--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/gcCause.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2002, 2015, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_SHARED_GCCAUSE_HPP
+#define SHARE_VM_GC_SHARED_GCCAUSE_HPP
+
+#include "memory/allocation.hpp"
+
+//
+// This class exposes implementation details of the various
+// collector(s), and we need to be very careful with it. If
+// use of this class grows, we should split it into public
+// and implementation-private "causes".
+//
+// The definitions in the SA code should be kept in sync
+// with the definitions here.
+//
+
+class GCCause : public AllStatic {
+ public:
+  enum Cause {
+    /* public */
+    _java_lang_system_gc,
+    _full_gc_alot,
+    _scavenge_alot,
+    _allocation_profiler,
+    _jvmti_force_gc,
+    _gc_locker,
+    _heap_inspection,
+    _heap_dump,
+    _wb_young_gc,
+    _wb_conc_mark,
+    _wb_full_gc,
+    _update_allocation_context_stats_inc,
+    _update_allocation_context_stats_full,
+
+    /* implementation independent, but reserved for GC use */
+    _no_gc,
+    _no_cause_specified,
+    _allocation_failure,
+
+    /* implementation specific */
+
+    _tenured_generation_full,
+    _metadata_GC_threshold,
+    _metadata_GC_clear_soft_refs,
+
+    _cms_generation_full,
+    _cms_initial_mark,
+    _cms_final_remark,
+    _cms_concurrent_mark,
+
+    _old_generation_expanded_on_last_scavenge,
+    _old_generation_too_full_to_scavenge,
+    _adaptive_size_policy,
+
+    _g1_inc_collection_pause,
+    _g1_humongous_allocation,
+
+    _dcmd_gc_run,
+
+    _last_gc_cause
+  };
+
+  inline static bool is_user_requested_gc(GCCause::Cause cause) {
+    return (cause == GCCause::_java_lang_system_gc ||
+            cause == GCCause::_dcmd_gc_run);
+  }
+
+  inline static bool is_serviceability_requested_gc(GCCause::Cause
+                                                             cause) {
+    return (cause == GCCause::_jvmti_force_gc ||
+            cause == GCCause::_heap_inspection ||
+            cause == GCCause::_heap_dump);
+  }
+
+  // Causes for collection of the tenured gernation
+  inline static bool is_tenured_allocation_failure_gc(GCCause::Cause cause) {
+    assert(cause != GCCause::_old_generation_too_full_to_scavenge &&
+           cause != GCCause::_old_generation_expanded_on_last_scavenge,
+           "This GCCause may be correct but is not expected yet: %s",
+           to_string(cause));
+    // _tenured_generation_full or _cms_generation_full for full tenured generations
+    // _adaptive_size_policy for a full collection after a young GC
+    // _allocation_failure is the generic cause a collection which could result
+    // in the collection of the tenured generation if there is not enough space
+    // in the tenured generation to support a young GC.
+    return (cause == GCCause::_tenured_generation_full ||
+            cause == GCCause::_cms_generation_full ||
+            cause == GCCause::_adaptive_size_policy ||
+            cause == GCCause::_allocation_failure);
+  }
+
+  // Causes for collection of the young generation
+  inline static bool is_allocation_failure_gc(GCCause::Cause cause) {
+    // _allocation_failure is the generic cause a collection for allocation failure
+    // _adaptive_size_policy is for a collecton done before a full GC
+    return (cause == GCCause::_allocation_failure ||
+            cause == GCCause::_adaptive_size_policy);
+  }
+
+  // Return a string describing the GCCause.
+  static const char* to_string(GCCause::Cause cause);
+};
+
+#endif // SHARE_VM_GC_SHARED_GCCAUSE_HPP