author | coleenp |
Thu, 27 Jan 2011 16:11:27 -0800 | |
changeset 8076 | 96d498ec7ae1 |
parent 7397 | 5b173b4ca846 |
child 8921 | 14bfe81f2a9d |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2010, 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 "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "memory/compactingPermGenGen.hpp" |
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#include "memory/filemap.hpp" |
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#include "memory/genOopClosures.inline.hpp" |
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#include "memory/generation.inline.hpp" |
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#include "memory/generationSpec.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/java.hpp" |
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#ifndef SERIALGC |
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#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp" |
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#endif |
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// An ObjectClosure helper: Recursively adjust all pointers in an object |
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// and all objects by referenced it. Clear marks on objects in order to |
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// prevent visiting any object twice. This helper is used when the |
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// RedefineClasses() API has been called. |
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class AdjustSharedObjectClosure : public ObjectClosure { |
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public: |
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void do_object(oop obj) { |
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if (obj->is_shared_readwrite()) { |
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if (obj->mark()->is_marked()) { |
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obj->init_mark(); // Don't revisit this object. |
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obj->adjust_pointers(); // Adjust this object's references. |
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} |
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} |
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} |
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}; |
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// An OopClosure helper: Recursively adjust all pointers in an object |
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// and all objects by referenced it. Clear marks on objects in order |
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// to prevent visiting any object twice. |
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class RecursiveAdjustSharedObjectClosure : public OopClosure { |
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protected: |
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template <class T> inline void do_oop_work(T* p) { |
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oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
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if (obj->is_shared_readwrite()) { |
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if (obj->mark()->is_marked()) { |
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obj->init_mark(); // Don't revisit this object. |
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obj->oop_iterate(this); // Recurse - adjust objects referenced. |
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obj->adjust_pointers(); // Adjust this object's references. |
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// Special case: if a class has a read-only constant pool, |
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// then the read-write objects referenced by the pool must |
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// have their marks reset. |
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if (obj->klass() == Universe::instanceKlassKlassObj()) { |
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instanceKlass* ik = instanceKlass::cast((klassOop)obj); |
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constantPoolOop cp = ik->constants(); |
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if (cp->is_shared_readonly()) { |
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cp->oop_iterate(this); |
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} |
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} |
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} |
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} |
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} |
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public: |
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virtual void do_oop(oop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); } |
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virtual void do_oop(narrowOop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); } |
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}; |
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// We need to go through all placeholders in the system dictionary and |
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// try to resolve them into shared classes. Other threads might be in |
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// the process of loading a shared class and have strong roots on |
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// their stack to the class without having added the class to the |
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// dictionary yet. This means the class will be marked during phase 1 |
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// but will not be unmarked during the application of the |
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// RecursiveAdjustSharedObjectClosure to the SystemDictionary. |
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class TraversePlaceholdersClosure { |
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public: |
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static void placeholders_do(Symbol* sym, oop loader) { |
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if (CompactingPermGenGen::is_shared(sym)) { |
