RFR: Report Traversal status in heap sampling

[Roman Kennke]

Good! Thanks!

Am 15. August 2018 18:16:14 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>Trivial change to allow Visualizer capture Traversal-in-progress:
>
>diff -r 004f55114c5f
>src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.cpp
>--- a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.cpp 
>Wed Aug 15 17:52:58 2018 +0200
>+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.cpp 
>Wed Aug 15 18:14:55 2018 +0200
>@@ -93,7 +93,8 @@
>       ShenandoahHeap* heap = ShenandoahHeap::heap();
>       jlong status = 0;
>-      if (heap->is_concurrent_mark_in_progress()) status |= 1 << 0;
>-      if (heap->is_evacuation_in_progress())   status |= 1 << 1;
>-      if (heap->is_update_refs_in_progress())  status |= 1 << 2;
>+      if (heap->is_concurrent_mark_in_progress())      status |= 1 <<
>0;
>+      if (heap->is_evacuation_in_progress())           status |= 1 <<
>1;
>+      if (heap->is_update_refs_in_progress())          status |= 1 <<
>2;
>+      if (heap->is_concurrent_traversal_in_progress()) status |= 1 <<
>3;
>       _status->set_value(status);
>
>diff -r 004f55114c5f
>src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.hpp
>--- a/src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.hpp 
>Wed Aug 15 17:52:58 2018 +0200
>+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeapRegionCounters.hpp 
>Wed Aug 15 18:14:55 2018 +0200
>@@ -40,4 +40,5 @@
>  *     - bit 1 set when evacuation in progress
>  *     - bit 2 set when update refs in progress
>+ *     - bit 3 set when traversal in progress
>  *
>* two variable counters per region, with $max_regions (see above)
>counters:
>
>Testing: eyeballing Visualizer
>
>Thanks,
>-Aleksey

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