jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp

Thu, 23 Oct 2014 12:02:08 -0700

author: asaha
date: Thu, 23 Oct 2014 12:02:08 -0700
changeset 7476: c2844108a708
parent 7257: e7d0505c8a30
child 7509: ae52ee069062
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2001, 2013, 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/g1BiasedArray.hpp"
 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
 #include "memory/allocation.inline.hpp"
 #include "runtime/virtualspace.hpp"
 #include "services/memTracker.hpp"
 #include "utilities/bitMap.inline.hpp"
 G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs,
                                              size_t commit_granularity,
                                              size_t region_granularity,
                                              MemoryType type) :
   _storage(),
   _commit_granularity(commit_granularity),
   _region_granularity(region_granularity),
   _listener(NULL),
   _commit_map() {
   guarantee(is_power_of_2(commit_granularity), "must be");
   guarantee(is_power_of_2(region_granularity), "must be");
   _storage.initialize_with_granularity(rs, commit_granularity);
   MemTracker::record_virtual_memory_type((address)rs.base(), type);
 }
 // G1RegionToSpaceMapper implementation where the region granularity is larger than
 // or the same as the commit granularity.
 // Basically, the space corresponding to one region region spans several OS pages.
 class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper {
  private:
   size_t _pages_per_region;
  public:
   G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs,
                                       size_t os_commit_granularity,
                                       size_t alloc_granularity,
                                       size_t commit_factor,
                                       MemoryType type) :
      G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
     _pages_per_region(alloc_granularity / (os_commit_granularity * commit_factor)) {
     guarantee(alloc_granularity >= os_commit_granularity, "allocation granularity smaller than commit granularity");
     _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
   }
   virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
     _storage.commit(start_idx * _pages_per_region, num_regions * _pages_per_region);
     _commit_map.set_range(start_idx, start_idx + num_regions);
     fire_on_commit(start_idx, num_regions, true);
   }
   virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
     _storage.uncommit(start_idx * _pages_per_region, num_regions * _pages_per_region);
     _commit_map.clear_range(start_idx, start_idx + num_regions);
   }
 };
 // G1RegionToSpaceMapper implementation where the region granularity is smaller
 // than the commit granularity.
 // Basically, the contents of one OS page span several regions.
 class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper {
  private:
   class CommitRefcountArray : public G1BiasedMappedArray<uint> {
    protected:
      virtual uint default_value() const { return 0; }
   };
   size_t _regions_per_page;
   CommitRefcountArray _refcounts;
   uintptr_t region_idx_to_page_idx(uint region) const {
     return region / _regions_per_page;
   }
  public:
   G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs,
                                        size_t os_commit_granularity,
                                        size_t alloc_granularity,
                                        size_t commit_factor,
                                        MemoryType type) :
      G1RegionToSpaceMapper(rs, os_commit_granularity, alloc_granularity, type),
     _regions_per_page((os_commit_granularity * commit_factor) / alloc_granularity), _refcounts() {
     guarantee((os_commit_granularity * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity");
     _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + rs.size()), os_commit_granularity);
     _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false);
   }
   virtual void commit_regions(uintptr_t start_idx, size_t num_regions) {
     for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
       assert(!_commit_map.at(i), err_msg("Trying to commit storage at region "INTPTR_FORMAT" that is already committed", i));
       uintptr_t idx = region_idx_to_page_idx(i);
       uint old_refcount = _refcounts.get_by_index(idx);
       bool zero_filled = false;
       if (old_refcount == 0) {
         _storage.commit(idx, 1);
         zero_filled = true;
       }
       _refcounts.set_by_index(idx, old_refcount + 1);
       _commit_map.set_bit(i);
       fire_on_commit(i, 1, zero_filled);
     }
   }
   virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions) {
     for (uintptr_t i = start_idx; i < start_idx + num_regions; i++) {
       assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region "INTPTR_FORMAT" that is not committed", i));
       uintptr_t idx = region_idx_to_page_idx(i);
       uint old_refcount = _refcounts.get_by_index(idx);
       assert(old_refcount > 0, "must be");
       if (old_refcount == 1) {
         _storage.uncommit(idx, 1);
       }
       _refcounts.set_by_index(idx, old_refcount - 1);
       _commit_map.clear_bit(i);
     }
   }
 };
 void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) {
   if (_listener != NULL) {
     _listener->on_commit(start_idx, num_regions, zero_filled);
   }
 }
 G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs,
                                                             size_t os_commit_granularity,
                                                             size_t region_granularity,
                                                             size_t commit_factor,
                                                             MemoryType type) {
   if (region_granularity >= (os_commit_granularity * commit_factor)) {
     return new G1RegionsLargerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
   } else {
     return new G1RegionsSmallerThanCommitSizeMapper(rs, os_commit_granularity, region_granularity, commit_factor, type);
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.cpp