author | jrose |
Wed, 02 Jun 2010 22:45:42 -0700 | |
changeset 5702 | 201c5cde25bb |
parent 5547 | f4b087cbb361 |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 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 "incls/_precompiled.incl" |
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# include "incls/_adjoiningGenerations.cpp.incl" |
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// If boundary moving is being used, create the young gen and old |
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// gen with ASPSYoungGen and ASPSOldGen, respectively. Revert to |
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// the old behavior otherwise (with PSYoungGen and PSOldGen). |
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||
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AdjoiningGenerations::AdjoiningGenerations(ReservedSpace old_young_rs, |
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size_t init_low_byte_size, |
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size_t min_low_byte_size, |
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size_t max_low_byte_size, |
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size_t init_high_byte_size, |
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size_t min_high_byte_size, |
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size_t max_high_byte_size, |
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size_t alignment) : |
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_virtual_spaces(old_young_rs, min_low_byte_size, |
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min_high_byte_size, alignment) { |
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assert(min_low_byte_size <= init_low_byte_size && |
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init_low_byte_size <= max_low_byte_size, "Parameter check"); |
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assert(min_high_byte_size <= init_high_byte_size && |
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init_high_byte_size <= max_high_byte_size, "Parameter check"); |
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// Create the generations differently based on the option to |
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// move the boundary. |
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if (UseAdaptiveGCBoundary) { |
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// Initialize the adjoining virtual spaces. Then pass the |
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// a virtual to each generation for initialization of the |
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// generation. |
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// Does the actual creation of the virtual spaces |
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_virtual_spaces.initialize(max_low_byte_size, |
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init_low_byte_size, |
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init_high_byte_size); |
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// Place the young gen at the high end. Passes in the virtual space. |
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_young_gen = new ASPSYoungGen(_virtual_spaces.high(), |
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_virtual_spaces.high()->committed_size(), |
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min_high_byte_size, |
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_virtual_spaces.high_byte_size_limit()); |
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// Place the old gen at the low end. Passes in the virtual space. |
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_old_gen = new ASPSOldGen(_virtual_spaces.low(), |
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_virtual_spaces.low()->committed_size(), |
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min_low_byte_size, |
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_virtual_spaces.low_byte_size_limit(), |
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"old", 1); |
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young_gen()->initialize_work(); |
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assert(young_gen()->reserved().byte_size() <= young_gen()->gen_size_limit(), |
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"Consistency check"); |
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assert(old_young_rs.size() >= young_gen()->gen_size_limit(), |
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"Consistency check"); |
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old_gen()->initialize_work("old", 1); |
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assert(old_gen()->reserved().byte_size() <= old_gen()->gen_size_limit(), |
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"Consistency check"); |
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assert(old_young_rs.size() >= old_gen()->gen_size_limit(), |
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"Consistency check"); |
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} else { |
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// Layout the reserved space for the generations. |
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ReservedSpace old_rs = |
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virtual_spaces()->reserved_space().first_part(max_low_byte_size); |
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ReservedSpace heap_rs = |
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virtual_spaces()->reserved_space().last_part(max_low_byte_size); |
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ReservedSpace young_rs = heap_rs.first_part(max_high_byte_size); |
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assert(young_rs.size() == heap_rs.size(), "Didn't reserve all of the heap"); |
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// Create the generations. Virtual spaces are not passed in. |
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_young_gen = new PSYoungGen(init_high_byte_size, |
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min_high_byte_size, |
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max_high_byte_size); |
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_old_gen = new PSOldGen(init_low_byte_size, |
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min_low_byte_size, |
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max_low_byte_size, |
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"old", 1); |
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// The virtual spaces are created by the initialization of the gens. |
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_young_gen->initialize(young_rs, alignment); |
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assert(young_gen()->gen_size_limit() == young_rs.size(), |
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"Consistency check"); |
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_old_gen->initialize(old_rs, alignment, "old", 1); |
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assert(old_gen()->gen_size_limit() == old_rs.size(), "Consistency check"); |
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} |
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} |
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size_t AdjoiningGenerations::reserved_byte_size() { |
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return virtual_spaces()->reserved_space().size(); |
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} |
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// Make checks on the current sizes of the generations and |
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// the contraints on the sizes of the generations. Push |
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// up the boundary within the contraints. A partial |
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// push can occur. |
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void AdjoiningGenerations::request_old_gen_expansion(size_t expand_in_bytes) { |
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
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assert_lock_strong(ExpandHeap_lock); |
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assert_locked_or_safepoint(Heap_lock); |
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// These sizes limit the amount the boundaries can move. Effectively, |
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// the generation says how much it is willing to yield to the other |
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// generation. |
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const size_t young_gen_available = young_gen()->available_for_contraction(); |
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const size_t old_gen_available = old_gen()->available_for_expansion(); |
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const size_t alignment = virtual_spaces()->alignment(); |
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size_t change_in_bytes = MIN3(young_gen_available, |
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old_gen_available, |
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align_size_up_(expand_in_bytes, alignment)); |
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if (change_in_bytes == 0) { |
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return; |
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} |
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if (TraceAdaptiveGCBoundary) { |
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gclog_or_tty->print_cr("Before expansion of old gen with boundary move"); |
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gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", |
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expand_in_bytes, change_in_bytes); |
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if (!PrintHeapAtGC) { |
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Universe::print_on(gclog_or_tty); |
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} |
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gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", |
