126 lines
4.2 KiB
C++
126 lines
4.2 KiB
C++
/*
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* Copyright (c) 2002, 2015, 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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#ifndef SHARE_VM_GC_SHARED_GCCAUSE_HPP
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#define SHARE_VM_GC_SHARED_GCCAUSE_HPP
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#include "memory/allocation.hpp"
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//
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// This class exposes implementation details of the various
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// collector(s), and we need to be very careful with it. If
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// use of this class grows, we should split it into public
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// and implementation-private "causes".
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//
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// The definitions in the SA code should be kept in sync
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// with the definitions here.
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//
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class GCCause : public AllStatic {
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public:
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enum Cause {
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/* public */
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_java_lang_system_gc,
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_full_gc_alot,
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_scavenge_alot,
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_allocation_profiler,
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_jvmti_force_gc,
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_gc_locker,
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_heap_inspection,
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_heap_dump,
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_wb_young_gc,
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_wb_conc_mark,
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_wb_full_gc,
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/* implementation independent, but reserved for GC use */
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_no_gc,
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_no_cause_specified,
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_allocation_failure,
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/* implementation specific */
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_tenured_generation_full,
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_metadata_GC_threshold,
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_metadata_GC_clear_soft_refs,
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_cms_generation_full,
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_cms_initial_mark,
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_cms_final_remark,
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_cms_concurrent_mark,
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_old_generation_expanded_on_last_scavenge,
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_old_generation_too_full_to_scavenge,
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_adaptive_size_policy,
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_g1_inc_collection_pause,
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_g1_humongous_allocation,
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_dcmd_gc_run,
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_last_gc_cause
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};
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inline static bool is_user_requested_gc(GCCause::Cause cause) {
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return (cause == GCCause::_java_lang_system_gc ||
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cause == GCCause::_dcmd_gc_run);
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}
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inline static bool is_serviceability_requested_gc(GCCause::Cause
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cause) {
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return (cause == GCCause::_jvmti_force_gc ||
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cause == GCCause::_heap_inspection ||
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cause == GCCause::_heap_dump);
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}
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// Causes for collection of the tenured gernation
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inline static bool is_tenured_allocation_failure_gc(GCCause::Cause cause) {
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assert(cause != GCCause::_old_generation_too_full_to_scavenge &&
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cause != GCCause::_old_generation_expanded_on_last_scavenge,
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"This GCCause may be correct but is not expected yet: %s",
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to_string(cause));
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// _tenured_generation_full or _cms_generation_full for full tenured generations
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// _adaptive_size_policy for a full collection after a young GC
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// _allocation_failure is the generic cause a collection which could result
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// in the collection of the tenured generation if there is not enough space
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// in the tenured generation to support a young GC.
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return (cause == GCCause::_tenured_generation_full ||
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cause == GCCause::_cms_generation_full ||
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cause == GCCause::_adaptive_size_policy ||
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cause == GCCause::_allocation_failure);
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}
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// Causes for collection of the young generation
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inline static bool is_allocation_failure_gc(GCCause::Cause cause) {
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// _allocation_failure is the generic cause a collection for allocation failure
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// _adaptive_size_policy is for a collecton done before a full GC
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return (cause == GCCause::_allocation_failure ||
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cause == GCCause::_adaptive_size_policy);
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}
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// Return a string describing the GCCause.
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static const char* to_string(GCCause::Cause cause);
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};
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#endif // SHARE_VM_GC_SHARED_GCCAUSE_HPP
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