author | brutisso |
Wed, 10 Dec 2014 11:32:22 +0100 | |
changeset 28033 | ab63acbd99ec |
parent 28031 | 10aec24d2b61 |
child 30173 | 13cf7580b000 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 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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#include "precompiled.hpp" |
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#include "memory/blockOffsetTable.inline.hpp" |
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#include "memory/cardGeneration.inline.hpp" |
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#include "memory/gcLocker.hpp" |
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#include "memory/generationSpec.hpp" |
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#include "memory/genOopClosures.inline.hpp" |
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#include "memory/genRemSet.hpp" |
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#include "memory/iterator.hpp" |
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#include "memory/memRegion.hpp" |
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#include "memory/space.inline.hpp" |
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#include "runtime/java.hpp" |
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CardGeneration::CardGeneration(ReservedSpace rs, size_t initial_byte_size, |
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int level, |
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GenRemSet* remset) : |
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Generation(rs, initial_byte_size, level), _rs(remset), |
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_shrink_factor(0), _min_heap_delta_bytes(), _capacity_at_prologue(), |
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_used_at_prologue() |
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{ |
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HeapWord* start = (HeapWord*)rs.base(); |
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size_t reserved_byte_size = rs.size(); |
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assert((uintptr_t(start) & 3) == 0, "bad alignment"); |
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assert((reserved_byte_size & 3) == 0, "bad alignment"); |
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MemRegion reserved_mr(start, heap_word_size(reserved_byte_size)); |
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_bts = new BlockOffsetSharedArray(reserved_mr, |
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heap_word_size(initial_byte_size)); |
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MemRegion committed_mr(start, heap_word_size(initial_byte_size)); |
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_rs->resize_covered_region(committed_mr); |
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if (_bts == NULL) { |
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vm_exit_during_initialization("Could not allocate a BlockOffsetArray"); |
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} |
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// Verify that the start and end of this generation is the start of a card. |
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// If this wasn't true, a single card could span more than on generation, |
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// which would cause problems when we commit/uncommit memory, and when we |
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// clear and dirty cards. |
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guarantee(_rs->is_aligned(reserved_mr.start()), "generation must be card aligned"); |
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if (reserved_mr.end() != Universe::heap()->reserved_region().end()) { |
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// Don't check at the very end of the heap as we'll assert that we're probing off |
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// the end if we try. |
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guarantee(_rs->is_aligned(reserved_mr.end()), "generation must be card aligned"); |
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} |
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_min_heap_delta_bytes = MinHeapDeltaBytes; |
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_capacity_at_prologue = initial_byte_size; |
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_used_at_prologue = 0; |
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} |
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bool CardGeneration::grow_by(size_t bytes) { |
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assert_correct_size_change_locking(); |
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bool result = _virtual_space.expand_by(bytes); |
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if (result) { |
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size_t new_word_size = |
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heap_word_size(_virtual_space.committed_size()); |
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MemRegion mr(space()->bottom(), new_word_size); |
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// Expand card table |
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Universe::heap()->barrier_set()->resize_covered_region(mr); |
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// Expand shared block offset array |
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_bts->resize(new_word_size); |
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// Fix for bug #4668531 |
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if (ZapUnusedHeapArea) { |
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MemRegion mangle_region(space()->end(), |
