1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/shared/vmGCOperations.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,237 @@
1.4 +/*
1.5 + * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
1.30 +
1.31 +#include "memory/heapInspection.hpp"
1.32 +#include "runtime/handles.hpp"
1.33 +#include "runtime/jniHandles.hpp"
1.34 +#include "runtime/synchronizer.hpp"
1.35 +#include "runtime/vm_operations.hpp"
1.36 +#include "prims/jvmtiExport.hpp"
1.37 +
1.38 +// The following class hierarchy represents
1.39 +// a set of operations (VM_Operation) related to GC.
1.40 +//
1.41 +// VM_Operation
1.42 +// VM_GC_Operation
1.43 +// VM_GC_HeapInspection
1.44 +// VM_GenCollectForAllocation
1.45 +// VM_GenCollectFull
1.46 +// VM_GenCollectFullConcurrent
1.47 +// VM_ParallelGCFailedAllocation
1.48 +// VM_ParallelGCSystemGC
1.49 +// VM_GC_Operation
1.50 +// - implements methods common to all classes in the hierarchy:
1.51 +// prevents multiple gc requests and manages lock on heap;
1.52 +//
1.53 +// VM_GC_HeapInspection
1.54 +// - prints class histogram on SIGBREAK if PrintClassHistogram
1.55 +// is specified; and also the attach "inspectheap" operation
1.56 +//
1.57 +// VM_GenCollectForAllocation
1.58 +// VM_ParallelGCFailedAllocation
1.59 +// - this operation is invoked when allocation is failed;
1.60 +// operation performs garbage collection and tries to
1.61 +// allocate afterwards;
1.62 +//
1.63 +// VM_GenCollectFull
1.64 +// VM_GenCollectFullConcurrent
1.65 +// VM_ParallelGCSystemGC
1.66 +// - these operations preform full collection of heaps of
1.67 +// different kind
1.68 +//
1.69 +
1.70 +class VM_GC_Operation: public VM_Operation {
1.71 + protected:
1.72 + BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL)
1.73 + unsigned int _gc_count_before; // gc count before acquiring PLL
1.74 + unsigned int _full_gc_count_before; // full gc count before acquiring PLL
1.75 + bool _full; // whether a "full" collection
1.76 + bool _prologue_succeeded; // whether doit_prologue succeeded
1.77 + GCCause::Cause _gc_cause; // the putative cause for this gc op
1.78 + bool _gc_locked; // will be set if gc was locked
1.79 +
1.80 + virtual bool skip_operation() const;
1.81 +
1.82 + // java.lang.ref.Reference support
1.83 + void acquire_pending_list_lock();
1.84 + void release_and_notify_pending_list_lock();
1.85 +
1.86 + public:
1.87 + VM_GC_Operation(unsigned int gc_count_before,
1.88 + GCCause::Cause _cause,
1.89 + unsigned int full_gc_count_before = 0,
1.90 + bool full = false) {
1.91 + _full = full;
1.92 + _prologue_succeeded = false;
1.93 + _gc_count_before = gc_count_before;
1.94 +
1.95 + // A subclass constructor will likely overwrite the following
1.96 + _gc_cause = _cause;
1.97 +
1.98 + _gc_locked = false;
1.99 +
1.100 + _full_gc_count_before = full_gc_count_before;
1.101 + // In ParallelScavengeHeap::mem_allocate() collections can be
1.102 + // executed within a loop and _all_soft_refs_clear can be set
1.103 + // true after they have been cleared by a collection and another
1.104 + // collection started so that _all_soft_refs_clear can be true
1.105 + // when this collection is started. Don't assert that
1.106 + // _all_soft_refs_clear have to be false here even though
1.107 + // mutators have run. Soft refs will be cleared again in this
1.108 + // collection.
1.109 + }
1.110 + ~VM_GC_Operation() {
1.111 + CollectedHeap* ch = Universe::heap();
1.112 + ch->collector_policy()->set_all_soft_refs_clear(false);
1.113 + }
1.114 +
1.115 + // Acquire the reference synchronization lock
1.116 + virtual bool doit_prologue();
1.117 + // Do notifyAll (if needed) and release held lock
1.118 + virtual void doit_epilogue();
1.119 +
1.120 + virtual bool allow_nested_vm_operations() const { return true; }
1.121 + bool prologue_succeeded() const { return _prologue_succeeded; }
1.122 +
1.123 + void set_gc_locked() { _gc_locked = true; }
1.124 + bool gc_locked() const { return _gc_locked; }
1.125 +
1.126 + static void notify_gc_begin(bool full = false);
1.127 + static void notify_gc_end();
1.128 +};
1.129 +
1.130 +
1.131 +class VM_GC_HeapInspection: public VM_GC_Operation {
1.132 + private:
1.133 + outputStream* _out;
1.134 + bool _full_gc;
1.135 + bool _csv_format; // "comma separated values" format for spreadsheet.
