RFR: 8260586: Shenandoah: simplify "Concurrent Weak References" logging

[Roman Kennke]

On Thu, 28 Jan 2021 12:36:58 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Concurrent Weak References always does parallel worker operation. Therefore "Process" counter is redundant, and we might as well make the root counter the per-worker one. This simplifies GC logging.
> 
> Old log:
> 
> [95.220s][info][gc,stats] Concurrent Weak References         1709 us
> [95.220s][info][gc,stats]   Process                          1588 us, parallelism: 1.30x
> [95.220s][info][gc,stats]     CWRF: <total>                  2056 us
> [95.220s][info][gc,stats]     CWRF: Weak References          2056 us, workers (us): 454, 1450,   2, 145,   4,   1,   0,   0, 
> 
> New log:
> 
> [39.583s][info][gc,stats] Concurrent Weak References          651 us, parallelism: 1.52x
> [39.583s][info][gc,stats]   CWRF: <total>                     986 us
> [39.583s][info][gc,stats]   CWRF: Weak References             986 us, workers (us): 183,  29, 145, 627,   1,   0,   0,   0,

Looks good! Thanks!

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2288