ASSEMBLY_EXCEPTION

Wed, 16 Mar 2011 10:37:08 -0700

author
ysr
date
Wed, 16 Mar 2011 10:37:08 -0700
changeset 2650
dde920245681
parent 1907
c18cbe5936b8
child 6876
710a3c8b516e
child 8636
f973811078b9
permissions
-rw-r--r--

6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam

     2 OPENJDK ASSEMBLY EXCEPTION
     4 The OpenJDK source code made available by Oracle at openjdk.java.net and
     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.
     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.
    13     As a special exception, Oracle gives you permission to link this
    14     OpenJDK Code with certain code licensed by Oracle as indicated at
    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
    20     governed by the licenses under which they were offered by Oracle.
    22 As such, it allows licensees and sublicensees of Oracle's GPL2 OpenJDK Code to
    23 build an executable that includes those portions of necessary code that Oracle
    24 could not provide under GPL2 (or that Oracle has provided under GPL2 with the
    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.

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