6992192: Need option to configure if direct memory is page aligned (XS)

David Holmes David.Holmes at oracle.com
Fri Oct 15 04:44:57 PDT 2010

Alan Bateman said the following on 10/15/10 18:02:
> David Holmes wrote:
>> :
>> What am I missing here. We set a VM option that sets a property. Why 
>> doesn't the end user just set the property directly ???
> It has to be the command-line as explicitly called System.setProperty 
> may be too late. The reason for making it a VM option is that its a 
> comrade to the existing MaxDirectMemorySize option, and it might be 
> strange/inconsistent to configure the same resource partly with a VM 
> option and partly with a system property.

Sorry but I don't understand why either of them are VM options when it 
would appear you could just do:

java -Dsun.nio.MaxDirectMemorySize=16M -Dsun.nio.PageAlignDirectMemory=true


More information about the hotspot-runtime-dev mailing list