7146343: PS invoke methods should indicate the type of gc done

Reviewed-by: stefank, jmasa

src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp

@@ -100,12 +100,12 @@ void PSMarkSweep::invoke(bool maximum_heap_compaction) {
 
 // This method contains no policy. You should probably
 // be calling invoke() instead.
-void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
+bool PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
   assert(ref_processor() != NULL, "Sanity");
 
   if (GC_locker::check_active_before_gc()) {
-    return;
+    return false;
   }
 
   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
@@ -382,6 +382,8 @@ void PSMarkSweep::invoke_no_policy(bool clear_all_softrefs) {
 #ifdef TRACESPINNING
   ParallelTaskTerminator::print_termination_counts();
 #endif
+
+  return true;
 }
 
 bool PSMarkSweep::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy,

src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.hpp

 /*
- * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -78,7 +78,7 @@ class PSMarkSweep : public MarkSweep {
 
  public:
   static void invoke(bool clear_all_softrefs);
-  static void invoke_no_policy(bool clear_all_softrefs);
+  static bool invoke_no_policy(bool clear_all_softrefs);
 
   static void initialize();
 

src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp

@@ -1993,12 +1993,12 @@ bool ParallelCompactData::region_contains(size_t region_index, HeapWord* addr) {
 
 // This method contains no policy. You should probably
 // be calling invoke() instead.
-void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) {
+bool PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
   assert(ref_processor() != NULL, "Sanity");
 
   if (GC_locker::check_active_before_gc()) {
-    return;
+    return false;
   }
 
   TimeStamp marking_start;
@@ -2248,6 +2248,8 @@ void PSParallelCompact::invoke_no_policy(bool maximum_heap_compaction) {
 #ifdef TRACESPINNING
   ParallelTaskTerminator::print_termination_counts();
 #endif
+
+  return true;
 }
 
 bool PSParallelCompact::absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy,

src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.hpp

 /*
- * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1057,7 +1057,7 @@ class PSParallelCompact : AllStatic {
   }
 
   static void invoke(bool maximum_heap_compaction);
-  static void invoke_no_policy(bool maximum_heap_compaction);
+  static bool invoke_no_policy(bool maximum_heap_compaction);
 
   static void post_initialize();
   // Perform initialization for PSParallelCompact that requires

src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp

@@ -215,36 +215,41 @@ void PSRefProcTaskExecutor::execute(EnqueueTask& task)
 //
 // Note that this method should only be called from the vm_thread while
 // at a safepoint!
-void PSScavenge::invoke() {
+bool PSScavenge::invoke() {
   assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
   assert(Thread::current() == (Thread*)VMThread::vm_thread(), "should be in vm thread");
   assert(!Universe::heap()->is_gc_active(), "not reentrant");
 
-  ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
+  ParallelScavengeHeap* const heap = (ParallelScavengeHeap*)Universe::heap();
   assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
 
   PSAdaptiveSizePolicy* policy = heap->size_policy();
   IsGCActiveMark mark;
 
-  bool scavenge_was_done = PSScavenge::invoke_no_policy();
+  const bool scavenge_done = PSScavenge::invoke_no_policy();
+  const bool need_full_gc = !scavenge_done ||
+    policy->should_full_GC(heap->old_gen()->free_in_bytes());
+  bool full_gc_done = false;
 
-  PSGCAdaptivePolicyCounters* counters = heap->gc_policy_counters();
-  if (UsePerfData)
-    counters->update_full_follows_scavenge(0);
-  if (!scavenge_was_done ||
-      policy->should_full_GC(heap->old_gen()->free_in_bytes())) {
-    if (UsePerfData)
-      counters->update_full_follows_scavenge(full_follows_scavenge);
+  if (UsePerfData) {
+    PSGCAdaptivePolicyCounters* const counters = heap->gc_policy_counters();
+    const int ffs_val = need_full_gc ? full_follows_scavenge : not_skipped;
+    counters->update_full_follows_scavenge(ffs_val);
+  }
+
+  if (need_full_gc) {
     GCCauseSetter gccs(heap, GCCause::_adaptive_size_policy);
     CollectorPolicy* cp = heap->collector_policy();
     const bool clear_all_softrefs = cp->should_clear_all_soft_refs();
 
     if (UseParallelOldGC) {
-      PSParallelCompact::invoke_no_policy(clear_all_softrefs);
+      full_gc_done = PSParallelCompact::invoke_no_policy(clear_all_softrefs);
     } else {
-      PSMarkSweep::invoke_no_policy(clear_all_softrefs);
+      full_gc_done = PSMarkSweep::invoke_no_policy(clear_all_softrefs);
     }
   }
+
+  return full_gc_done;
 }
 
 // This method contains no policy. You should probably

src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp

@@ -117,10 +117,9 @@ class PSScavenge: AllStatic {
   // Called by parallelScavengeHeap to init the tenuring threshold
   static void initialize();
 
-  // Scavenge entry point
-  static void invoke();
-  // Return true is a collection was done.  Return
-  // false if the collection was skipped.
+  // Scavenge entry point.  This may invoke a full gc; return true if so.
+  static bool invoke();
+  // Return true if a collection was done; false otherwise.
   static bool invoke_no_policy();
 
   // If an attempt to promote fails, this method is invoked