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(HeapWord*)_virtual_space.high()); |
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SpaceMangler::mangle_region(mangle_region); |
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} |
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// Expand space -- also expands space's BOT |
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// (which uses (part of) shared array above) |
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space()->set_end((HeapWord*)_virtual_space.high()); |
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// update the space and generation capacity counters |
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update_counters(); |
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if (Verbose && PrintGC) { |
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size_t new_mem_size = _virtual_space.committed_size(); |
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size_t old_mem_size = new_mem_size - bytes; |
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gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by " |
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SIZE_FORMAT "K to " SIZE_FORMAT "K", |
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name(), old_mem_size/K, bytes/K, new_mem_size/K); |
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} |
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} |
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return result; |
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} |
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bool CardGeneration::expand(size_t bytes, size_t expand_bytes) { |
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assert_locked_or_safepoint(Heap_lock); |
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if (bytes == 0) { |
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return true; // That's what grow_by(0) would return |
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} |
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size_t aligned_bytes = ReservedSpace::page_align_size_up(bytes); |
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if (aligned_bytes == 0){ |
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// The alignment caused the number of bytes to wrap. An expand_by(0) will |
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// return true with the implication that an expansion was done when it |
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// was not. A call to expand implies a best effort to expand by "bytes" |
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// but not a guarantee. Align down to give a best effort. This is likely |
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// the most that the generation can expand since it has some capacity to |
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// start with. |
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aligned_bytes = ReservedSpace::page_align_size_down(bytes); |
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} |
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size_t aligned_expand_bytes = ReservedSpace::page_align_size_up(expand_bytes); |
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bool success = false; |
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if (aligned_expand_bytes > aligned_bytes) { |
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success = grow_by(aligned_expand_bytes); |
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} |
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if (!success) { |
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success = grow_by(aligned_bytes); |
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} |
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if (!success) { |
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success = grow_to_reserved(); |
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} |
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if (PrintGC && Verbose) { |
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if (success && GC_locker::is_active_and_needs_gc()) { |
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gclog_or_tty->print_cr("Garbage collection disabled, expanded heap instead"); |
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} |
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} |
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return success; |
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} |
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bool CardGeneration::grow_to_reserved() { |
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assert_correct_size_change_locking(); |
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bool success = true; |
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const size_t remaining_bytes = _virtual_space.uncommitted_size(); |
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if (remaining_bytes > 0) { |
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success = grow_by(remaining_bytes); |
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DEBUG_ONLY(if (!success) warning("grow to reserved failed");) |
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} |
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return success; |
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} |
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void CardGeneration::shrink(size_t bytes) { |
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assert_correct_size_change_locking(); |
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size_t size = ReservedSpace::page_align_size_down(bytes); |
