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src/share/vm/gc_implementation/g1/g1ErgoVerbose.cpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1ErgoVerbose.cpp

Fri, 10 Oct 2014 15:51:58 +0200

author

tschatzl

date

Fri, 10 Oct 2014 15:51:58 +0200

changeset 7257

e7d0505c8a30

parent 3337

41406797186b

child 6876

710a3c8b516e

permissions

-rw-r--r--

8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso

tonyp@3114	1	/*
tonyp@3114	2	* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
tonyp@3114	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
tonyp@3114	4	*
tonyp@3114	5	* This code is free software; you can redistribute it and/or modify it
tonyp@3114	6	* under the terms of the GNU General Public License version 2 only, as
tonyp@3114	7	* published by the Free Software Foundation.
tonyp@3114	8	*
tonyp@3114	9	* This code is distributed in the hope that it will be useful, but WITHOUT
tonyp@3114	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
tonyp@3114	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
tonyp@3114	12	* version 2 for more details (a copy is included in the LICENSE file that
tonyp@3114	13	* accompanied this code).
tonyp@3114	14	*
tonyp@3114	15	* You should have received a copy of the GNU General Public License version
tonyp@3114	16	* 2 along with this work; if not, write to the Free Software Foundation,
tonyp@3114	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
tonyp@3114	18	*
tonyp@3114	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
tonyp@3114	20	* or visit www.oracle.com if you need additional information or have any
tonyp@3114	21	* questions.
tonyp@3114	22	*
tonyp@3114	23	*/
tonyp@3114	24
tonyp@3114	25	#include "precompiled.hpp"
tonyp@3114	26	#include "gc_implementation/g1/g1ErgoVerbose.hpp"
tonyp@3114	27	#include "utilities/ostream.hpp"
tonyp@3114	28
tonyp@3114	29	ErgoLevel G1ErgoVerbose::_level;
tonyp@3114	30	bool G1ErgoVerbose::_enabled[ErgoHeuristicNum];
tonyp@3114	31
tonyp@3114	32	void G1ErgoVerbose::initialize() {
tonyp@3114	33	set_level(ErgoLow);
tonyp@3114	34	set_enabled(false);
tonyp@3114	35	}
tonyp@3114	36
tonyp@3114	37	void G1ErgoVerbose::set_level(ErgoLevel level) {
tonyp@3114	38	_level = level;
tonyp@3114	39	}
tonyp@3114	40
tonyp@3114	41	void G1ErgoVerbose::set_enabled(ErgoHeuristic n, bool enabled) {
tonyp@3114	42	assert(0 <= n && n < ErgoHeuristicNum, "pre-condition");
tonyp@3114	43	_enabled[n] = enabled;
tonyp@3114	44	}
tonyp@3114	45
tonyp@3114	46	void G1ErgoVerbose::set_enabled(bool enabled) {
tonyp@3114	47	for (int n = 0; n < ErgoHeuristicNum; n += 1) {
tonyp@3114	48	set_enabled((ErgoHeuristic) n, enabled);
tonyp@3114	49	}
tonyp@3114	50	}
tonyp@3114	51
tonyp@3114	52	const char* G1ErgoVerbose::to_string(int tag) {
tonyp@3114	53	ErgoHeuristic n = extract_heuristic(tag);
tonyp@3114	54	switch (n) {
tonyp@3337	55	case ErgoHeapSizing: return "Heap Sizing";
tonyp@3337	56	case ErgoCSetConstruction: return "CSet Construction";
tonyp@3337	57	case ErgoConcCycles: return "Concurrent Cycles";
tonyp@3337	58	case ErgoMixedGCs: return "Mixed GCs";
tonyp@3114	59	default:
tonyp@3114	60	ShouldNotReachHere();
tonyp@3114	61	// Keep the Windows compiler happy
tonyp@3114	62	return NULL;
tonyp@3114	63	}
tonyp@3114	64	}