author | stefank |
Thu, 01 Sep 2011 16:18:17 +0200 | |
changeset 10524 | 6594ca81279a |
parent 9178 | 1a022d4f1bc3 |
child 12379 | 2cf45b79ce3a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
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#include "gc_implementation/parallelScavenge/psMarkSweepDecorator.hpp" |
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#include "gc_implementation/parallelScavenge/psScavenge.hpp" |
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#include "gc_implementation/parallelScavenge/psYoungGen.hpp" |
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#include "gc_implementation/shared/gcUtil.hpp" |
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#include "gc_implementation/shared/mutableNUMASpace.hpp" |
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#include "gc_implementation/shared/spaceDecorator.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/java.hpp" |
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PSYoungGen::PSYoungGen(size_t initial_size, |
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size_t min_size, |
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size_t max_size) : |
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_init_gen_size(initial_size), |
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_min_gen_size(min_size), |
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_max_gen_size(max_size) |
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{} |
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void PSYoungGen::initialize_virtual_space(ReservedSpace rs, size_t alignment) { |
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assert(_init_gen_size != 0, "Should have a finite size"); |
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_virtual_space = new PSVirtualSpace(rs, alignment); |
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if (!virtual_space()->expand_by(_init_gen_size)) { |
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vm_exit_during_initialization("Could not reserve enough space for " |
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"object heap"); |
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} |
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} |
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void PSYoungGen::initialize(ReservedSpace rs, size_t alignment) { |
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initialize_virtual_space(rs, alignment); |
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initialize_work(); |
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} |
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void PSYoungGen::initialize_work() { |
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_reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
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(HeapWord*)virtual_space()->high_boundary()); |
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|
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MemRegion cmr((HeapWord*)virtual_space()->low(), |
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(HeapWord*)virtual_space()->high()); |
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Universe::heap()->barrier_set()->resize_covered_region(cmr); |
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if (ZapUnusedHeapArea) { |
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// Mangle newly committed space immediately because it |
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// can be done here more simply that after the new |
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// spaces have been computed. |
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SpaceMangler::mangle_region(cmr); |
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} |
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if (UseNUMA) { |
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_eden_space = new MutableNUMASpace(virtual_space()->alignment()); |
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} else { |
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_eden_space = new MutableSpace(virtual_space()->alignment()); |
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} |
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_from_space = new MutableSpace(virtual_space()->alignment()); |
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_to_space = new MutableSpace(virtual_space()->alignment()); |
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if (_eden_space == NULL || _from_space == NULL || _to_space == NULL) { |
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vm_exit_during_initialization("Could not allocate a young gen space"); |
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} |
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// Allocate the mark sweep views of spaces |
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_eden_mark_sweep = |
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new PSMarkSweepDecorator(_eden_space, NULL, MarkSweepDeadRatio); |
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_from_mark_sweep = |
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new PSMarkSweepDecorator(_from_space, NULL, MarkSweepDeadRatio); |
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_to_mark_sweep = |
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new PSMarkSweepDecorator(_to_space, NULL, MarkSweepDeadRatio); |
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if (_eden_mark_sweep == NULL || |
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_from_mark_sweep == NULL || |
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_to_mark_sweep == NULL) { |
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vm_exit_during_initialization("Could not complete allocation" |
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" of the young generation"); |
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} |
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// Generation Counters - generation 0, 3 subspaces |
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_gen_counters = new PSGenerationCounters("new", 0, 3, _virtual_space); |
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// Compute maximum space sizes for performance counters |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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size_t alignment = heap->intra_heap_alignment(); |
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size_t size = virtual_space()->reserved_size(); |
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size_t max_survivor_size; |
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size_t max_eden_size; |
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if (UseAdaptiveSizePolicy) { |
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max_survivor_size = size / MinSurvivorRatio; |
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// round the survivor space size down to the nearest alignment |
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// and make sure its size is greater than 0. |
