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src/share/vm/memory/barrierSet.cpp@4c84d351cca9 (annotated)

src/share/vm/memory/barrierSet.cpp

Fri, 16 Aug 2013 13:22:32 +0200

author

stefank

date

Fri, 16 Aug 2013 13:22:32 +0200

changeset 5578

4c84d351cca9

parent 2708

1d1603768966

child 6876

710a3c8b516e

permissions

-rw-r--r--

8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso

ysr@777	1	/*
trims@2708	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
ysr@777	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ysr@777	4	*
ysr@777	5	* This code is free software; you can redistribute it and/or modify it
ysr@777	6	* under the terms of the GNU General Public License version 2 only, as
ysr@777	7	* published by the Free Software Foundation.
ysr@777	8	*
ysr@777	9	* This code is distributed in the hope that it will be useful, but WITHOUT
ysr@777	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ysr@777	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
ysr@777	12	* version 2 for more details (a copy is included in the LICENSE file that
ysr@777	13	* accompanied this code).
ysr@777	14	*
ysr@777	15	* You should have received a copy of the GNU General Public License version
ysr@777	16	* 2 along with this work; if not, write to the Free Software Foundation,
ysr@777	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ysr@777	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.
ysr@777	22	*
ysr@777	23	*/
ysr@777	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "gc_interface/collectedHeap.hpp"
stefank@2314	27	#include "memory/barrierSet.inline.hpp"
stefank@2314	28	#include "memory/universe.hpp"
ysr@777	29
ysr@1280	30	// count is number of array elements being written
ysr@777	31	void BarrierSet::static_write_ref_array_pre(HeapWord* start, size_t count) {
ysr@1280	32	assert(count <= (size_t)max_intx, "count too large");
ysr@1280	33	#if 0
ysr@1280	34	warning("Pre: \t" INTPTR_FORMAT "[" SIZE_FORMAT "]\t",
ysr@1280	35	start, count);
ysr@1280	36	#endif
ysr@1280	37	if (UseCompressedOops) {
iveresov@2606	38	Universe::heap()->barrier_set()->write_ref_array_pre((narrowOop*)start, (int)count, false);
ysr@1280	39	} else {
iveresov@2606	40	Universe::heap()->barrier_set()->write_ref_array_pre( (oop*)start, (int)count, false);
ysr@1280	41	}
ysr@777	42	}
ysr@777	43
ysr@1280	44	// count is number of array elements being written
ysr@777	45	void BarrierSet::static_write_ref_array_post(HeapWord* start, size_t count) {
ysr@1526	46	// simply delegate to instance method
ysr@1526	47	Universe::heap()->barrier_set()->write_ref_array(start, count);
ysr@777	48	}