RFR: 8344263: GenShen: Reduce extraneous log messages at INFO level

[Aleksey Shipilev]

On Fri, 15 Nov 2024 01:26:43 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Genshen logs a lot of fine level detail at `gc=info`. This category should be reserved for major phase changes in the gc cycle.

Sorry, maybe I was too hard about `debug`. Maybe it should be `gc,ergo=info` instead, like the rest of heuristics code. "Want to see GC did? Enable -Xlog:gc. Want to see _why_ GC did it? Enable -Xlog:gc+ergo."

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PR Review: https://git.openjdk.org/shenandoah/pull/540#pullrequestreview-2438351304