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max_survivor_size = align_size_down(max_survivor_size, alignment); |
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max_survivor_size = MAX2(max_survivor_size, alignment); |
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// set the maximum size of eden to be the size of the young gen |
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// less two times the minimum survivor size. The minimum survivor |
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// size for UseAdaptiveSizePolicy is one alignment. |
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max_eden_size = size - 2 * alignment; |
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} else { |
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max_survivor_size = size / InitialSurvivorRatio; |
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// round the survivor space size down to the nearest alignment |
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// and make sure its size is greater than 0. |
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max_survivor_size = align_size_down(max_survivor_size, alignment); |
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max_survivor_size = MAX2(max_survivor_size, alignment); |
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// set the maximum size of eden to be the size of the young gen |
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// less two times the survivor size when the generation is 100% |
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// committed. The minimum survivor size for -UseAdaptiveSizePolicy |
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// is dependent on the committed portion (current capacity) of the |
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// generation - the less space committed, the smaller the survivor |
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// space, possibly as small as an alignment. However, we are interested |
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// in the case where the young generation is 100% committed, as this |
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// is the point where eden reachs its maximum size. At this point, |
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// the size of a survivor space is max_survivor_size. |
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max_eden_size = size - 2 * max_survivor_size; |
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} |
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_eden_counters = new SpaceCounters("eden", 0, max_eden_size, _eden_space, |
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_gen_counters); |
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_from_counters = new SpaceCounters("s0", 1, max_survivor_size, _from_space, |
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_gen_counters); |
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_to_counters = new SpaceCounters("s1", 2, max_survivor_size, _to_space, |
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_gen_counters); |
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compute_initial_space_boundaries(); |
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} |
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void PSYoungGen::compute_initial_space_boundaries() { |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
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// Compute sizes |
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size_t alignment = heap->intra_heap_alignment(); |
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size_t size = virtual_space()->committed_size(); |
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size_t survivor_size = size / InitialSurvivorRatio; |
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survivor_size = align_size_down(survivor_size, alignment); |
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// ... but never less than an alignment |
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survivor_size = MAX2(survivor_size, alignment); |
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// Young generation is eden + 2 survivor spaces |
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size_t eden_size = size - (2 * survivor_size); |
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// Now go ahead and set 'em. |
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set_space_boundaries(eden_size, survivor_size); |
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space_invariants(); |
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if (UsePerfData) { |
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_eden_counters->update_capacity(); |
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_from_counters->update_capacity(); |
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_to_counters->update_capacity(); |
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} |
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} |
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void PSYoungGen::set_space_boundaries(size_t eden_size, size_t survivor_size) { |
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assert(eden_size < virtual_space()->committed_size(), "just checking"); |
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assert(eden_size > 0 && survivor_size > 0, "just checking"); |
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// Initial layout is Eden, to, from. After swapping survivor spaces, |
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// that leaves us with Eden, from, to, which is step one in our two |
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// step resize-with-live-data procedure. |
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char *eden_start = virtual_space()->low(); |
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char *to_start = eden_start + eden_size; |
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char *from_start = to_start + survivor_size; |
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char *from_end = from_start + survivor_size; |
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assert(from_end == virtual_space()->high(), "just checking"); |
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assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); |
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assert(is_object_aligned((intptr_t)to_start), "checking alignment"); |
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assert(is_object_aligned((intptr_t)from_start), "checking alignment"); |
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MemRegion eden_mr((HeapWord*)eden_start, (HeapWord*)to_start); |
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MemRegion to_mr ((HeapWord*)to_start, (HeapWord*)from_start); |
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MemRegion from_mr((HeapWord*)from_start, (HeapWord*)from_end); |
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eden_space()->initialize(eden_mr, true, ZapUnusedHeapArea); |
