jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSet.cpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.cpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 2011, 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 "gc_implementation/g1/heapRegionRemSet.hpp"
 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 uint FreeRegionList::_unrealistically_long_length = 0;
 void HeapRegionSetBase::fill_in_ext_msg(hrs_ext_msg* msg, const char* message) {
   msg->append("[%s] %s ln: %u cy: "SIZE_FORMAT,
               name(), message, length(), total_capacity_bytes());
   fill_in_ext_msg_extra(msg);
 }
 #ifndef PRODUCT
 void HeapRegionSetBase::verify_region(HeapRegion* hr) {
   assert(hr->containing_set() == this, err_msg("Inconsistent containing set for %u", hr->hrs_index()));
   assert(!hr->is_young(), err_msg("Adding young region %u", hr->hrs_index())); // currently we don't use these sets for young regions
   assert(hr->isHumongous() == regions_humongous(), err_msg("Wrong humongous state for region %u and set %s", hr->hrs_index(), name()));
   assert(hr->is_empty() == regions_empty(), err_msg("Wrong empty state for region %u and set %s", hr->hrs_index(), name()));
   assert(hr->rem_set()->verify_ready_for_par_iteration(), err_msg("Wrong iteration state %u", hr->hrs_index()));
 }
 #endif
 void HeapRegionSetBase::verify() {
   // It's important that we also observe the MT safety protocol even
   // for the verification calls. If we do verification without the
   // appropriate locks and the set changes underneath our feet
   // verification might fail and send us on a wild goose chase.
   check_mt_safety();
   guarantee(( is_empty() && length() == 0 && total_capacity_bytes() == 0) ||
             (!is_empty() && length() >= 0 && total_capacity_bytes() >= 0),
             hrs_ext_msg(this, "invariant"));
 }
 void HeapRegionSetBase::verify_start() {
   // See comment in verify() about MT safety and verification.
   check_mt_safety();
   assert(!_verify_in_progress,
          hrs_ext_msg(this, "verification should not be in progress"));
   // Do the basic verification first before we do the checks over the regions.
   HeapRegionSetBase::verify();
   _verify_in_progress        = true;
 }
 void HeapRegionSetBase::verify_end() {
   // See comment in verify() about MT safety and verification.
   check_mt_safety();
   assert(_verify_in_progress,
          hrs_ext_msg(this, "verification should be in progress"));
   _verify_in_progress = false;
 }
 void HeapRegionSetBase::print_on(outputStream* out, bool print_contents) {
   out->cr();
   out->print_cr("Set: %s ("PTR_FORMAT")", name(), this);
   out->print_cr("  Region Assumptions");
   out->print_cr("    humongous         : %s", BOOL_TO_STR(regions_humongous()));
   out->print_cr("    empty             : %s", BOOL_TO_STR(regions_empty()));
   out->print_cr("  Attributes");
   out->print_cr("    length            : %14u", length());
   out->print_cr("    total capacity    : "SIZE_FORMAT_W(14)" bytes",
                 total_capacity_bytes());
 }
 HeapRegionSetBase::HeapRegionSetBase(const char* name, bool humongous, bool empty, HRSMtSafeChecker* mt_safety_checker)
   : _name(name), _verify_in_progress(false),
     _is_humongous(humongous), _is_empty(empty), _mt_safety_checker(mt_safety_checker),
     _count()
 { }
 void FreeRegionList::set_unrealistically_long_length(uint len) {
   guarantee(_unrealistically_long_length == 0, "should only be set once");
   _unrealistically_long_length = len;
 }
 void FreeRegionList::fill_in_ext_msg_extra(hrs_ext_msg* msg) {
   msg->append(" hd: "PTR_FORMAT" tl: "PTR_FORMAT, head(), tail());
 }
 void FreeRegionList::add_as_head_or_tail(FreeRegionList* from_list, bool as_head) {
   check_mt_safety();
   from_list->check_mt_safety();
   verify_optional();
   from_list->verify_optional();
   if (from_list->is_empty()) {
     return;
   }
 #ifdef ASSERT
   FreeRegionListIterator iter(from_list);
   while (iter.more_available()) {
     HeapRegion* hr = iter.get_next();
     // In set_containing_set() we check that we either set the value
     // from NULL to non-NULL or vice versa to catch bugs. So, we have
     // to NULL it first before setting it to the value.
