RFR: 8246272: Make use of GCLogPrecious for G1, Parallel and Serial

[Erik Österlund]

Hi Stefan,

Looks good.

Thanks,
/Erik

> On 8 Jun 2020, at 20:49, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this patch to turn the GC init logging into "precious" logging, so that those lines get dumped into the hs_err file.
> 
> https://cr.openjdk.java.net/~stefank/8246272/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8246272
> 
> Example output from a G1 hs_err file:
> 
> GC Precious Log:
>  CPUs: 32 total, 32 available
>  Memory: 125G
>  Large Page Support: Disabled
>  NUMA Support: Disabled
>  Compressed Oops: Enabled (Zero based)
>  Heap Region Size: 16M
>  Heap Min Capacity: 16M
>  Heap Initial Capacity: 2016M
>  Heap Max Capacity: 30688M
>  Pre-touch: Disabled
>  Parallel Workers: 23
>  Concurrent Workers: 6
>  Concurrent Refinement Workers: 23
>  Periodic GC: Disabled
> 
> I've changed the generic GCInitLogger so all GCs get these lines dumped. I've also added the G1 and Parallel specific lines. I can add the Shenandoah and Epsilon specific lines, if it is requested.
> 
> Thanks,
> StefanK