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to_space()->initialize(to_mr , true, ZapUnusedHeapArea); |
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from_space()->initialize(from_mr, true, ZapUnusedHeapArea); |
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} |
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#ifndef PRODUCT |
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void PSYoungGen::space_invariants() { |
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ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
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const size_t alignment = heap->intra_heap_alignment(); |
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212 |
// Currently, our eden size cannot shrink to zero |
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guarantee(eden_space()->capacity_in_bytes() >= alignment, "eden too small"); |
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guarantee(from_space()->capacity_in_bytes() >= alignment, "from too small"); |
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guarantee(to_space()->capacity_in_bytes() >= alignment, "to too small"); |
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217 |
// Relationship of spaces to each other |
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218 |
char* eden_start = (char*)eden_space()->bottom(); |
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219 |
char* eden_end = (char*)eden_space()->end(); |
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220 |
char* from_start = (char*)from_space()->bottom(); |
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221 |
char* from_end = (char*)from_space()->end(); |
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222 |
char* to_start = (char*)to_space()->bottom(); |
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223 |
char* to_end = (char*)to_space()->end(); |
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guarantee(eden_start >= virtual_space()->low(), "eden bottom"); |
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guarantee(eden_start < eden_end, "eden space consistency"); |
227 |
guarantee(from_start < from_end, "from space consistency"); |
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228 |
guarantee(to_start < to_end, "to space consistency"); |
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229 |
||
230 |
// Check whether from space is below to space |
|
231 |
if (from_start < to_start) { |
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232 |
// Eden, from, to |
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233 |
guarantee(eden_end <= from_start, "eden/from boundary"); |
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guarantee(from_end <= to_start, "from/to boundary"); |
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guarantee(to_end <= virtual_space()->high(), "to end"); |
1 | 236 |
} else { |
237 |
// Eden, to, from |
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238 |
guarantee(eden_end <= to_start, "eden/to boundary"); |
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guarantee(to_end <= from_start, "to/from boundary"); |
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guarantee(from_end <= virtual_space()->high(), "from end"); |
1 | 241 |
} |
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// More checks that the virtual space is consistent with the spaces |
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assert(virtual_space()->committed_size() >= |
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(eden_space()->capacity_in_bytes() + |
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to_space()->capacity_in_bytes() + |
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from_space()->capacity_in_bytes()), "Committed size is inconsistent"); |
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assert(virtual_space()->committed_size() <= virtual_space()->reserved_size(), |
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"Space invariant"); |
250 |
char* eden_top = (char*)eden_space()->top(); |
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char* from_top = (char*)from_space()->top(); |
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char* to_top = (char*)to_space()->top(); |
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assert(eden_top <= virtual_space()->high(), "eden top"); |
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assert(from_top <= virtual_space()->high(), "from top"); |
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assert(to_top <= virtual_space()->high(), "to top"); |
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virtual_space()->verify(); |
1 | 258 |
} |
259 |
#endif |
|
260 |
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261 |
void PSYoungGen::resize(size_t eden_size, size_t survivor_size) { |
|
262 |
// Resize the generation if needed. If the generation resize |
|
263 |
// reports false, do not attempt to resize the spaces. |
|
264 |
if (resize_generation(eden_size, survivor_size)) { |
|
265 |
// Then we lay out the spaces inside the generation |
|
266 |
resize_spaces(eden_size, survivor_size); |
|
267 |
||
268 |
space_invariants(); |
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269 |
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270 |
if (PrintAdaptiveSizePolicy && Verbose) { |
|
271 |
gclog_or_tty->print_cr("Young generation size: " |
|
272 |
"desired eden: " SIZE_FORMAT " survivor: " SIZE_FORMAT |
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273 |
" used: " SIZE_FORMAT " capacity: " SIZE_FORMAT |
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274 |
" gen limits: " SIZE_FORMAT " / " SIZE_FORMAT, |
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275 |
eden_size, survivor_size, used_in_bytes(), capacity_in_bytes(), |
|
276 |
_max_gen_size, min_gen_size()); |
|
277 |
} |
|
278 |
} |
|
279 |
} |
|
280 |
||
281 |
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282 |
bool PSYoungGen::resize_generation(size_t eden_size, size_t survivor_size) { |
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const size_t alignment = virtual_space()->alignment(); |
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size_t orig_size = virtual_space()->committed_size(); |
1 | 285 |
bool size_changed = false; |
286 |
||
287 |
// There used to be this guarantee there. |
|
288 |
// guarantee ((eden_size + 2*survivor_size) <= _max_gen_size, "incorrect input arguments"); |
|
289 |
// Code below forces this requirement. In addition the desired eden |
|
290 |
// size and disired survivor sizes are desired goals and may |
|
291 |
// exceed the total generation size. |
|
292 |
||
293 |
assert(min_gen_size() <= orig_size && orig_size <= max_size(), "just checking"); |
|
294 |
||
295 |
// Adjust new generation size |
|
296 |
const size_t eden_plus_survivors = |
|
297 |
align_size_up(eden_size + 2 * survivor_size, alignment); |
|
298 |
size_t desired_size = MAX2(MIN2(eden_plus_survivors, max_size()), |
|
299 |
min_gen_size()); |
|
300 |
assert(desired_size <= max_size(), "just checking"); |
