RFR: 8300053: Shenandoah: Handle more GCCauses in ShenandoahControlThread::request_gc

[William Kemper]

On Thu, 12 Jan 2023 16:15:08 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> $ CONF=linux-x86_64-server-fastdebug make test TEST=jdk/internal/vm/Continuation/BasicExt.java TEST_VM_OPTS="-XX:+UseShenandoahGC"
> 
> # Internal Error (/home/shade/trunks/jdk/src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp:479), pid=406430, tid=406562
> # assert(GCCause::is_user_requested_gc(cause) || GCCause::is_serviceability_requested_gc(cause) || cause == GCCause::_metadata_GC_clear_soft_refs || cause == GCCause::_codecache_GC_aggressive || cause == GCCause::_codecache_GC_threshold || cause == GCCause::_full_gc_alot || cause == GCCause::_wb_full_gc || cause == GCCause::_wb_breakpoint || cause == GCCause::_scavenge_alot) failed: only requested GCs here: WhiteBox Initiated Young GC
> #
> ``` 
> 
> Added a missing cause into the assert. The test starts to pass.

We will need to handle `wb_young_gc` appropriately for Shenandoah's generational mode.

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Marked as reviewed by wkemper (no project role).

PR: https://git.openjdk.org/jdk/pull/11970