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oop k = SystemDictionary::find_shared_class(sym); |
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if (k != NULL) { |
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RecursiveAdjustSharedObjectClosure clo; |
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clo.do_oop(&k); |
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} |
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} |
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} |
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}; |
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void CompactingPermGenGen::initialize_performance_counters() { |
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const char* gen_name = "perm"; |
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// Generation Counters - generation 2, 1 subspace |
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_gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space); |
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_space_counters = new CSpaceCounters(gen_name, 0, |
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_virtual_space.reserved_size(), |
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_the_space, _gen_counters); |
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} |
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void CompactingPermGenGen::update_counters() { |
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if (UsePerfData) { |
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_space_counters->update_all(); |
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_gen_counters->update_all(); |
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} |
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} |
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CompactingPermGenGen::CompactingPermGenGen(ReservedSpace rs, |
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ReservedSpace shared_rs, |
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size_t initial_byte_size, |
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int level, GenRemSet* remset, |
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ContiguousSpace* space, |
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PermanentGenerationSpec* spec_) : |
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OneContigSpaceCardGeneration(rs, initial_byte_size, MinPermHeapExpansion, |
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level, remset, space) { |
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set_spec(spec_); |
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if (!UseSharedSpaces && !DumpSharedSpaces) { |
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spec()->disable_sharing(); |
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} |
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// Break virtual space into address ranges for all spaces. |
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if (spec()->enable_shared_spaces()) { |
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shared_end = (HeapWord*)(shared_rs.base() + shared_rs.size()); |
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misccode_end = shared_end; |
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misccode_bottom = misccode_end - heap_word_size(spec()->misc_code_size()); |
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miscdata_end = misccode_bottom; |
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miscdata_bottom = miscdata_end - heap_word_size(spec()->misc_data_size()); |
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readwrite_end = miscdata_bottom; |
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readwrite_bottom = |
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readwrite_end - heap_word_size(spec()->read_write_size()); |
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readonly_end = readwrite_bottom; |
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readonly_bottom = |
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readonly_end - heap_word_size(spec()->read_only_size()); |
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shared_bottom = readonly_bottom; |
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unshared_end = shared_bottom; |
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assert((char*)shared_bottom == shared_rs.base(), "shared space mismatch"); |
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} else { |
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shared_end = (HeapWord*)(rs.base() + rs.size()); |
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misccode_end = shared_end; |
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misccode_bottom = shared_end; |
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miscdata_end = shared_end; |
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miscdata_bottom = shared_end; |
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readwrite_end = shared_end; |
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readwrite_bottom = shared_end; |
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readonly_end = shared_end; |
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readonly_bottom = shared_end; |
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shared_bottom = shared_end; |
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unshared_end = shared_bottom; |
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} |
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unshared_bottom = (HeapWord*) rs.base(); |
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// Verify shared and unshared spaces adjacent. |
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assert((char*)shared_bottom == rs.base()+rs.size(), "shared space mismatch"); |
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assert(unshared_end > unshared_bottom, "shared space mismatch"); |
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// Split reserved memory into pieces. |
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ReservedSpace ro_rs = shared_rs.first_part(spec()->read_only_size(), |
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UseSharedSpaces); |
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ReservedSpace tmp_rs1 = shared_rs.last_part(spec()->read_only_size()); |
