Mercurial > hg > graal-compiler
view src/share/vm/memory/heapInspection.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
line wrap: on
line source
/* * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_MEMORY_HEAPINSPECTION_HPP #define SHARE_VM_MEMORY_HEAPINSPECTION_HPP #include "memory/allocation.inline.hpp" #include "oops/oop.inline.hpp" #ifndef SERVICES_KERNEL // HeapInspection // KlassInfoTable is a bucket hash table that // maps klassOops to extra information: // instance count and instance word size. // // A KlassInfoBucket is the head of a link list // of KlassInfoEntry's // // KlassInfoHisto is a growable array of pointers // to KlassInfoEntry's and is used to sort // the entries. class KlassInfoEntry: public CHeapObj { private: KlassInfoEntry* _next; klassOop _klass; long _instance_count; size_t _instance_words; public: KlassInfoEntry(klassOop k, KlassInfoEntry* next) : _klass(k), _instance_count(0), _instance_words(0), _next(next) {} KlassInfoEntry* next() { return _next; } bool is_equal(klassOop k) { return k == _klass; } klassOop klass() { return _klass; } long count() { return _instance_count; } void set_count(long ct) { _instance_count = ct; } size_t words() { return _instance_words; } void set_words(size_t wds) { _instance_words = wds; } int compare(KlassInfoEntry* e1, KlassInfoEntry* e2); void print_on(outputStream* st) const; }; class KlassInfoClosure: public StackObj { public: // Called for each KlassInfoEntry. virtual void do_cinfo(KlassInfoEntry* cie) = 0; }; class KlassInfoBucket: public CHeapObj { private: KlassInfoEntry* _list; KlassInfoEntry* list() { return _list; } void set_list(KlassInfoEntry* l) { _list = l; } public: KlassInfoEntry* lookup(const klassOop k); void initialize() { _list = NULL; } void empty(); void iterate(KlassInfoClosure* cic); }; class KlassInfoTable: public StackObj { private: int _size; // An aligned reference address (typically the least // address in the perm gen) used for hashing klass // objects. HeapWord* _ref; KlassInfoBucket* _buckets; uint hash(klassOop p); KlassInfoEntry* lookup(const klassOop k); public: // Table size enum { cit_size = 20011 }; KlassInfoTable(int size, HeapWord* ref); ~KlassInfoTable(); bool record_instance(const oop obj); void iterate(KlassInfoClosure* cic); bool allocation_failed() { return _buckets == NULL; } }; class KlassInfoHisto : public StackObj { private: GrowableArray<KlassInfoEntry*>* _elements; GrowableArray<KlassInfoEntry*>* elements() const { return _elements; } const char* _title; const char* title() const { return _title; } static int sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2); void print_elements(outputStream* st) const; public: enum { histo_initial_size = 1000 }; KlassInfoHisto(const char* title, int estimatedCount); ~KlassInfoHisto(); void add(KlassInfoEntry* cie); void print_on(outputStream* st) const; void sort(); }; #endif // SERVICES_KERNEL class HeapInspection : public AllStatic { public: static void heap_inspection(outputStream* st, bool need_prologue) KERNEL_RETURN; static void find_instances_at_safepoint(klassOop k, GrowableArray<oop>* result) KERNEL_RETURN; }; #endif // SHARE_VM_MEMORY_HEAPINSPECTION_HPP