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src/share/vm/gc_implementation/parallelScavenge/vmPSOperations.cpp@9f28a4cac6d9 (annotated)

src/share/vm/gc_implementation/parallelScavenge/vmPSOperations.cpp

Wed, 31 Jul 2019 14:28:51 -0400

author

kbarrett

date

Wed, 31 Jul 2019 14:28:51 -0400

changeset 9787

9f28a4cac6d9

parent 7687

af8f16ac392c

child 9806

758c07667682

permissions

-rw-r--r--

8048556: Unnecessary GCLocker-initiated young GCs
Summary: Fixed recognition of unnecessary GCLocker collections.
Reviewed-by: pliden, tschatzl
Contributed-by: johnc@azul.com

duke@435	1	/*
mlarsson@7686	2	* Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
stefank@2314	27	#include "gc_implementation/parallelScavenge/psMarkSweep.hpp"
stefank@2314	28	#include "gc_implementation/parallelScavenge/psScavenge.hpp"
stefank@2314	29	#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
stefank@2314	30	#include "gc_implementation/parallelScavenge/vmPSOperations.hpp"
stefank@2314	31	#include "memory/gcLocker.inline.hpp"
stefank@2314	32	#include "utilities/dtrace.hpp"
duke@435	33
duke@435	34	// The following methods are used by the parallel scavenge collector
mlarsson@7687	35	VM_ParallelGCFailedAllocation::VM_ParallelGCFailedAllocation(size_t word_size,
mlarsson@7686	36	uint gc_count) :
mlarsson@7687	37	VM_CollectForAllocation(word_size, gc_count, GCCause::_allocation_failure) {
mlarsson@7687	38	assert(word_size != 0, "An allocation should always be requested with this operation.");
duke@435	39	}
duke@435	40
duke@435	41	void VM_ParallelGCFailedAllocation::doit() {
kamg@2445	42	SvcGCMarker sgcm(SvcGCMarker::MINOR);
duke@435	43
duke@435	44	ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435	45	assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "must be a ParallelScavengeHeap");
duke@435	46
duke@435	47	GCCauseSetter gccs(heap, _gc_cause);
mlarsson@7687	48	_result = heap->failed_mem_allocate(_word_size);
duke@435	49
duke@435	50	if (_result == NULL && GC_locker::is_active_and_needs_gc()) {
duke@435	51	set_gc_locked();
duke@435	52	}
duke@435	53	}
duke@435	54
kbarrett@9787	55	static bool is_cause_full(GCCause::Cause cause) {
kbarrett@9787	56	return (cause != GCCause::_gc_locker) && (cause != GCCause::_wb_young_gc)
kbarrett@9787	57	DEBUG_ONLY(&& (cause != GCCause::_scavenge_alot));
kbarrett@9787	58	}
kbarrett@9787	59
duke@435	60	// Only used for System.gc() calls
mlarsson@7686	61	VM_ParallelGCSystemGC::VM_ParallelGCSystemGC(uint gc_count,
mlarsson@7686	62	uint full_gc_count,
duke@435	63	GCCause::Cause gc_cause) :
kbarrett@9787	64	VM_GC_Operation(gc_count, gc_cause, full_gc_count, is_cause_full(gc_cause))
duke@435	65	{
duke@435	66	}
duke@435	67
duke@435	68	void VM_ParallelGCSystemGC::doit() {
kamg@2445	69	SvcGCMarker sgcm(SvcGCMarker::FULL);
duke@435	70
duke@435	71	ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435	72	assert(heap->kind() == CollectedHeap::ParallelScavengeHeap,
duke@435	73	"must be a ParallelScavengeHeap");
duke@435	74
duke@435	75	GCCauseSetter gccs(heap, _gc_cause);
kbarrett@9787	76	if (!_full) {
duke@435	77	// If (and only if) the scavenge fails, this will invoke a full gc.
duke@435	78	heap->invoke_scavenge();
duke@435	79	} else {
coleenp@4037	80	heap->do_full_collection(false);
duke@435	81	}
duke@435	82	}