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ReservedSpace rw_rs = tmp_rs1.first_part(spec()->read_write_size(), |
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UseSharedSpaces); |
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ReservedSpace tmp_rs2 = tmp_rs1.last_part(spec()->read_write_size()); |
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ReservedSpace md_rs = tmp_rs2.first_part(spec()->misc_data_size(), |
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UseSharedSpaces); |
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ReservedSpace mc_rs = tmp_rs2.last_part(spec()->misc_data_size()); |
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_shared_space_size = spec()->read_only_size() |
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+ spec()->read_write_size() |
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+ spec()->misc_data_size() |
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+ spec()->misc_code_size(); |
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// Allocate the unshared (default) space. |
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_the_space = new ContigPermSpace(_bts, |
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MemRegion(unshared_bottom, heap_word_size(initial_byte_size))); |
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if (_the_space == NULL) |
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vm_exit_during_initialization("Could not allocate an unshared" |
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" CompactingPermGen Space"); |
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// Allocate shared spaces |
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if (spec()->enable_shared_spaces()) { |
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// If mapping a shared file, the space is not committed, don't |
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// mangle. |
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NOT_PRODUCT(bool old_ZapUnusedHeapArea = ZapUnusedHeapArea;) |
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NOT_PRODUCT(if (UseSharedSpaces) ZapUnusedHeapArea = false;) |
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// Commit the memory behind the shared spaces if dumping (not |
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// mapping). |
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if (DumpSharedSpaces) { |
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_ro_vs.initialize(ro_rs, spec()->read_only_size()); |
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_rw_vs.initialize(rw_rs, spec()->read_write_size()); |
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_md_vs.initialize(md_rs, spec()->misc_data_size()); |
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_mc_vs.initialize(mc_rs, spec()->misc_code_size()); |
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} |
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// Allocate the shared spaces. |
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_ro_bts = new BlockOffsetSharedArray( |
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MemRegion(readonly_bottom, |
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heap_word_size(spec()->read_only_size())), |
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heap_word_size(spec()->read_only_size())); |
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_ro_space = new OffsetTableContigSpace(_ro_bts, |
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MemRegion(readonly_bottom, readonly_end)); |
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_rw_bts = new BlockOffsetSharedArray( |
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MemRegion(readwrite_bottom, |
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heap_word_size(spec()->read_write_size())), |
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heap_word_size(spec()->read_write_size())); |
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_rw_space = new OffsetTableContigSpace(_rw_bts, |
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MemRegion(readwrite_bottom, readwrite_end)); |
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// Restore mangling flag. |
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NOT_PRODUCT(ZapUnusedHeapArea = old_ZapUnusedHeapArea;) |
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if (_ro_space == NULL || _rw_space == NULL) |
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vm_exit_during_initialization("Could not allocate a shared space"); |
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// Cover both shared spaces entirely with cards. |
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_rs->resize_covered_region(MemRegion(readonly_bottom, readwrite_end)); |
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if (UseSharedSpaces) { |
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// Map in the regions in the shared file. |
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FileMapInfo* mapinfo = FileMapInfo::current_info(); |
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size_t image_alignment = mapinfo->alignment(); |
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CollectedHeap* ch = Universe::heap(); |
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if ((!mapinfo->map_space(ro, ro_rs, _ro_space)) || |
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(!mapinfo->map_space(rw, rw_rs, _rw_space)) || |
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(!mapinfo->map_space(md, md_rs, NULL)) || |
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(!mapinfo->map_space(mc, mc_rs, NULL)) || |
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// check the alignment constraints |
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(ch == NULL || ch->kind() != CollectedHeap::GenCollectedHeap || |
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image_alignment != |
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((GenCollectedHeap*)ch)->gen_policy()->max_alignment())) { |
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// Base addresses didn't match; skip sharing, but continue |
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shared_rs.release(); |
