1 /* 2 * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_SHARED_GCCAUSE_HPP 26 #define SHARE_VM_GC_SHARED_GCCAUSE_HPP 27 28 #include "memory/allocation.hpp" 29 30 // 31 // This class exposes implementation details of the various 32 // collector(s), and we need to be very careful with it. If 33 // use of this class grows, we should split it into public 34 // and implementation-private "causes". 35 // 36 // The definitions in the SA code should be kept in sync 37 // with the definitions here. 38 // 39 40 class GCCause : public AllStatic { 41 public: 42 enum Cause { 43 /* public */ 44 _java_lang_system_gc, 45 _full_gc_alot, 46 _scavenge_alot, 47 _allocation_profiler, 48 _jvmti_force_gc, 49 _gc_locker, 50 _heap_inspection, 51 _heap_dump, 52 _wb_young_gc, 53 _wb_conc_mark, 54 _wb_full_gc, 55 56 /* implementation independent, but reserved for GC use */ 57 _no_gc, 58 _no_cause_specified, 59 _allocation_failure, 60 61 /* implementation specific */ 62 63 _tenured_generation_full, 64 _metadata_GC_threshold, 65 _metadata_GC_clear_soft_refs, 66 67 _cms_generation_full, 68 _cms_initial_mark, 69 _cms_final_remark, 70 _cms_concurrent_mark, 71 72 _old_generation_expanded_on_last_scavenge, 73 _old_generation_too_full_to_scavenge, 74 _adaptive_size_policy, 75 76 _g1_inc_collection_pause, 77 _g1_humongous_allocation, 78 79 _dcmd_gc_run, 80 81 _last_gc_cause 82 }; 83 84 inline static bool is_user_requested_gc(GCCause::Cause cause) { 85 return (cause == GCCause::_java_lang_system_gc || 86 cause == GCCause::_dcmd_gc_run); 87 } 88 89 inline static bool is_serviceability_requested_gc(GCCause::Cause 90 cause) { 91 return (cause == GCCause::_jvmti_force_gc || 92 cause == GCCause::_heap_inspection || 93 cause == GCCause::_heap_dump); 94 } 95 96 // Causes for collection of the tenured gernation 97 inline static bool is_tenured_allocation_failure_gc(GCCause::Cause cause) { 98 assert(cause != GCCause::_old_generation_too_full_to_scavenge && 99 cause != GCCause::_old_generation_expanded_on_last_scavenge, 100 "This GCCause may be correct but is not expected yet: %s", 101 to_string(cause)); 102 // _tenured_generation_full or _cms_generation_full for full tenured generations 103 // _adaptive_size_policy for a full collection after a young GC 104 // _allocation_failure is the generic cause a collection which could result 105 // in the collection of the tenured generation if there is not enough space 106 // in the tenured generation to support a young GC. 107 return (cause == GCCause::_tenured_generation_full || 108 cause == GCCause::_cms_generation_full || 109 cause == GCCause::_adaptive_size_policy || 110 cause == GCCause::_allocation_failure); 111 } 112 113 // Causes for collection of the young generation 114 inline static bool is_allocation_failure_gc(GCCause::Cause cause) { 115 // _allocation_failure is the generic cause a collection for allocation failure 116 // _adaptive_size_policy is for a collecton done before a full GC 117 return (cause == GCCause::_allocation_failure || 118 cause == GCCause::_adaptive_size_policy); 119 } 120 121 // Return a string describing the GCCause. 122 static const char* to_string(GCCause::Cause cause); 123 }; 124 125 #endif // SHARE_VM_GC_SHARED_GCCAUSE_HPP