemTracker::track_callsite()) {
       VMMemRegionEx* ex = (VMMemRegionEx*)ptr;
       if (ex->pc() != NULL) {
         char buf[1024];
         if (os::dll_address_to_function_name(ex->pc(), buf, sizeof(buf), NULL)) {
           tty->print_cr("\t%s", buf);
         } else {
           tty->cr();
         }
       }
     }
     ptr = (VMMemRegion*)itr.next();
   }
   tty->flush();
 }
 #endif // ASSERT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/services/memSnapshot.cpp@710a3c8b516e (annotated)

src/share/vm/services/memSnapshot.cpp