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annotate ASSEMBLY_EXCEPTION @ 1886:72a161e62cc4

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6991377: G1: race between concurrent refinement and humongous object allocation Summary: There is a race between the concurrent refinement threads and the humongous object allocation that can cause the concurrent refinement threads to corrupt the part of the BOT that it is being initialized by the humongous object allocation operation. The solution is to do the humongous object allocation in careful steps to ensure that the concurrent refinement threads always have a consistent view over the BOT, region contents, and top. The fix includes some very minor tidying up in sparsePRT. Reviewed-by: jcoomes, johnc, ysr
author tonyp
date Sat, 16 Oct 2010 17:12:19 -0400
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2 OPENJDK ASSEMBLY EXCEPTION
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4 The OpenJDK source code made available by Oracle at openjdk.java.net and
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5 openjdk.dev.java.net ("OpenJDK Code") is distributed under the terms of the
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6 GNU General Public License <http://www.gnu.org/copyleft/gpl.html> version 2
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7 only ("GPL2"), with the following clarification and special exception.
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9 Linking this OpenJDK Code statically or dynamically with other code
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10 is making a combined work based on this library. Thus, the terms
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11 and conditions of GPL2 cover the whole combination.
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13 As a special exception, Oracle gives you permission to link this
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14 OpenJDK Code with certain code licensed by Oracle as indicated at
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15 http://openjdk.java.net/legal/exception-modules-2007-05-08.html
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16 ("Designated Exception Modules") to produce an executable,
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17 regardless of the license terms of the Designated Exception Modules,
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18 and to copy and distribute the resulting executable under GPL2,
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19 provided that the Designated Exception Modules continue to be
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20 governed by the licenses under which they were offered by Oracle.
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22 As such, it allows licensees and sublicensees of Oracle's GPL2 OpenJDK Code to
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23 build an executable that includes those portions of necessary code that Oracle
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24 could not provide under GPL2 (or that Oracle has provided under GPL2 with the
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25 Classpath exception). If you modify or add to the OpenJDK code, that new
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26 GPL2 code may still be combined with Designated Exception Modules if the
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27 new code is made subject to this exception by its copyright holder.