RFR: 8252367: Undo JDK-8245000: Windows GDI functions don't support large pages

[Stefan Karlsson]

This was intended to go to hotspot-dev. Please review on that list. 
BCC:ing hotspot-gc-dev.

On 2020-08-26 13:52, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to re-enable large pages on Windows.
> 
> https://cr.openjdk.java.net/~stefank/8252367/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8252367
> 
> In JDK 15 we put in code that turns off large pages if it is detected 
> that Windows GDI functions don't work with large pages. Later in JDK 16, 
> and JDK 15.0.1, the code that uses GDI was rewritten to have a fallback 
> mechanism for these kinds of problems (JDK-8240654). Because of that we 
> don't need the workaround to turn off large pages anymore.
> 
> We also pushed a similar workaround patch to turn off NUMA interleaving 
> (JDK-8245002). That will be dealt with in a separate RFR (JDK-8252368).
> 
> I tested locally that the reproducer in JDK-8245000 doesn't reproduce 
> with the proposed patch. I also tested that also reverting the patch in 
> JDK-8240654 causes reproducer to reproduce again.
> 
> Thanks,
> StefanK