     hr->set_containing_set(NULL);
     hr->set_containing_set(this);
   }
 #endif // ASSERT
   if (_head == NULL) {
     assert(length() == 0 && _tail == NULL, hrs_ext_msg(this, "invariant"));
     _head = from_list->_head;
     _tail = from_list->_tail;
   } else {
     assert(length() > 0 && _tail != NULL, hrs_ext_msg(this, "invariant"));
     if (as_head) {
       from_list->_tail->set_next(_head);
       _head->set_prev(from_list->_tail);
       _head = from_list->_head;
     } else {
       _tail->set_next(from_list->_head);
       from_list->_head->set_prev(_tail);
       _tail = from_list->_tail;
     }
   }
   _count.increment(from_list->length(), from_list->total_capacity_bytes());
   from_list->clear();
   verify_optional();
   from_list->verify_optional();
 }
 void FreeRegionList::add_as_head(FreeRegionList* from_list) {
   add_as_head_or_tail(from_list, true /* as_head */);
 }
 void FreeRegionList::add_as_tail(FreeRegionList* from_list) {
   add_as_head_or_tail(from_list, false /* as_head */);
 }
 void FreeRegionList::remove_all() {
   check_mt_safety();
   verify_optional();
   HeapRegion* curr = _head;
   while (curr != NULL) {
     verify_region(curr);
     HeapRegion* next = curr->next();
     curr->set_next(NULL);
     curr->set_prev(NULL);
     curr->set_containing_set(NULL);
     curr = next;
   }
   clear();
   verify_optional();
 }
 void FreeRegionList::add_ordered(FreeRegionList* from_list) {
   check_mt_safety();
   from_list->check_mt_safety();
   verify_optional();
   from_list->verify_optional();
   if (from_list->is_empty()) {
     return;
   }
   if (is_empty()) {
     add_as_head(from_list);
     return;
   }
   #ifdef ASSERT
   FreeRegionListIterator iter(from_list);
   while (iter.more_available()) {
     HeapRegion* hr = iter.get_next();
     // In set_containing_set() we check that we either set the value
     // from NULL to non-NULL or vice versa to catch bugs. So, we have
     // to NULL it first before setting it to the value.
     hr->set_containing_set(NULL);
     hr->set_containing_set(this);
   }
   #endif // ASSERT
   HeapRegion* curr_to = _head;
   HeapRegion* curr_from = from_list->_head;
   while (curr_from != NULL) {
     while (curr_to != NULL && curr_to->hrs_index() < curr_from->hrs_index()) {
       curr_to = curr_to->next();
     }
     if (curr_to == NULL) {
       // The rest of the from list should be added as tail
       _tail->set_next(curr_from);
       curr_from->set_prev(_tail);
       curr_from = NULL;
     } else {
       HeapRegion* next_from = curr_from->next();
       curr_from->set_next(curr_to);
       curr_from->set_prev(curr_to->prev());
       if (curr_to->prev() == NULL) {
         _head = curr_from;
       } else {
         curr_to->prev()->set_next(curr_from);
       }
       curr_to->set_prev(curr_from);
       curr_from = next_from;
     }
   }
   if (_tail->hrs_index() < from_list->_tail->hrs_index()) {
     _tail = from_list->_tail;
   }
   _count.increment(from_list->length(), from_list->total_capacity_bytes());
   from_list->clear();
   verify_optional();
   from_list->verify_optional();
 }
 void FreeRegionList::remove_all_pending(uint target_count) {
   check_mt_safety();
   assert(target_count > 1, hrs_ext_msg(this, "pre-condition"));
   assert(!is_empty(), hrs_ext_msg(this, "pre-condition"));
   verify_optional();
   DEBUG_ONLY(uint old_length = length();)
   HeapRegion* curr = _head;
   uint count = 0;
   while (curr != NULL) {
     verify_region(curr);
     HeapRegion* next = curr->next();
     HeapRegion* prev = curr->prev();
     if (curr->pending_removal()) {
       assert(count < target_count,
              hrs_err_msg("[%s] should not come across more regions "
                          "pending for removal than target_count: %u",
                          name(), target_count));
       if (prev == NULL) {
         assert(_head == curr, hrs_ext_msg(this, "invariant"));
         _head = next;
       } else {
         assert(_head != curr, hrs_ext_msg(this, "invariant"));
         prev->set_next(next);
       }
       if (next == NULL) {
