RFR: 8280397: Factor out task queue statistics printing

[Per Liden]

On Fri, 21 Jan 2022 11:45:59 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   can I have reviews for this change that makes task queue (set) printing available in a central place so that not every user needs to reinvent the wheel?
> As example I wired up existing G1/Parallel GC young collection statistics printing, but I intend to add this for full gcs too; since ZGC and Shenandoah do not print task queues at all I do not intend to do that at least initially.
> Currently the main printing method is in `CollectedHeap`, but I can move it elsewhere if needed (all but Serial GC do use task queue sets though, so.....).
> 
> Testing: gha (building), local testing
> 
> Thanks,
>   Thomas

src/hotspot/share/gc/shared/collectedHeap.inline.hpp line 55:

> 53: #if TASKQUEUE_STATS
> 54: template <class T, MEMFLAGS F>
> 55: inline void CollectedHeap::print_and_reset_taskqueue_stats(GenericTaskQueueSet<T, F>* queue_set, const char* label) const {

Can we please move this function to `GenericTaskQueueSet`? It seems to have little to do with `CollectedHeap`.

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PR: https://git.openjdk.java.net/jdk/pull/7174