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if (size == 0) { |
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return; |
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} |
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// Shrink committed space |
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_virtual_space.shrink_by(size); |
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// Shrink space; this also shrinks the space's BOT |
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space()->set_end((HeapWord*) _virtual_space.high()); |
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size_t new_word_size = heap_word_size(space()->capacity()); |
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// Shrink the shared block offset array |
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_bts->resize(new_word_size); |
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MemRegion mr(space()->bottom(), new_word_size); |
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// Shrink the card table |
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Universe::heap()->barrier_set()->resize_covered_region(mr); |
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if (Verbose && PrintGC) { |
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size_t new_mem_size = _virtual_space.committed_size(); |
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size_t old_mem_size = new_mem_size + size; |
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gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K", |
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name(), old_mem_size/K, new_mem_size/K); |
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} |
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} |
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// No young generation references, clear this generation's cards. |
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void CardGeneration::clear_remembered_set() { |
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_rs->clear(reserved()); |
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} |
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// Objects in this generation may have moved, invalidate this |
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// generation's cards. |
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void CardGeneration::invalidate_remembered_set() { |
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_rs->invalidate(used_region()); |
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} |
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void CardGeneration::compute_new_size() { |
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assert(_shrink_factor <= 100, "invalid shrink factor"); |
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size_t current_shrink_factor = _shrink_factor; |
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_shrink_factor = 0; |
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// We don't have floating point command-line arguments |
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// Note: argument processing ensures that MinHeapFreeRatio < 100. |
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const double minimum_free_percentage = MinHeapFreeRatio / 100.0; |
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const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
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// Compute some numbers about the state of the heap. |
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const size_t used_after_gc = used(); |
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const size_t capacity_after_gc = capacity(); |
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const double min_tmp = used_after_gc / maximum_used_percentage; |
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size_t minimum_desired_capacity = (size_t)MIN2(min_tmp, double(max_uintx)); |
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// Don't shrink less than the initial generation size |
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minimum_desired_capacity = MAX2(minimum_desired_capacity, |
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spec()->init_size()); |
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assert(used_after_gc <= minimum_desired_capacity, "sanity check"); |
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if (PrintGC && Verbose) { |
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216 |
const size_t free_after_gc = free(); |
|
217 |
const double free_percentage = ((double)free_after_gc) / capacity_after_gc; |
|
218 |
gclog_or_tty->print_cr("TenuredGeneration::compute_new_size: "); |
|
219 |
gclog_or_tty->print_cr(" " |
|
220 |
" minimum_free_percentage: %6.2f" |
|
221 |
" maximum_used_percentage: %6.2f", |
|
222 |
minimum_free_percentage, |
|
223 |
maximum_used_percentage); |
|
224 |
gclog_or_tty->print_cr(" " |
|
225 |
" free_after_gc : %6.1fK" |
|
226 |
" used_after_gc : %6.1fK" |
|
227 |
" capacity_after_gc : %6.1fK", |
|
228 |
free_after_gc / (double) K, |
|
229 |
used_after_gc / (double) K, |
|
230 |
capacity_after_gc / (double) K); |
|
231 |
gclog_or_tty->print_cr(" " |
|
232 |
" free_percentage: %6.2f", |
|
233 |
free_percentage); |
|
234 |
} |
|
235 |
||
236 |
if (capacity_after_gc < minimum_desired_capacity) { |
|
237 |
// If we have less free space than we want then expand |
|
238 |
size_t expand_bytes = minimum_desired_capacity - capacity_after_gc; |
|
239 |
// Don't expand unless it's significant |
|
240 |
if (expand_bytes >= _min_heap_delta_bytes) { |
|
241 |
expand(expand_bytes, 0); // safe if expansion fails |
|
242 |
} |
|
243 |
if (PrintGC && Verbose) { |
|
244 |
gclog_or_tty->print_cr(" expanding:" |
|