1.136 + bool _print_help;
1.137 + bool _print_class_stats;
1.138 + const char* _columns;
1.139 + public:
1.140 + VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
1.141 + VM_GC_Operation(0 /* total collections, dummy, ignored */,
1.142 + GCCause::_heap_inspection /* GC Cause */,
1.143 + 0 /* total full collections, dummy, ignored */,
1.144 + request_full_gc) {
1.145 + _out = out;
1.146 + _full_gc = request_full_gc;
1.147 + _csv_format = false;
1.148 + _print_help = false;
1.149 + _print_class_stats = false;
1.150 + _columns = NULL;
1.151 + }
1.152 +
1.153 + ~VM_GC_HeapInspection() {}
1.154 + virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }
1.155 + virtual bool skip_operation() const;
1.156 + virtual bool doit_prologue();
1.157 + virtual void doit();
1.158 + void set_csv_format(bool value) {_csv_format = value;}
1.159 + void set_print_help(bool value) {_print_help = value;}
1.160 + void set_print_class_stats(bool value) {_print_class_stats = value;}
1.161 + void set_columns(const char* value) {_columns = value;}
1.162 + protected:
1.163 + bool collect();
1.164 +};
1.165 +
1.166 +
1.167 +class VM_GenCollectForAllocation: public VM_GC_Operation {
1.168 + private:
1.169 + HeapWord* _res;
1.170 + size_t _size; // size of object to be allocated.
1.171 + bool _tlab; // alloc is of a tlab.
1.172 + public:
1.173 + VM_GenCollectForAllocation(size_t size,
1.174 + bool tlab,
1.175 + unsigned int gc_count_before)
1.176 + : VM_GC_Operation(gc_count_before, GCCause::_allocation_failure),
1.177 + _size(size),
1.178 + _tlab(tlab) {
1.179 + _res = NULL;
1.180 + }
1.181 + ~VM_GenCollectForAllocation() {}
1.182 + virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; }
1.183 + virtual void doit();
1.184 + HeapWord* result() const { return _res; }
1.185 +};
1.186 +
1.187 +
1.188 +// VM operation to invoke a collection of the heap as a
1.189 +// GenCollectedHeap heap.
1.190 +class VM_GenCollectFull: public VM_GC_Operation {
1.191 + private:
1.192 + int _max_level;
1.193 + public:
1.194 + VM_GenCollectFull(unsigned int gc_count_before,
1.195 + unsigned int full_gc_count_before,
1.196 + GCCause::Cause gc_cause,
1.197 + int max_level)
1.198 + : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */),
1.199 + _max_level(max_level) { }
1.200 + ~VM_GenCollectFull() {}
1.201 + virtual VMOp_Type type() const { return VMOp_GenCollectFull; }
1.202 + virtual void doit();
1.203 +};
1.204 +
1.205 +class VM_CollectForMetadataAllocation: public VM_GC_Operation {
1.206 + private:
1.207 + MetaWord* _result;
1.208 + size_t _size; // size of object to be allocated
1.209 + Metaspace::MetadataType _mdtype;
1.210 + ClassLoaderData* _loader_data;
1.211 + public:
1.212 + VM_CollectForMetadataAllocation(ClassLoaderData* loader_data,
1.213 + size_t size, Metaspace::MetadataType mdtype,
1.214 + unsigned int gc_count_before,
1.215 + unsigned int full_gc_count_before,
1.216 + GCCause::Cause gc_cause)
1.217 + : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true),
1.218 + _loader_data(loader_data), _size(size), _mdtype(mdtype), _result(NULL) {
1.219 + }
1.220 + virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; }
1.221 + virtual void doit();
1.222 + MetaWord* result() const { return _result; }
1.223 +};
1.224 +
1.225 +class SvcGCMarker : public StackObj {
1.226 + private:
1.227 + JvmtiGCMarker _jgcm;
1.228 + public:
1.229 + typedef enum { MINOR, FULL, OTHER } reason_type;
1.230 +
1.231 + SvcGCMarker(reason_type reason ) {
1.232 + VM_GC_Operation::notify_gc_begin(reason == FULL);
1.233 + }
1.234 +
1.235 + ~SvcGCMarker() {
1.236 + VM_GC_Operation::notify_gc_end();
1.237 + }
1.238 +};
1.239 +
1.240 +#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP