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spec()->disable_sharing(); |
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263 |
// If -Xshare:on is specified, print out the error message and exit VM, |
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264 |
// otherwise, set UseSharedSpaces to false and continue. |
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265 |
if (RequireSharedSpaces) { |
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266 |
vm_exit_during_initialization("Unable to use shared archive.", NULL); |
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} else { |
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FLAG_SET_DEFAULT(UseSharedSpaces, false); |
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} |
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271 |
// Note: freeing the block offset array objects does not |
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// currently free up the underlying storage. |
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273 |
delete _ro_bts; |
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274 |
_ro_bts = NULL; |
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275 |
delete _ro_space; |
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_ro_space = NULL; |
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delete _rw_bts; |
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278 |
_rw_bts = NULL; |
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delete _rw_space; |
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_rw_space = NULL; |
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shared_end = (HeapWord*)(rs.base() + rs.size()); |
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282 |
_rs->resize_covered_region(MemRegion(shared_bottom, shared_bottom)); |
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} |
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} |
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285 |
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// Reserved region includes shared spaces for oop.is_in_reserved(). |
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287 |
_reserved.set_end(shared_end); |
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288 |
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289 |
} else { |
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_ro_space = NULL; |
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_rw_space = NULL; |
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} |
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293 |
} |
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294 |
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295 |
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296 |
// Do a complete scan of the shared read write space to catch all |
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297 |
// objects which contain references to any younger generation. Forward |
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298 |
// the pointers. Avoid space_iterate, as actually visiting all the |
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// objects in the space will page in more objects than we need. |
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// Instead, use the system dictionary as strong roots into the read |
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// write space. |
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// |
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// If a RedefineClasses() call has been made, then we have to iterate |
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// over the entire shared read-write space in order to find all the |
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// objects that need to be forwarded. For example, it is possible for |
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// an nmethod to be found and marked in GC phase-1 only for the nmethod |
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// to be freed by the time we reach GC phase-3. The underlying method |
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// is still marked, but we can't (easily) find it in GC phase-3 so we |
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// blow up in GC phase-4. With RedefineClasses() we want replaced code |
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// (EMCP or obsolete) to go away (i.e., be collectible) once it is no |
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// longer being executed by any thread so we keep minimal attachments |
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// to the replaced code. However, we can't guarantee when those EMCP |
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// or obsolete methods will be collected so they may still be out there |
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314 |
// even after we've severed our minimal attachments. |
1 | 315 |
|
316 |
void CompactingPermGenGen::pre_adjust_pointers() { |
|
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if (spec()->enable_shared_spaces()) { |
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if (JvmtiExport::has_redefined_a_class()) { |
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// RedefineClasses() requires a brute force approach |
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AdjustSharedObjectClosure blk; |
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rw_space()->object_iterate(&blk); |
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} else { |
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RecursiveAdjustSharedObjectClosure blk; |
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Universe::oops_do(&blk); |
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StringTable::oops_do(&blk); |
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SystemDictionary::always_strong_classes_do(&blk); |
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SystemDictionary::placeholders_do(TraversePlaceholdersClosure::placeholders_do); |
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} |
1 | 329 |
} |
330 |
} |
|
331 |
||
332 |
||
333 |
#ifdef ASSERT |
|
334 |
class VerifyMarksClearedClosure : public ObjectClosure { |
|
335 |
public: |
|
336 |
void do_object(oop obj) { |
|
337 |
