Mercurial > hg > truffle
annotate ASSEMBLY_EXCEPTION @ 3766:c3f1170908be
7045330: G1: Simplify/fix the HeapRegionSeq class
7042285: G1: native memory leak during humongous object allocation
6804436: G1: heap region indices should be size_t
Summary: A series of fixes and improvements to the HeapRegionSeq class: a) replace the _regions growable array with a standard C array, b) avoid de-allocating / re-allocating HeapRegion instances when the heap shrinks / grows (fix for 7042285), c) introduce fast method to map address to HeapRegion via a "biased" array pointer, d) embed the _hrs object in G1CollectedHeap, instead of pointing to it via an indirection, e) assume that all the regions added to the HeapRegionSeq instance are contiguous, f) replace int's with size_t's for indexes (and expand that to HeapRegion as part of 6804436), g) remove unnecessary / unused methods, h) rename a couple of fields (_alloc_search_start and _seq_bottom), i) fix iterate_from() not to always start from index 0 irrespective of the region passed to it, j) add a verification method to check the HeapRegionSeq assumptions, k) always call the wrappers for _hrs.iterate(), _hrs_length(), and _hrs.at() from G1CollectedHeap, not those methods directly, and l) unify the code that expands the sequence (by either re-using or creating a new HeapRegion) and make it robust wrt to a HeapRegion allocation failing.
Reviewed-by: stefank, johnc, brutisso
author | tonyp |
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date | Fri, 10 Jun 2011 13:16:40 -0400 |
parents | c18cbe5936b8 |
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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 |
0 | 5 openjdk.dev.java.net ("OpenJDK Code") is distributed under the terms of the |
6 GNU General Public License <http://www.gnu.org/copyleft/gpl.html> version 2 | |
7 only ("GPL2"), with the following clarification and special exception. | |
8 | |
9 Linking this OpenJDK Code statically or dynamically with other code | |
10 is making a combined work based on this library. Thus, the terms | |
11 and conditions of GPL2 cover the whole combination. | |
12 | |
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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 |
0 | 15 http://openjdk.java.net/legal/exception-modules-2007-05-08.html |
16 ("Designated Exception Modules") to produce an executable, | |
17 regardless of the license terms of the Designated Exception Modules, | |
18 and to copy and distribute the resulting executable under GPL2, | |
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. |
0 | 21 |
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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 |
0 | 25 Classpath exception). If you modify or add to the OpenJDK code, that new |
26 GPL2 code may still be combined with Designated Exception Modules if the | |
27 new code is made subject to this exception by its copyright holder. |