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ASSEMBLY_EXCEPTION@00b023ae2d78 (annotated)
ASSEMBLY_EXCEPTION
Thu, 20 Nov 2008 12:27:41 -0800
- author
- ysr
- date
- Thu, 20 Nov 2008 12:27:41 -0800
- changeset 887
- 00b023ae2d78
- parent 435
- a61af66fc99e
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
Summary: When we encounter marking stack overflow during precleaning of Reference lists, we were using the overflow list mechanism, which can cause problems on account of mutating the mark word of the header because of conflicts with mutator accesses and updates of that field. Instead we should use the usual mechanism for overflow handling in concurrent phases, namely dirtying of the card on which the overflowed object lies. Since precleaning effectively does a form of discovered list processing, albeit with discovery enabled, we needed to adjust some code to be correct in the face of interleaved processing and discovery.
Reviewed-by: apetrusenko, jcoomes
| duke@435 | 1 | |
| duke@435 | 2 | OPENJDK ASSEMBLY EXCEPTION |
| duke@435 | 3 | |
| duke@435 | 4 | The OpenJDK source code made available by Sun at openjdk.java.net and |
| duke@435 | 5 | openjdk.dev.java.net ("OpenJDK Code") is distributed under the terms of the |
| duke@435 | 6 | GNU General Public License <http://www.gnu.org/copyleft/gpl.html> version 2 |
| duke@435 | 7 | only ("GPL2"), with the following clarification and special exception. |
| duke@435 | 8 | |
| duke@435 | 9 | Linking this OpenJDK Code statically or dynamically with other code |
| duke@435 | 10 | is making a combined work based on this library. Thus, the terms |
| duke@435 | 11 | and conditions of GPL2 cover the whole combination. |
| duke@435 | 12 | |
| duke@435 | 13 | As a special exception, Sun gives you permission to link this |
| duke@435 | 14 | OpenJDK Code with certain code licensed by Sun as indicated at |
| duke@435 | 15 | http://openjdk.java.net/legal/exception-modules-2007-05-08.html |
| duke@435 | 16 | ("Designated Exception Modules") to produce an executable, |
| duke@435 | 17 | regardless of the license terms of the Designated Exception Modules, |
| duke@435 | 18 | and to copy and distribute the resulting executable under GPL2, |
| duke@435 | 19 | provided that the Designated Exception Modules continue to be |
| duke@435 | 20 | governed by the licenses under which they were offered by Sun. |
| duke@435 | 21 | |
| duke@435 | 22 | As such, it allows licensees and sublicensees of Sun's GPL2 OpenJDK Code to |
| duke@435 | 23 | build an executable that includes those portions of necessary code that Sun |
| duke@435 | 24 | could not provide under GPL2 (or that Sun has provided under GPL2 with the |
| duke@435 | 25 | Classpath exception). If you modify or add to the OpenJDK code, that new |
| duke@435 | 26 | GPL2 code may still be combined with Designated Exception Modules if the |
| duke@435 | 27 | new code is made subject to this exception by its copyright holder. |
