RFR [1/2] 8065358: JDK-8065218 Move CMS-specific fields from Space to CompactibleFreeListSpace

Sangheon Kim sangheon.kim at oracle.com
Thu Nov 20 16:56:40 UTC 2014

Hi Mikael,

Looks good.

One question about a function/variable name.
I know the original names are using upper/lower-cases but according to 
hotspot coding style, only lower-case are recommended for 
function/variable names.
As it seems easy to change, how about changing them?


On 11/20/2014 12:46 AM, Mikael Gerdin wrote:
> Hi all,
> This is the first patch of two to fix JDK-8065358.
> In this change I suggest that we move a field used only by CMS to 
> CompactibleFreeListSpace and introduce a virtual getter in the Space 
> base class.
> I estimate that the performance impact of the virtual call will be 
> small since the getter path already does several virtual calls.
> Moving the field will allow me to add another field to G1's 
> G1OffsetTableContigSpace in patch [2/2] without introducing a 
> footprint regression.
> Webrev: http://cr.openjdk.java.net/~mgerdin/8065218/webrev.0/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8065218
> Parent bug: https://bugs.openjdk.java.net/browse/JDK-8065358
> Testing: JPRT
> Thanks
> /Mikael

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