|
301 |
||
302 |
if (desired_size > orig_size) { |
|
303 |
// Grow the generation |
|
304 |
size_t change = desired_size - orig_size; |
|
305 |
assert(change % alignment == 0, "just checking"); |
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HeapWord* prev_high = (HeapWord*) virtual_space()->high(); |
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if (!virtual_space()->expand_by(change)) { |
1 | 308 |
return false; // Error if we fail to resize! |
309 |
} |
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if (ZapUnusedHeapArea) { |
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// Mangle newly committed space immediately because it |
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// can be done here more simply that after the new |
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// spaces have been computed. |
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HeapWord* new_high = (HeapWord*) virtual_space()->high(); |
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MemRegion mangle_region(prev_high, new_high); |
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SpaceMangler::mangle_region(mangle_region); |
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} |
1 | 318 |
size_changed = true; |
319 |
} else if (desired_size < orig_size) { |
|
320 |
size_t desired_change = orig_size - desired_size; |
|
321 |
assert(desired_change % alignment == 0, "just checking"); |
|
322 |
||
323 |
desired_change = limit_gen_shrink(desired_change); |
|
324 |
||
325 |
if (desired_change > 0) { |
|
326 |
virtual_space()->shrink_by(desired_change); |
|
327 |
reset_survivors_after_shrink(); |
|
328 |
||
329 |
size_changed = true; |
|
330 |
} |
|
331 |
} else { |
|
332 |
if (Verbose && PrintGC) { |
|
333 |
if (orig_size == gen_size_limit()) { |
|
334 |
gclog_or_tty->print_cr("PSYoung generation size at maximum: " |
|
335 |
SIZE_FORMAT "K", orig_size/K); |
|
336 |
} else if (orig_size == min_gen_size()) { |
|
337 |
gclog_or_tty->print_cr("PSYoung generation size at minium: " |
|
338 |
SIZE_FORMAT "K", orig_size/K); |
|
339 |
} |
|
340 |
} |
|
341 |
} |
|
342 |
||
343 |
if (size_changed) { |
|
344 |
post_resize(); |
|
345 |
||
346 |
if (Verbose && PrintGC) { |
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size_t current_size = virtual_space()->committed_size(); |
1 | 348 |
gclog_or_tty->print_cr("PSYoung generation size changed: " |
349 |
SIZE_FORMAT "K->" SIZE_FORMAT "K", |
|
350 |
orig_size/K, current_size/K); |
|
351 |
} |
|
352 |
} |
|
353 |
||
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guarantee(eden_plus_survivors <= virtual_space()->committed_size() || |
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|
355 |
virtual_space()->committed_size() == max_size(), "Sanity"); |
1 | 356 |
|
357 |
return true; |
|
358 |
} |
|
359 |
||
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|
360 |
#ifndef PRODUCT |
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|
361 |
// In the numa case eden is not mangled so a survivor space |
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// moving into a region previously occupied by a survivor |
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363 |
// may find an unmangled region. Also in the PS case eden |
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364 |
// to-space and from-space may not touch (i.e., there may be |
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365 |
// gaps between them due to movement while resizing the |
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366 |
// spaces). Those gaps must be mangled. |
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367 |
void PSYoungGen::mangle_survivors(MutableSpace* s1, |
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MemRegion s1MR, |
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369 |
MutableSpace* s2, |
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370 |
MemRegion s2MR) { |
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371 |
// Check eden and gap between eden and from-space, in deciding |
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372 |
// what to mangle in from-space. Check the gap between from-space |
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373 |
// and to-space when deciding what to mangle. |
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|
374 |
// |
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|
375 |
// +--------+ +----+ +---+ |
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|
376 |
// | eden | |s1 | |s2 | |
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377 |
// +--------+ +----+ +---+ |
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378 |
// +-------+ +-----+ |
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379 |
// |s1MR | |s2MR | |
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380 |
// +-------+ +-----+ |
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381 |
// All of survivor-space is properly mangled so find the |
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|
382 |
// upper bound on the mangling for any portion above current s1. |
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|
383 |
HeapWord* delta_end = MIN2(s1->bottom(), s1MR.end()); |
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|
384 |
MemRegion delta1_left; |
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|
385 |
if (s1MR.start() < delta_end) { |
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|
386 |
delta1_left = MemRegion(s1MR.start(), delta_end); |
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|
387 |
s1->mangle_region(delta1_left); |
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|
388 |
} |
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|
389 |
// Find any portion to the right of the current s1. |
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|
390 |
HeapWord* delta_start = MAX2(s1->end(), s1MR.start()); |
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|
391 |
MemRegion delta1_right; |
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|
392 |
if (delta_start < s1MR.end()) { |
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|
393 |
delta1_right = MemRegion(delta_start, s1MR.end()); |
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|
394 |
s1->mangle_region(delta1_right); |
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|
395 |
} |
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|
396 |
|
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|
397 |
// Similarly for the second survivor space except that |
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|
398 |
// any of the new region that overlaps with the current |
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|
399 |
// region of the first survivor space has already been |
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|
400 |
// mangled. |
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|
401 |
delta_end = MIN2(s2->bottom(), s2MR.end()); |
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|
402 |
delta_start = MAX2(s2MR.start(), s1->end()); |
