8273144: Remove unused top level "Sample Collection Set Candidates" logging

Reviewed-by: iwalulya, ayang

Author: Thomas Schatzl

src/hotspot/share/gc/g1/g1GCPhaseTimes.cpp

@@ -175,7 +175,6 @@ void G1GCPhaseTimes::reset() {
   _recorded_prepare_heap_roots_time_ms = 0.0;
   _recorded_young_cset_choice_time_ms = 0.0;
   _recorded_non_young_cset_choice_time_ms = 0.0;
-  _recorded_sample_collection_set_candidates_time_ms = 0.0;
   _recorded_preserve_cm_referents_time_ms = 0.0;
   _recorded_start_new_cset_time_ms = 0.0;
   _recorded_serial_free_cset_time_ms = 0.0;
@@ -463,7 +462,6 @@ double G1GCPhaseTimes::print_post_evacuate_collection_set() const {
                         _recorded_preserve_cm_referents_time_ms +
                         _cur_ref_proc_time_ms +
                         (_weak_phase_times.total_time_sec() * MILLIUNITS) +
-                        _recorded_sample_collection_set_candidates_time_ms +
                         _cur_post_evacuate_cleanup_1_time_ms +
                         _cur_post_evacuate_cleanup_2_time_ms +
                         _recorded_total_rebuild_freelist_time_ms +
@@ -487,7 +485,6 @@ double G1GCPhaseTimes::print_post_evacuate_collection_set() const {
     debug_phase(_gc_par_phases[RemoveSelfForwardingPtr], 1);
   }
 
-  debug_time("Sample Collection Set Candidates", _recorded_sample_collection_set_candidates_time_ms);
   trace_phase(_gc_par_phases[RedirtyCards]);
   debug_time("Post Evacuate Cleanup 2", _cur_post_evacuate_cleanup_2_time_ms);
   if (G1CollectedHeap::heap()->evacuation_failed()) {

src/hotspot/share/gc/g1/g1GCPhaseTimes.hpp

@@ -186,8 +186,6 @@ class G1GCPhaseTimes : public CHeapObj<mtGC> {
   double _recorded_young_cset_choice_time_ms;
   double _recorded_non_young_cset_choice_time_ms;
 
-  double _recorded_sample_collection_set_candidates_time_ms;
-
   double _recorded_preserve_cm_referents_time_ms;
 
   double _recorded_start_new_cset_time_ms;
@@ -344,10 +342,6 @@ class G1GCPhaseTimes : public CHeapObj<mtGC> {
     _recorded_non_young_cset_choice_time_ms = time_ms;
   }
 
-  void record_sample_collection_set_candidates_time_ms(double time_ms) {
-    _recorded_sample_collection_set_candidates_time_ms = time_ms;
-  }
-
   void record_preserve_cm_referents_time_ms(double time_ms) {
     _recorded_preserve_cm_referents_time_ms = time_ms;
   }

test/hotspot/jtreg/gc/g1/TestGCLogMessages.java

@@ -140,7 +140,6 @@ public boolean isAvailable() {
         new LogMessageWithLevel("Region Register", Level.DEBUG),
         new LogMessageWithLevel("Prepare Heap Roots", Level.DEBUG),
         new LogMessageWithLevel("Concatenate Dirty Card Logs", Level.DEBUG),
-        new LogMessageWithLevel("Sample Collection Set Candidates", Level.DEBUG),
         // Free CSet
         new LogMessageWithLevel("Free Collection Set", Level.DEBUG),
         new LogMessageWithLevel("Serial Free Collection Set", Level.TRACE),