assert(SharedSkipVerify || !obj->mark()->is_marked(), |
|
338 |
"Shared oop still marked?"); |
|
339 |
} |
|
340 |
}; |
|
341 |
#endif |
|
342 |
||
343 |
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344 |
void CompactingPermGenGen::post_compact() { |
|
345 |
#ifdef ASSERT |
|
346 |
if (!SharedSkipVerify && spec()->enable_shared_spaces()) { |
|
347 |
VerifyMarksClearedClosure blk; |
|
348 |
rw_space()->object_iterate(&blk); |
|
349 |
} |
|
350 |
#endif |
|
351 |
} |
|
352 |
||
353 |
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// Do not use in time-critical operations due to the possibility of paging |
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// in otherwise untouched or previously unread portions of the perm gen, |
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// for instance, the shared spaces. NOTE: Because CompactingPermGenGen |
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357 |
// derives from OneContigSpaceCardGeneration which is supposed to have a |
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// single space, and does not override its object_iterate() method, |
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// object iteration via that interface does not look at the objects in |
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360 |
// the shared spaces when using CDS. This should be fixed; see CR 6897798. |
1 | 361 |
void CompactingPermGenGen::space_iterate(SpaceClosure* blk, bool usedOnly) { |
362 |
OneContigSpaceCardGeneration::space_iterate(blk, usedOnly); |
|
363 |
if (spec()->enable_shared_spaces()) { |
|
364 |
// Making the rw_space walkable will page in the entire space, and |
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// is to be avoided in the case of time-critical operations. |
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366 |
// However, this is required for Verify and heap dump operations. |
1 | 367 |
blk->do_space(ro_space()); |
368 |
blk->do_space(rw_space()); |
|
369 |
} |
|
370 |
} |
|
371 |
||
372 |
||
373 |
void CompactingPermGenGen::print_on(outputStream* st) const { |
|
374 |
OneContigSpaceCardGeneration::print_on(st); |
|
375 |
if (spec()->enable_shared_spaces()) { |
|
376 |
st->print(" ro"); |
|
377 |
ro_space()->print_on(st); |
|
378 |
st->print(" rw"); |
|
379 |
rw_space()->print_on(st); |
|
380 |
} else { |
|
381 |
st->print_cr("No shared spaces configured."); |
|
382 |
} |
|
383 |
} |
|
384 |
||
385 |
||
386 |
// References from the perm gen to the younger generation objects may |
|
387 |
// occur in static fields in Java classes or in constant pool references |
|
388 |
// to String objects. |
|
389 |
||
390 |
void CompactingPermGenGen::younger_refs_iterate(OopsInGenClosure* blk) { |
|
391 |
OneContigSpaceCardGeneration::younger_refs_iterate(blk); |
|
392 |
if (spec()->enable_shared_spaces()) { |
|
393 |
blk->set_generation(this); |
|
394 |
// ro_space has no younger gen refs. |
|
395 |
_rs->younger_refs_in_space_iterate(rw_space(), blk); |
|
396 |
blk->reset_generation(); |
|
397 |
} |
|
398 |
} |
|
399 |
||
400 |
||
401 |
// Shared spaces are addressed in pre_adjust_pointers. |
|
402 |
void CompactingPermGenGen::adjust_pointers() { |
|
403 |
the_space()->adjust_pointers(); |
|
404 |
} |
|
405 |
||
406 |
||
407 |
void CompactingPermGenGen::compact() { |
|
408 |
the_space()->compact(); |
|
409 |
} |
|
410 |
||
411 |
||
412 |
size_t CompactingPermGenGen::contiguous_available() const { |
|
413 |
// Don't include shared spaces. |
|
414 |
return OneContigSpaceCardGeneration::contiguous_available() |
|
415 |
- _shared_space_size; |
|
416 |
} |
|
417 |
||
418 |
size_t CompactingPermGenGen::max_capacity() const { |
|
419 |
// Don't include shared spaces. |
|
420 |
assert(UseSharedSpaces || (_shared_space_size == 0), |
|
421 |
"If not used, the size of shared spaces should be 0"); |
|
422 |
return OneContigSpaceCardGeneration::max_capacity() |
|
423 |
- _shared_space_size; |
|
424 |
} |
|
425 |
||
426 |
||
427 |
// No young generation references, clear this generation's main space's |
|
428 |
// card table entries. Do NOT clear the card table entries for the |
|
429 |
// read-only space (always clear) or the read-write space (valuable |
|
430 |
// information). |
|
431 |
||
432 |
void CompactingPermGenGen::clear_remembered_set() { |
|
433 |
_rs->clear(MemRegion(the_space()->bottom(), the_space()->end())); |
|
434 |
} |
|
435 |
||
436 |
||
437 |
// Objects in this generation's main space may have moved, invalidate |
|
438 |
// that space's cards. Do NOT invalidate the card table entries for the |
|
439 |
// read-only or read-write spaces, as those objects never move. |
|
440 |
||
441 |
void CompactingPermGenGen::invalidate_remembered_set() { |
|
442 |
_rs->invalidate(used_region()); |
|
443 |
} |
|
444 |
||
445 |
||
446 |
void CompactingPermGenGen::verify(bool allow_dirty) { |
|
447 |
the_space()->verify(allow_dirty); |
|
448 |
if (!SharedSkipVerify && spec()->enable_shared_spaces()) { |
|
449 |
ro_space()->verify(allow_dirty); |
|
450 |
rw_space()->verify(allow_dirty); |
|
451 |
} |
|
452 |
} |
|
453 |
||
454 |
||
455 |
HeapWord* CompactingPermGenGen::unshared_bottom; |
|
456 |
HeapWord* CompactingPermGenGen::unshared_end; |
|
457 |
HeapWord* CompactingPermGenGen::shared_bottom; |
|
458 |
HeapWord* CompactingPermGenGen::shared_end; |
|
459 |
HeapWord* CompactingPermGenGen::readonly_bottom; |
|
460 |
HeapWord* CompactingPermGenGen::readonly_end; |
|
461 |
HeapWord* CompactingPermGenGen::readwrite_bottom; |
|
462 |
HeapWord* CompactingPermGenGen::readwrite_end; |
|
463 |
HeapWord* CompactingPermGenGen::miscdata_bottom; |
|
464 |
HeapWord* CompactingPermGenGen::miscdata_end; |
|
465 |
HeapWord* CompactingPermGenGen::misccode_bottom; |
|
466 |
HeapWord* CompactingPermGenGen::misccode_end; |
|
467 |
||
468 |
// JVM/TI RedefineClasses() support: |
|
469 |
bool CompactingPermGenGen::remap_shared_readonly_as_readwrite() { |
|
470 |
assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
|
471 |
||
472 |
if (UseSharedSpaces) { |
|
473 |
// remap the shared readonly space to shared readwrite, private |
|
474 |
FileMapInfo* mapinfo = FileMapInfo::current_info(); |
|
475 |
if (!mapinfo->remap_shared_readonly_as_readwrite()) { |
|
476 |
return false; |
|
477 |
} |
|
478 |
} |
|
479 |
return true; |
|
480 |
} |