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|
403 |
MemRegion delta2_left; |
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|
404 |
if (s2MR.start() < delta_end) { |
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|
405 |
delta2_left = MemRegion(s2MR.start(), delta_end); |
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|
406 |
s2->mangle_region(delta2_left); |
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|
407 |
} |
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|
408 |
delta_start = MAX2(s2->end(), s2MR.start()); |
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|
409 |
MemRegion delta2_right; |
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|
410 |
if (delta_start < s2MR.end()) { |
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|
411 |
s2->mangle_region(delta2_right); |
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|
412 |
} |
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|
413 |
|
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|
414 |
if (TraceZapUnusedHeapArea) { |
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|
415 |
// s1 |
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|
416 |
gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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|
417 |
"New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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|
418 |
s1->bottom(), s1->end(), s1MR.start(), s1MR.end()); |
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|
419 |
gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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|
420 |
PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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|
421 |
delta1_left.start(), delta1_left.end(), delta1_right.start(), |
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|
422 |
delta1_right.end()); |
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|
423 |
|
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|
424 |
// s2 |
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|
425 |
gclog_or_tty->print_cr("Current region: [" PTR_FORMAT ", " PTR_FORMAT ") " |
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|
426 |
"New region: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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|
427 |
s2->bottom(), s2->end(), s2MR.start(), s2MR.end()); |
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|
428 |
gclog_or_tty->print_cr(" Mangle before: [" PTR_FORMAT ", " |
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|
429 |
PTR_FORMAT ") Mangle after: [" PTR_FORMAT ", " PTR_FORMAT ")", |
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|
430 |
delta2_left.start(), delta2_left.end(), delta2_right.start(), |
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|
431 |
delta2_right.end()); |
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|
432 |
} |
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|
433 |
|
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|
434 |
} |
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|
435 |
#endif // NOT PRODUCT |
1 | 436 |
|
437 |
void PSYoungGen::resize_spaces(size_t requested_eden_size, |
|
438 |
size_t requested_survivor_size) { |
|
439 |
assert(UseAdaptiveSizePolicy, "sanity check"); |
|
440 |
assert(requested_eden_size > 0 && requested_survivor_size > 0, |
|
441 |
"just checking"); |
|
442 |
||
443 |
// We require eden and to space to be empty |
|
444 |
if ((!eden_space()->is_empty()) || (!to_space()->is_empty())) { |
|
445 |
return; |
|
446 |
} |
|
447 |
||
448 |
if (PrintAdaptiveSizePolicy && Verbose) { |
|
449 |
gclog_or_tty->print_cr("PSYoungGen::resize_spaces(requested_eden_size: " |
|
450 |
SIZE_FORMAT |
|
451 |
", requested_survivor_size: " SIZE_FORMAT ")", |
|
452 |
requested_eden_size, requested_survivor_size); |
|
453 |
gclog_or_tty->print_cr(" eden: [" PTR_FORMAT ".." PTR_FORMAT ") " |
|
454 |
SIZE_FORMAT, |
|
455 |
eden_space()->bottom(), |
|
456 |
eden_space()->end(), |
|
457 |
pointer_delta(eden_space()->end(), |
|
458 |
eden_space()->bottom(), |
|
459 |
sizeof(char))); |
|
460 |
gclog_or_tty->print_cr(" from: [" PTR_FORMAT ".." PTR_FORMAT ") " |
|
461 |
SIZE_FORMAT, |
|
462 |
from_space()->bottom(), |
|
463 |
from_space()->end(), |
|
464 |
pointer_delta(from_space()->end(), |
|
465 |
from_space()->bottom(), |
|
466 |
sizeof(char))); |
|
467 |
gclog_or_tty->print_cr(" to: [" PTR_FORMAT ".." PTR_FORMAT ") " |
|
468 |
SIZE_FORMAT, |
|
469 |
to_space()->bottom(), |
|
470 |
to_space()->end(), |
|
471 |
pointer_delta( to_space()->end(), |
|
472 |
to_space()->bottom(), |
|
473 |
sizeof(char))); |
|
474 |
} |
|
475 |
||
476 |
// There's nothing to do if the new sizes are the same as the current |
|
477 |
if (requested_survivor_size == to_space()->capacity_in_bytes() && |
|
478 |
requested_survivor_size == from_space()->capacity_in_bytes() && |
|
479 |
requested_eden_size == eden_space()->capacity_in_bytes()) { |
|
480 |
if (PrintAdaptiveSizePolicy && Verbose) { |
|
481 |
gclog_or_tty->print_cr(" capacities are the right sizes, returning"); |
|
482 |
} |
|
483 |
return; |
|
484 |
} |
|
485 |
||
486 |
char* eden_start = (char*)eden_space()->bottom(); |
|
487 |
char* eden_end = (char*)eden_space()->end(); |
|
488 |
char* from_start = (char*)from_space()->bottom(); |
|
489 |
char* from_end = (char*)from_space()->end(); |
|
490 |
char* to_start = (char*)to_space()->bottom(); |
|
491 |
char* to_end = (char*)to_space()->end(); |
|
492 |
||
493 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
186
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diff
changeset
|
494 |
const size_t alignment = heap->intra_heap_alignment(); |
1 | 495 |
const bool maintain_minimum = |
496 |
(requested_eden_size + 2 * requested_survivor_size) <= min_gen_size(); |
|
497 |
||
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diff
changeset
|
498 |
bool eden_from_to_order = from_start < to_start; |
1 | 499 |
// Check whether from space is below to space |
971
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diff
changeset
|
500 |
if (eden_from_to_order) { |
1 | 501 |
// Eden, from, to |
971
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parents:
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changeset
|
502 |
eden_from_to_order = true; |
1 | 503 |
if (PrintAdaptiveSizePolicy && Verbose) { |
504 |
gclog_or_tty->print_cr(" Eden, from, to:"); |
|
505 |
} |
|
506 |
||
507 |
// Set eden |
|
508 |
// "requested_eden_size" is a goal for the size of eden |
|
509 |
// and may not be attainable. "eden_size" below is |
|
510 |
// calculated based on the location of from-space and |
|
511 |
// the goal for the size of eden. from-space is |
|
512 |
// fixed in place because it contains live data. |
|
513 |
// The calculation is done this way to avoid 32bit |
|
514 |
// overflow (i.e., eden_start + requested_eden_size |
|
515 |
// may too large for representation in 32bits). |
|
516 |
size_t eden_size; |
|
517 |
if (maintain_minimum) { |
|
518 |
// Only make eden larger than the requested size if |
|
519 |
