RFR: Recompute generation accounts after fullgc

[William Kemper]

On Wed, 29 Mar 2023 21:26:40 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> This fix addresses a problem found during verification following full gcs.  This recomputes the generation usage at the end of full GC as part of a 5th phase of full gc.
> 
> We may be able to remove this 5th phase at a later time after we find and fix whatever errors exist in generation accounting in the existing full gc implementation.

src/hotspot/share/gc/shenandoah/shenandoahFullGC.cpp line 1486:

> 1484: }
> 1485: 
> 1486: void ShenandoahFullGC::phase5_restore_generation_accounts() {

Maybe call this `phase5_restore_generation_usage` for consistency with `establish_usage`?

-------------

PR Review Comment: https://git.openjdk.org/shenandoah/pull/235#discussion_r1152574298