RFR (XS): 8238229: Remove TRACESPINNING debug code

[Stefan Johansson]

Looks good,
StefanJ

On 2020-01-30 12:56, Thomas Schatzl wrote:
> Hi all,
> 
>    can I have reviews for this removal of some debug code in the 
> TaskTerminator class?
> 
> The code counts the total number of yields/peeks/spins during task 
> termination. Since it is guarded by a define, the code is not included 
> in any regular build, so there is potential for bit-rotting.
> 
> Since the code is not very complicated (and I believe it is too simple 
> for real measurements), and needs rebuild anyway for use I propose to 
> just remove it instead of trying to improve it for unknown requirements.
> 
> Based on JDK-8238220.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8238229
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8238229/webrev/

I agree that this can be removed, and there is even more code that 
should go. The call from each collected heap:
src/hotspot/share/gc/shared/genCollectedHeap.cpp:680:#ifdef TRACESPINNING
src/hotspot/share/gc/parallel/psParallelCompact.cpp:1972:#ifdef 
TRACESPINNING
src/hotspot/share/gc/parallel/psScavenge.cpp:734:#ifdef TRACESPINNING
src/hotspot/share/gc/g1/g1CollectedHeap.cpp:1135:#ifdef TRACESPINNING
src/hotspot/share/gc/g1/g1CollectedHeap.cpp:3143:#ifdef TRACESPINNING

Otherwise, looks good,
StefanJ

> Testing:
> local compilation
> 
> Thanks,
>    Thomas