// the minimum size of the generation has to be maintained. |
|
520 |
// This could be done in general but policy at a higher |
|
521 |
// level is determining a requested size for eden and that |
|
522 |
// should be honored unless there is a fundamental reason. |
|
523 |
eden_size = pointer_delta(from_start, |
|
524 |
eden_start, |
|
525 |
sizeof(char)); |
|
526 |
} else { |
|
527 |
eden_size = MIN2(requested_eden_size, |
|
528 |
pointer_delta(from_start, eden_start, sizeof(char))); |
|
529 |
} |
|
530 |
||
531 |
eden_end = eden_start + eden_size; |
|
5402
c51fd0c1d005
6888953: some calls to function-like macros are missing semicolons
jcoomes
parents:
2105
diff
changeset
|
532 |
assert(eden_end >= eden_start, "addition overflowed"); |
1 | 533 |
|
534 |
// To may resize into from space as long as it is clear of live data. |
|
535 |
// From space must remain page aligned, though, so we need to do some |
|
536 |
// extra calculations. |
|
537 |
||
538 |
// First calculate an optimal to-space |
|
971
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parents:
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diff
changeset
|
539 |
to_end = (char*)virtual_space()->high(); |
1 | 540 |
to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, |
541 |
sizeof(char)); |
|
542 |
||
543 |
// Does the optimal to-space overlap from-space? |
|
544 |
if (to_start < (char*)from_space()->end()) { |
|
545 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
546 |
||
547 |
// Calculate the minimum offset possible for from_end |
|
548 |
size_t from_size = pointer_delta(from_space()->top(), from_start, sizeof(char)); |
|
549 |
||
550 |
// Should we be in this method if from_space is empty? Why not the set_space method? FIX ME! |
|
551 |
if (from_size == 0) { |
|
552 |
from_size = alignment; |
|
553 |
} else { |
|
554 |
from_size = align_size_up(from_size, alignment); |
|
555 |
} |
|
556 |
||
557 |
from_end = from_start + from_size; |
|
558 |
assert(from_end > from_start, "addition overflow or from_size problem"); |
|
559 |
||
560 |
guarantee(from_end <= (char*)from_space()->end(), "from_end moved to the right"); |
|
561 |
||
562 |
// Now update to_start with the new from_end |
|
563 |
to_start = MAX2(from_end, to_start); |
|
564 |
} |
|
565 |
||
566 |
guarantee(to_start != to_end, "to space is zero sized"); |
|
567 |
||
568 |
if (PrintAdaptiveSizePolicy && Verbose) { |
|
569 |
gclog_or_tty->print_cr(" [eden_start .. eden_end): " |
|
570 |
"[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, |
|
571 |
eden_start, |
|
572 |
eden_end, |
|
573 |
pointer_delta(eden_end, eden_start, sizeof(char))); |
|
574 |
gclog_or_tty->print_cr(" [from_start .. from_end): " |
|
575 |
"[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, |
|
576 |
from_start, |
|
577 |
from_end, |
|
578 |
pointer_delta(from_end, from_start, sizeof(char))); |
|
579 |
gclog_or_tty->print_cr(" [ to_start .. to_end): " |
|
580 |
"[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, |
|
581 |
to_start, |
|
582 |
to_end, |
|
583 |
pointer_delta( to_end, to_start, sizeof(char))); |
|
584 |
} |
|
585 |
} else { |
|
586 |
// Eden, to, from |
|
587 |
if (PrintAdaptiveSizePolicy && Verbose) { |
|
588 |
gclog_or_tty->print_cr(" Eden, to, from:"); |
|
589 |
} |
|
590 |
||
591 |
// To space gets priority over eden resizing. Note that we position |
|
592 |
// to space as if we were able to resize from space, even though from |
|
593 |
// space is not modified. |
|
594 |
// Giving eden priority was tried and gave poorer performance. |
|
971
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6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
595 |
to_end = (char*)pointer_delta(virtual_space()->high(), |
1 | 596 |
(char*)requested_survivor_size, |
597 |
sizeof(char)); |
|
598 |
to_end = MIN2(to_end, from_start); |
|
599 |
to_start = (char*)pointer_delta(to_end, (char*)requested_survivor_size, |
|
600 |
sizeof(char)); |
|
601 |
// if the space sizes are to be increased by several times then |
|
602 |
// 'to_start' will point beyond the young generation. In this case |
|
603 |
// 'to_start' should be adjusted. |
|
604 |
to_start = MAX2(to_start, eden_start + alignment); |
|
605 |
||
606 |
// Compute how big eden can be, then adjust end. |
|
607 |
// See comments above on calculating eden_end. |
|
608 |
size_t eden_size; |
|
609 |
if (maintain_minimum) { |
|
610 |
eden_size = pointer_delta(to_start, eden_start, sizeof(char)); |
|
611 |
} else { |
|
612 |
eden_size = MIN2(requested_eden_size, |
|
613 |
pointer_delta(to_start, eden_start, sizeof(char))); |
|
614 |
} |
|
615 |
eden_end = eden_start + eden_size; |
|
5402
c51fd0c1d005
6888953: some calls to function-like macros are missing semicolons
jcoomes
parents:
2105
diff
changeset
|
616 |
assert(eden_end >= eden_start, "addition overflowed"); |
1 | 617 |
|
618 |
// Could choose to not let eden shrink |
|
619 |
// to_start = MAX2(to_start, eden_end); |
|
620 |
||
621 |
// Don't let eden shrink down to 0 or less. |
|
622 |
eden_end = MAX2(eden_end, eden_start + alignment); |
|
623 |
to_start = MAX2(to_start, eden_end); |
|
624 |
||
625 |
if (PrintAdaptiveSizePolicy && Verbose) { |
|
626 |
gclog_or_tty->print_cr(" [eden_start .. eden_end): " |
|
627 |
"[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, |
|
628 |
eden_start, |
|
629 |
eden_end, |
|
630 |
pointer_delta(eden_end, eden_start, sizeof(char))); |
|
631 |
gclog_or_tty->print_cr(" [ to_start .. to_end): " |
|
632 |
"[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, |
|
633 |
to_start, |
|
634 |
to_end, |
|
635 |
pointer_delta( to_end, to_start, sizeof(char))); |
|
636 |
gclog_or_tty->print_cr(" [from_start .. from_end): " |
|
637 |
"[" PTR_FORMAT " .. " PTR_FORMAT ") " SIZE_FORMAT, |
|
638 |
from_start, |
|
639 |
from_end, |
|
640 |
pointer_delta(from_end, from_start, sizeof(char))); |
|
641 |
} |
|
642 |
} |
|
643 |
||
644 |
||
645 |
guarantee((HeapWord*)from_start <= from_space()->bottom(), |
|
646 |
"from start moved to the right"); |
|
647 |
guarantee((HeapWord*)from_end >= from_space()->top(), |
|
648 |
"from end moved into live data"); |
|
649 |
assert(is_object_aligned((intptr_t)eden_start), "checking alignment"); |
|
650 |
assert(is_object_aligned((intptr_t)from_start), "checking alignment"); |
|
651 |
assert(is_object_aligned((intptr_t)to_start), "checking alignment"); |
|
652 |
||
653 |
MemRegion edenMR((HeapWord*)eden_start, (HeapWord*)eden_end); |
|
654 |
MemRegion toMR ((HeapWord*)to_start, (HeapWord*)to_end); |
|
655 |
MemRegion fromMR((HeapWord*)from_start, (HeapWord*)from_end); |
|
656 |
||
657 |
// Let's make sure the call to initialize doesn't reset "top"! |
|
658 |
HeapWord* old_from_top = from_space()->top(); |
|
659 |
||
660 |
// For PrintAdaptiveSizePolicy block below |
|
661 |
size_t old_from = from_space()->capacity_in_bytes(); |
|
662 |
size_t old_to = to_space()->capacity_in_bytes(); |
|
663 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
664 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
665 |
// NUMA is a special case because a numa space is not mangled |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