         assert(_tail == curr, hrs_ext_msg(this, "invariant"));
         _tail = prev;
       } else {
         assert(_tail != curr, hrs_ext_msg(this, "invariant"));
         next->set_prev(prev);
       }
       if (_last = curr) {
         _last = NULL;
       }
       curr->set_next(NULL);
       curr->set_prev(NULL);
       remove(curr);
       curr->set_pending_removal(false);
       count += 1;
       // If we have come across the target number of regions we can
       // just bail out. However, for debugging purposes, we can just
       // carry on iterating to make sure there are not more regions
       // tagged with pending removal.
       DEBUG_ONLY(if (count == target_count) break;)
     }
     curr = next;
   }
   assert(count == target_count,
          hrs_err_msg("[%s] count: %u should be == target_count: %u",
                      name(), count, target_count));
   assert(length() + target_count == old_length,
          hrs_err_msg("[%s] new length should be consistent "
                      "new length: %u old length: %u target_count: %u",
                      name(), length(), old_length, target_count));
   verify_optional();
 }
 void FreeRegionList::verify() {
   // See comment in HeapRegionSetBase::verify() about MT safety and
   // verification.
   check_mt_safety();
   // This will also do the basic verification too.
   verify_start();
   verify_list();
   verify_end();
 }
 void FreeRegionList::clear() {
   _count = HeapRegionSetCount();
   _head = NULL;
   _tail = NULL;
   _last = NULL;
 }
 void FreeRegionList::print_on(outputStream* out, bool print_contents) {
   HeapRegionSetBase::print_on(out, print_contents);
   out->print_cr("  Linking");
   out->print_cr("    head              : "PTR_FORMAT, _head);
   out->print_cr("    tail              : "PTR_FORMAT, _tail);
   if (print_contents) {
     out->print_cr("  Contents");
     FreeRegionListIterator iter(this);
     while (iter.more_available()) {
       HeapRegion* hr = iter.get_next();
       hr->print_on(out);
     }
   }
 }
 void FreeRegionList::verify_list() {
   HeapRegion* curr = head();
   HeapRegion* prev1 = NULL;
   HeapRegion* prev0 = NULL;
   uint count = 0;
   size_t capacity = 0;
   uint last_index = 0;
   guarantee(_head == NULL || _head->prev() == NULL, "_head should not have a prev");
   while (curr != NULL) {
     verify_region(curr);
     count++;
     guarantee(count < _unrealistically_long_length,
         hrs_err_msg("[%s] the calculated length: %u seems very long, is there maybe a cycle? curr: "PTR_FORMAT" prev0: "PTR_FORMAT" " "prev1: "PTR_FORMAT" length: %u", name(), count, curr, prev0, prev1, length()));
     if (curr->next() != NULL) {
       guarantee(curr->next()->prev() == curr, "Next or prev pointers messed up");
     }
     guarantee(curr->hrs_index() == 0 || curr->hrs_index() > last_index, "List should be sorted");
     last_index = curr->hrs_index();
     capacity += curr->capacity();
     prev1 = prev0;
     prev0 = curr;
     curr = curr->next();
   }
   guarantee(tail() == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), tail()->hrs_index(), prev0->hrs_index()));
   guarantee(_tail == NULL || _tail->next() == NULL, "_tail should not have a next");
   guarantee(length() == count, err_msg("%s count mismatch. Expected %u, actual %u.", name(), length(), count));
   guarantee(total_capacity_bytes() == capacity, err_msg("%s capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT,
       name(), total_capacity_bytes(), capacity));
 }
 // Note on the check_mt_safety() methods below:
 //
 // Verification of the "master" heap region sets / lists that are
 // maintained by G1CollectedHeap is always done during a STW pause and
 // by the VM thread at the start / end of the pause. The standard
 // verification methods all assert check_mt_safety(). This is
 // important as it ensures that verification is done without
 // concurrent updates taking place at the same time. It follows, that,
 // for the "master" heap region sets / lists, the check_mt_safety()
 // method should include the VM thread / STW case.