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old_gen()->max_gen_size()/K); |
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} |
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// Move the boundary between the generations up (smaller young gen). |
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if (virtual_spaces()->adjust_boundary_up(change_in_bytes)) { |
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young_gen()->reset_after_change(); |
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old_gen()->reset_after_change(); |
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} |
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// The total reserved for the generations should match the sum |
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// of the two even if the boundary is moving. |
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assert(reserved_byte_size() == |
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old_gen()->max_gen_size() + young_gen()->max_size(), |
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"Space is missing"); |
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young_gen()->space_invariants(); |
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old_gen()->space_invariants(); |
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if (TraceAdaptiveGCBoundary) { |
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gclog_or_tty->print_cr("After expansion of old gen with boundary move"); |
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if (!PrintHeapAtGC) { |
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Universe::print_on(gclog_or_tty); |
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} |
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gclog_or_tty->print_cr(" PSOldGen max size: " SIZE_FORMAT "K", |
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old_gen()->max_gen_size()/K); |
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} |
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} |
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// See comments on request_old_gen_expansion() |
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bool AdjoiningGenerations::request_young_gen_expansion(size_t expand_in_bytes) { |
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
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// If eden is not empty, the boundary can be moved but no advantage |
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// can be made of the move since eden cannot be moved. |
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if (!young_gen()->eden_space()->is_empty()) { |
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return false; |
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} |
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bool result = false; |
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const size_t young_gen_available = young_gen()->available_for_expansion(); |
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const size_t old_gen_available = old_gen()->available_for_contraction(); |
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const size_t alignment = virtual_spaces()->alignment(); |
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size_t change_in_bytes = MIN3(young_gen_available, |
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old_gen_available, |
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align_size_up_(expand_in_bytes, alignment)); |
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if (change_in_bytes == 0) { |
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return false; |
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} |
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if (TraceAdaptiveGCBoundary) { |
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gclog_or_tty->print_cr("Before expansion of young gen with boundary move"); |
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gclog_or_tty->print_cr(" Requested change: 0x%x Attempted change: 0x%x", |
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expand_in_bytes, change_in_bytes); |
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if (!PrintHeapAtGC) { |
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Universe::print_on(gclog_or_tty); |
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} |
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gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", |
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young_gen()->max_size()/K); |
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} |
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// Move the boundary between the generations down (smaller old gen). |
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MutexLocker x(ExpandHeap_lock); |
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if (virtual_spaces()->adjust_boundary_down(change_in_bytes)) { |
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young_gen()->reset_after_change(); |
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old_gen()->reset_after_change(); |
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result = true; |
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} |
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// The total reserved for the generations should match the sum |
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// of the two even if the boundary is moving. |
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assert(reserved_byte_size() == |
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old_gen()->max_gen_size() + young_gen()->max_size(), |
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"Space is missing"); |
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young_gen()->space_invariants(); |
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old_gen()->space_invariants(); |
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if (TraceAdaptiveGCBoundary) { |
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gclog_or_tty->print_cr("After expansion of young gen with boundary move"); |
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if (!PrintHeapAtGC) { |
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Universe::print_on(gclog_or_tty); |
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} |
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gclog_or_tty->print_cr(" PSYoungGen max size: " SIZE_FORMAT "K", |
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young_gen()->max_size()/K); |
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} |
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return result; |
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} |
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// Additional space is needed in the old generation. Try to move the boundary |
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// up to meet the need. Moves boundary up only |
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void AdjoiningGenerations::adjust_boundary_for_old_gen_needs( |
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size_t desired_free_space) { |
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
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// Stress testing. |
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if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 1) { |
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MutexLocker x(ExpandHeap_lock); |
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request_old_gen_expansion(virtual_spaces()->alignment() * 3 / 2); |
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} |
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// Expand only if the entire generation is already committed. |
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if (old_gen()->virtual_space()->uncommitted_size() == 0) { |
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if (old_gen()->free_in_bytes() < desired_free_space) { |
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MutexLocker x(ExpandHeap_lock); |
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request_old_gen_expansion(desired_free_space); |
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} |
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} |
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} |
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// See comment on adjust_boundary_for_old_gen_needss(). |
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// Adjust boundary down only. |
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void AdjoiningGenerations::adjust_boundary_for_young_gen_needs(size_t eden_size, |
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size_t survivor_size) { |
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assert(UseAdaptiveSizePolicy && UseAdaptiveGCBoundary, "runtime check"); |
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// Stress testing. |
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if (PSAdaptiveSizePolicyResizeVirtualSpaceAlot == 0) { |
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request_young_gen_expansion(virtual_spaces()->alignment() * 3 / 2); |
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eden_size = young_gen()->eden_space()->capacity_in_bytes(); |
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} |
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// Expand only if the entire generation is already committed. |
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if (young_gen()->virtual_space()->uncommitted_size() == 0) { |
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size_t desired_size = eden_size + 2 * survivor_size; |
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const size_t committed = young_gen()->virtual_space()->committed_size(); |
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if (desired_size > committed) { |
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request_young_gen_expansion(desired_size - committed); |
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} |
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} |
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} |