666 |
// in order to not prematurely bind its address to memory to |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
667 |
// the wrong memory (i.e., don't want the GC thread to first |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
668 |
// touch the memory). The survivor spaces are not numa |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
669 |
// spaces and are mangled. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
670 |
if (UseNUMA) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
671 |
if (eden_from_to_order) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
672 |
mangle_survivors(from_space(), fromMR, to_space(), toMR); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
673 |
} else { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
674 |
mangle_survivors(to_space(), toMR, from_space(), fromMR); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
675 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
676 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
677 |
|
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
678 |
// If not mangling the spaces, do some checking to verify that |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
679 |
// the spaces are already mangled. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
680 |
// The spaces should be correctly mangled at this point so |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
681 |
// do some checking here. Note that they are not being mangled |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
682 |
// in the calls to initialize(). |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
683 |
// Must check mangling before the spaces are reshaped. Otherwise, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
684 |
// the bottom or end of one space may have moved into an area |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
685 |
// covered by another space and a failure of the check may |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
686 |
// not correctly indicate which space is not properly mangled. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
687 |
HeapWord* limit = (HeapWord*) virtual_space()->high(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
688 |
eden_space()->check_mangled_unused_area(limit); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
689 |
from_space()->check_mangled_unused_area(limit); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
690 |
to_space()->check_mangled_unused_area(limit); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
691 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
692 |
// When an existing space is being initialized, it is not |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
693 |
// mangled because the space has been previously mangled. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
694 |
eden_space()->initialize(edenMR, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
695 |
SpaceDecorator::Clear, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
696 |
SpaceDecorator::DontMangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
697 |
to_space()->initialize(toMR, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
698 |
SpaceDecorator::Clear, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
699 |
SpaceDecorator::DontMangle); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
700 |
from_space()->initialize(fromMR, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
701 |
SpaceDecorator::DontClear, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
702 |
SpaceDecorator::DontMangle); |
1 | 703 |
|
704 |
assert(from_space()->top() == old_from_top, "from top changed!"); |
|
705 |
||
706 |
if (PrintAdaptiveSizePolicy) { |
|
707 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
708 |
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
|
709 |
||
710 |
gclog_or_tty->print("AdaptiveSizePolicy::survivor space sizes: " |
|
711 |
"collection: %d " |
|
712 |
"(" SIZE_FORMAT ", " SIZE_FORMAT ") -> " |
|
713 |
"(" SIZE_FORMAT ", " SIZE_FORMAT ") ", |
|
714 |
heap->total_collections(), |
|
715 |
old_from, old_to, |
|
716 |
from_space()->capacity_in_bytes(), |
|
717 |
to_space()->capacity_in_bytes()); |
|
718 |
gclog_or_tty->cr(); |
|
719 |
} |
|
720 |
} |
|
721 |
||
722 |
void PSYoungGen::swap_spaces() { |
|
723 |
MutableSpace* s = from_space(); |
|
724 |
_from_space = to_space(); |
|
725 |
_to_space = s; |
|
726 |
||
727 |
// Now update the decorators. |
|
728 |
PSMarkSweepDecorator* md = from_mark_sweep(); |
|
729 |
_from_mark_sweep = to_mark_sweep(); |
|
730 |
_to_mark_sweep = md; |
|
731 |
||
732 |
assert(from_mark_sweep()->space() == from_space(), "Sanity"); |
|
733 |
assert(to_mark_sweep()->space() == to_space(), "Sanity"); |
|
734 |
} |
|
735 |
||
736 |
size_t PSYoungGen::capacity_in_bytes() const { |
|
737 |
return eden_space()->capacity_in_bytes() |
|
738 |
+ from_space()->capacity_in_bytes(); // to_space() is only used during scavenge |
|
739 |
} |
|
740 |
||
741 |
||
742 |
size_t PSYoungGen::used_in_bytes() const { |
|
743 |
return eden_space()->used_in_bytes() |
|
744 |
+ from_space()->used_in_bytes(); // to_space() is only used during scavenge |
|
745 |
} |
|
746 |
||
747 |
||
748 |
size_t PSYoungGen::free_in_bytes() const { |
|
749 |
return eden_space()->free_in_bytes() |
|
750 |
+ from_space()->free_in_bytes(); // to_space() is only used during scavenge |
|
751 |
} |
|
752 |
||
753 |
size_t PSYoungGen::capacity_in_words() const { |
|
754 |
return eden_space()->capacity_in_words() |
|
755 |
+ from_space()->capacity_in_words(); // to_space() is only used during scavenge |
|
756 |
} |
|
757 |
||
758 |
||
759 |
size_t PSYoungGen::used_in_words() const { |
|
760 |
return eden_space()->used_in_words() |
|
761 |
+ from_space()->used_in_words(); // to_space() is only used during scavenge |
|
762 |
} |
|
763 |
||
764 |
||
765 |
size_t PSYoungGen::free_in_words() const { |
|
766 |
return eden_space()->free_in_words() |
|
767 |
+ from_space()->free_in_words(); // to_space() is only used during scavenge |
|
768 |
} |
|
769 |
||
770 |
void PSYoungGen::object_iterate(ObjectClosure* blk) { |
|
771 |
eden_space()->object_iterate(blk); |
|
772 |
from_space()->object_iterate(blk); |
|
773 |
to_space()->object_iterate(blk); |
|
774 |
} |
|
775 |
||
776 |
void PSYoungGen::precompact() { |
|
777 |
eden_mark_sweep()->precompact(); |
|
778 |
from_mark_sweep()->precompact(); |
|
779 |
to_mark_sweep()->precompact(); |
|
780 |
} |
|
781 |
||
782 |
void PSYoungGen::adjust_pointers() { |
|
783 |
eden_mark_sweep()->adjust_pointers(); |
|
784 |
from_mark_sweep()->adjust_pointers(); |
|
785 |
to_mark_sweep()->adjust_pointers(); |
|
786 |
} |
|
787 |
||
788 |
void PSYoungGen::compact() { |
|
789 |
eden_mark_sweep()->compact(ZapUnusedHeapArea); |
|
790 |
from_mark_sweep()->compact(ZapUnusedHeapArea); |
|
791 |
// Mark sweep stores preserved markOops in to space, don't disturb! |
|
792 |
to_mark_sweep()->compact(false); |
|
793 |
} |
|
794 |
||
795 |
void PSYoungGen::print() const { print_on(tty); } |
|
796 |
void PSYoungGen::print_on(outputStream* st) const { |