 void MasterFreeRegionListMtSafeChecker::check() {
   // Master Free List MT safety protocol:
   // (a) If we're at a safepoint, operations on the master free list
   // should be invoked by either the VM thread (which will serialize
   // them) or by the GC workers while holding the
   // FreeList_lock.
   // (b) If we're not at a safepoint, operations on the master free
   // list should be invoked while holding the Heap_lock.
   if (SafepointSynchronize::is_at_safepoint()) {
     guarantee(Thread::current()->is_VM_thread() ||
               FreeList_lock->owned_by_self(), "master free list MT safety protocol at a safepoint");
   } else {
     guarantee(Heap_lock->owned_by_self(), "master free list MT safety protocol outside a safepoint");
   }
 }
 void SecondaryFreeRegionListMtSafeChecker::check() {
   // Secondary Free List MT safety protocol:
   // Operations on the secondary free list should always be invoked
   // while holding the SecondaryFreeList_lock.
   guarantee(SecondaryFreeList_lock->owned_by_self(), "secondary free list MT safety protocol");
 }
 void OldRegionSetMtSafeChecker::check() {
   // Master Old Set MT safety protocol:
   // (a) If we're at a safepoint, operations on the master old set
   // should be invoked:
   // - by the VM thread (which will serialize them), or
   // - by the GC workers while holding the FreeList_lock, if we're
   //   at a safepoint for an evacuation pause (this lock is taken
   //   anyway when an GC alloc region is retired so that a new one
   //   is allocated from the free list), or
   // - by the GC workers while holding the OldSets_lock, if we're at a
   //   safepoint for a cleanup pause.
   // (b) If we're not at a safepoint, operations on the master old set
   // should be invoked while holding the Heap_lock.
   if (SafepointSynchronize::is_at_safepoint()) {
     guarantee(Thread::current()->is_VM_thread()
         || FreeList_lock->owned_by_self() || OldSets_lock->owned_by_self(),
         "master old set MT safety protocol at a safepoint");
   } else {
     guarantee(Heap_lock->owned_by_self(), "master old set MT safety protocol outside a safepoint");
   }
 }
 void HumongousRegionSetMtSafeChecker::check() {
   // Humongous Set MT safety protocol:
   // (a) If we're at a safepoint, operations on the master humongous
   // set should be invoked by either the VM thread (which will
   // serialize them) or by the GC workers while holding the
   // OldSets_lock.
   // (b) If we're not at a safepoint, operations on the master
   // humongous set should be invoked while holding the Heap_lock.
   if (SafepointSynchronize::is_at_safepoint()) {
     guarantee(Thread::current()->is_VM_thread() ||
               OldSets_lock->owned_by_self(),
               "master humongous set MT safety protocol at a safepoint");
   } else {
     guarantee(Heap_lock->owned_by_self(),
               "master humongous set MT safety protocol outside a safepoint");
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/heapRegionSet.cpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.cpp