RFR (XS): 8213927: G1 ignores AlwaysPreTouch when UseTransparentHugePages is enabled

Stefan Johansson stefan.johansson at oracle.com
Wed Nov 21 14:42:48 UTC 2018



On 2018-11-15 16:20, Thomas Schatzl wrote:
> Hi all,
> 
>    can I have reviews for this small fix that changes the page size to
> use when pretouching if UseTransparentHugePages is enabled on the
> command line?
> 
> The problem is that previously, with UseTransparentHugePages, G1 used
> large page increments for pretouching, but since these huge pages are
> "transparent" except for commit purposes (in the VM), we need to
> pretouch on a small page size in this case.
> 
> This change just implements that.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8213927
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8213927/webrev/
Looks good!
StefanJ
> Testing:
> hs-tier1-3; manual checking RSS sizes on Linux with different options
> 
> Thanks,
>    Thomas
> 


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