|
797 |
st->print(" %-15s", "PSYoungGen"); |
|
798 |
if (PrintGCDetails && Verbose) { |
|
799 |
st->print(" total " SIZE_FORMAT ", used " SIZE_FORMAT, |
|
800 |
capacity_in_bytes(), used_in_bytes()); |
|
801 |
} else { |
|
802 |
st->print(" total " SIZE_FORMAT "K, used " SIZE_FORMAT "K", |
|
803 |
capacity_in_bytes()/K, used_in_bytes()/K); |
|
804 |
} |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
805 |
virtual_space()->print_space_boundaries_on(st); |
1 | 806 |
st->print(" eden"); eden_space()->print_on(st); |
807 |
st->print(" from"); from_space()->print_on(st); |
|
808 |
st->print(" to "); to_space()->print_on(st); |
|
809 |
} |
|
810 |
||
811 |
void PSYoungGen::print_used_change(size_t prev_used) const { |
|
812 |
gclog_or_tty->print(" [%s:", name()); |
|
813 |
gclog_or_tty->print(" " SIZE_FORMAT "K" |
|
814 |
"->" SIZE_FORMAT "K" |
|
815 |
"(" SIZE_FORMAT "K)", |
|
816 |
prev_used / K, used_in_bytes() / K, |
|
817 |
capacity_in_bytes() / K); |
|
818 |
gclog_or_tty->print("]"); |
|
819 |
} |
|
820 |
||
821 |
size_t PSYoungGen::available_for_expansion() { |
|
822 |
ShouldNotReachHere(); |
|
823 |
return 0; |
|
824 |
} |
|
825 |
||
826 |
size_t PSYoungGen::available_for_contraction() { |
|
827 |
ShouldNotReachHere(); |
|
828 |
return 0; |
|
829 |
} |
|
830 |
||
831 |
size_t PSYoungGen::available_to_min_gen() { |
|
832 |
assert(virtual_space()->committed_size() >= min_gen_size(), "Invariant"); |
|
833 |
return virtual_space()->committed_size() - min_gen_size(); |
|
834 |
} |
|
835 |
||
836 |
// This method assumes that from-space has live data and that |
|
837 |
// any shrinkage of the young gen is limited by location of |
|
838 |
// from-space. |
|
839 |
size_t PSYoungGen::available_to_live() { |
|
840 |
size_t delta_in_survivor = 0; |
|
841 |
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
|
186
32e6c95f8d9b
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
jmasa
parents:
1
diff
changeset
|
842 |
const size_t space_alignment = heap->intra_heap_alignment(); |
1 | 843 |
const size_t gen_alignment = heap->young_gen_alignment(); |
844 |
||
845 |
MutableSpace* space_shrinking = NULL; |
|
846 |
if (from_space()->end() > to_space()->end()) { |
|
847 |
space_shrinking = from_space(); |
|
848 |
} else { |
|
849 |
space_shrinking = to_space(); |
|
850 |
} |
|
851 |
||
852 |
// Include any space that is committed but not included in |
|
853 |
// the survivor spaces. |
|
854 |
assert(((HeapWord*)virtual_space()->high()) >= space_shrinking->end(), |
|
855 |
"Survivor space beyond high end"); |
|
856 |
size_t unused_committed = pointer_delta(virtual_space()->high(), |
|
857 |
space_shrinking->end(), sizeof(char)); |
|
858 |
||
859 |
if (space_shrinking->is_empty()) { |
|
860 |
// Don't let the space shrink to 0 |
|
861 |
assert(space_shrinking->capacity_in_bytes() >= space_alignment, |
|
862 |
"Space is too small"); |
|
863 |
delta_in_survivor = space_shrinking->capacity_in_bytes() - space_alignment; |
|
864 |
} else { |
|
865 |
delta_in_survivor = pointer_delta(space_shrinking->end(), |
|
866 |
space_shrinking->top(), |
|
867 |
sizeof(char)); |
|
868 |
} |
|
869 |
||
870 |
size_t delta_in_bytes = unused_committed + delta_in_survivor; |
|
871 |
delta_in_bytes = align_size_down(delta_in_bytes, gen_alignment); |
|
872 |
return delta_in_bytes; |
|
873 |
} |
|
874 |
||
875 |
// Return the number of bytes available for resizing down the young |
|
876 |
// generation. This is the minimum of |
|
877 |
// input "bytes" |
|
878 |
// bytes to the minimum young gen size |
|
879 |
// bytes to the size currently being used + some small extra |
|
880 |
size_t PSYoungGen::limit_gen_shrink(size_t bytes) { |
|
881 |
// Allow shrinkage into the current eden but keep eden large enough |
|
882 |
// to maintain the minimum young gen size |
|
883 |
bytes = MIN3(bytes, available_to_min_gen(), available_to_live()); |
|
884 |
return align_size_down(bytes, virtual_space()->alignment()); |
|
885 |
} |
|
886 |
||
887 |
void PSYoungGen::reset_after_change() { |
|
888 |
ShouldNotReachHere(); |
|
889 |
} |
|
890 |
||
891 |
void PSYoungGen::reset_survivors_after_shrink() { |
|
892 |
_reserved = MemRegion((HeapWord*)virtual_space()->low_boundary(), |
|
893 |
(HeapWord*)virtual_space()->high_boundary()); |
|
894 |
PSScavenge::reference_processor()->set_span(_reserved); |
|
895 |
||
896 |
MutableSpace* space_shrinking = NULL; |
|
897 |
if (from_space()->end() > to_space()->end()) { |
|
898 |
space_shrinking = from_space(); |
|
899 |
} else { |
|
900 |
space_shrinking = to_space(); |
|
901 |
} |
|
902 |
||
903 |
HeapWord* new_end = (HeapWord*)virtual_space()->high(); |
|
904 |
assert(new_end >= space_shrinking->bottom(), "Shrink was too large"); |
|
905 |
// Was there a shrink of the survivor space? |
|
906 |
if (new_end < space_shrinking->end()) { |
|
907 |
MemRegion mr(space_shrinking->bottom(), new_end); |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
908 |
space_shrinking->initialize(mr, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
909 |
SpaceDecorator::DontClear, |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
910 |
SpaceDecorator::Mangle); |
1 | 911 |
} |
912 |
} |
|
913 |
||
914 |
// This method currently does not expect to expand into eden (i.e., |
|
915 |
// the virtual space boundaries is expected to be consistent |
|
916 |
// with the eden boundaries.. |
|
917 |
void PSYoungGen::post_resize() { |
|
918 |
assert_locked_or_safepoint(Heap_lock); |
|
919 |
assert((eden_space()->bottom() < to_space()->bottom()) && |
|
920 |
(eden_space()->bottom() < from_space()->bottom()), |
|
921 |
"Eden is assumed to be below the survivor spaces"); |
|
922 |
||
923 |
MemRegion cmr((HeapWord*)virtual_space()->low(), |
|
924 |
(HeapWord*)virtual_space()->high()); |
|
925 |
Universe::heap()->barrier_set()->resize_covered_region(cmr); |
|
926 |
space_invariants(); |
|
927 |
} |
|
928 |
||
929 |
||
930 |
||
931 |
void PSYoungGen::update_counters() { |
|
932 |
if (UsePerfData) { |
|
933 |
_eden_counters->update_all(); |
|
934 |
_from_counters->update_all(); |
|
935 |
_to_counters->update_all(); |
|
936 |
_gen_counters->update_all(); |
|
937 |
} |
|
938 |
} |
|
939 |
||
940 |
void PSYoungGen::verify(bool allow_dirty) { |
|
941 |
eden_space()->verify(allow_dirty); |
|
942 |
from_space()->verify(allow_dirty); |
|
943 |
to_space()->verify(allow_dirty); |
|
944 |
} |
|
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
945 |
|
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
946 |
#ifndef PRODUCT |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
947 |
void PSYoungGen::record_spaces_top() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
948 |
assert(ZapUnusedHeapArea, "Not mangling unused space"); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
949 |
eden_space()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
950 |
from_space()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
951 |
to_space()->set_top_for_allocations(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
952 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
186
diff
changeset
|
953 |
#endif |