245 |
" minimum_desired_capacity: %6.1fK" |
|
246 |
" expand_bytes: %6.1fK" |
|
247 |
" _min_heap_delta_bytes: %6.1fK", |
|
248 |
minimum_desired_capacity / (double) K, |
|
249 |
expand_bytes / (double) K, |
|
250 |
_min_heap_delta_bytes / (double) K); |
|
251 |
} |
|
252 |
return; |
|
253 |
} |
|
254 |
||
255 |
// No expansion, now see if we want to shrink |
|
256 |
size_t shrink_bytes = 0; |
|
257 |
// We would never want to shrink more than this |
|
258 |
size_t max_shrink_bytes = capacity_after_gc - minimum_desired_capacity; |
|
259 |
||
260 |
if (MaxHeapFreeRatio < 100) { |
|
261 |
const double maximum_free_percentage = MaxHeapFreeRatio / 100.0; |
|
262 |
const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
|
263 |
const double max_tmp = used_after_gc / minimum_used_percentage; |
|
264 |
size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
|
265 |
maximum_desired_capacity = MAX2(maximum_desired_capacity, |
|
266 |
spec()->init_size()); |
|
267 |
if (PrintGC && Verbose) { |
|
268 |
gclog_or_tty->print_cr(" " |
|
269 |
" maximum_free_percentage: %6.2f" |
|
270 |
" minimum_used_percentage: %6.2f", |
|
271 |
maximum_free_percentage, |
|
272 |
minimum_used_percentage); |
|
273 |
gclog_or_tty->print_cr(" " |
|
274 |
" _capacity_at_prologue: %6.1fK" |
|
275 |
" minimum_desired_capacity: %6.1fK" |
|
276 |
" maximum_desired_capacity: %6.1fK", |
|
277 |
_capacity_at_prologue / (double) K, |
|
278 |
minimum_desired_capacity / (double) K, |
|
279 |
maximum_desired_capacity / (double) K); |
|
280 |
} |
|
281 |
assert(minimum_desired_capacity <= maximum_desired_capacity, |
|
282 |
"sanity check"); |
|
283 |
||
284 |
if (capacity_after_gc > maximum_desired_capacity) { |
|
285 |
// Capacity too large, compute shrinking size |
|
286 |
shrink_bytes = capacity_after_gc - maximum_desired_capacity; |
|
287 |
// We don't want shrink all the way back to initSize if people call |
|
288 |
// System.gc(), because some programs do that between "phases" and then |
|
289 |
// we'd just have to grow the heap up again for the next phase. So we |
|
290 |
// damp the shrinking: 0% on the first call, 10% on the second call, 40% |
|
291 |
// on the third call, and 100% by the fourth call. But if we recompute |
|
292 |
// size without shrinking, it goes back to 0%. |
|
293 |
shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
|
294 |
assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
|
295 |
if (current_shrink_factor == 0) { |
|
296 |
_shrink_factor = 10; |
|
297 |
} else { |
|
298 |
_shrink_factor = MIN2(current_shrink_factor * 4, (size_t) 100); |
|
299 |
} |
|
300 |
if (PrintGC && Verbose) { |
|
301 |
gclog_or_tty->print_cr(" " |
|
302 |
" shrinking:" |
|
303 |
" initSize: %.1fK" |
|
304 |
" maximum_desired_capacity: %.1fK", |
|
305 |
spec()->init_size() / (double) K, |
|
306 |
maximum_desired_capacity / (double) K); |
|
307 |
gclog_or_tty->print_cr(" " |
|
308 |
" shrink_bytes: %.1fK" |
|
309 |
" current_shrink_factor: " SIZE_FORMAT |
|
310 |
" new shrink factor: " SIZE_FORMAT |
|
311 |
" _min_heap_delta_bytes: %.1fK", |
|
312 |
shrink_bytes / (double) K, |
|
313 |
current_shrink_factor, |
|
314 |
_shrink_factor, |
|
315 |
_min_heap_delta_bytes / (double) K); |
|
316 |
} |
|
317 |
} |
|
318 |
} |
|
319 |
||
320 |
if (capacity_after_gc > _capacity_at_prologue) { |
|
321 |
// We might have expanded for promotions, in which case we might want to |
|
322 |
// take back that expansion if there's room after GC. That keeps us from |
|
323 |
// stretching the heap with promotions when there's plenty of room. |
|
324 |
size_t expansion_for_promotion = capacity_after_gc - _capacity_at_prologue; |
|
325 |
expansion_for_promotion = MIN2(expansion_for_promotion, max_shrink_bytes); |
|
326 |
// We have two shrinking computations, take the largest |
|
327 |
shrink_bytes = MAX2(shrink_bytes, expansion_for_promotion); |
|
328 |
assert(shrink_bytes <= max_shrink_bytes, "invalid shrink size"); |
|
329 |
if (PrintGC && Verbose) { |
|
330 |
gclog_or_tty->print_cr(" " |
|
331 |
" aggressive shrinking:" |
|
332 |
" _capacity_at_prologue: %.1fK" |
|
333 |
" capacity_after_gc: %.1fK" |
|
334 |
" expansion_for_promotion: %.1fK" |
|
335 |
" shrink_bytes: %.1fK", |
|
336 |
capacity_after_gc / (double) K, |
|
337 |
_capacity_at_prologue / (double) K, |
|
338 |
expansion_for_promotion / (double) K, |
|
339 |
shrink_bytes / (double) K); |
|
340 |
} |
|
341 |
} |
|
342 |
// Don't shrink unless it's significant |
|
343 |
if (shrink_bytes >= _min_heap_delta_bytes) { |
|
344 |
shrink(shrink_bytes); |
|
345 |
} |
|
346 |
} |
|
347 |
||
348 |
// Currently nothing to do. |
|
349 |
void CardGeneration::prepare_for_verify() {} |
|
28033
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
350 |
|
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
351 |
void CardGeneration::space_iterate(SpaceClosure* blk, |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
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parents:
28031
diff
changeset
|
352 |
bool usedOnly) { |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
353 |
blk->do_space(space()); |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
354 |
} |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
355 |
|
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
356 |
void CardGeneration::younger_refs_iterate(OopsInGenClosure* blk) { |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
357 |
blk->set_generation(this); |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
358 |
younger_refs_in_space_iterate(space(), blk); |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
359 |
blk->reset_generation(); |
ab63acbd99ec
8066782: Move common code from CMSGeneration and TenuredGeneration to CardGeneration
brutisso
parents:
28031
diff
changeset
|
360 |
} |