diff --git a/src/hotspot/share/gc/parallel/pcTasks.hpp b/src/hotspot/share/gc/parallel/pcTasks.hpp
deleted file mode 100644
index 7c2b6e342a4..00000000000
--- a/src/hotspot/share/gc/parallel/pcTasks.hpp
+++ /dev/null
@@ -1,210 +0,0 @@
-/*
- * Copyright (c) 2005, 2019, 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_GC_PARALLEL_PCTASKS_HPP
-#define SHARE_GC_PARALLEL_PCTASKS_HPP
-
-#include "gc/parallel/gcTaskManager.hpp"
-#include "gc/parallel/psParallelCompact.hpp"
-#include "gc/parallel/psTasks.hpp"
-#include "gc/shared/referenceProcessor.hpp"
-
-
-// Tasks for parallel compaction of the old generation
-//
-// Tasks are created and enqueued on a task queue. The
-// tasks for parallel old collector for marking objects
-// are MarkFromRootsTask and ThreadRootsMarkingTask.
-//
-// MarkFromRootsTask's are created
-// with a root group (e.g., jni_handles) and when the do_it()
-// method of a MarkFromRootsTask is executed, it starts marking
-// form it's root group.
-//
-// ThreadRootsMarkingTask's are created for each Java thread.  When
-// the do_it() method of a ThreadRootsMarkingTask is executed, it
-// starts marking from the thread's roots.
-//
-// The enqueueing of the MarkFromRootsTask and ThreadRootsMarkingTask
-// do little more than create the task and put it on a queue.  The
-// queue is a GCTaskQueue and threads steal tasks from this GCTaskQueue.
-//
-// In addition to the MarkFromRootsTask and ThreadRootsMarkingTask
-// tasks there are StealMarkingTask tasks.  The StealMarkingTask's
-// steal a reference from the marking stack of another
-// thread and transitively marks the object of the reference
-// and internal references.  After successfully stealing a reference
-// and marking it, the StealMarkingTask drains its marking stack
-// stack before attempting another steal.
-//
-// ThreadRootsMarkingTask
-//
-// This task marks from the roots of a single thread. This task
-// enables marking of thread roots in parallel.
-//
-
-class ParallelTaskTerminator;
-
-class ThreadRootsMarkingTask : public GCTask {
- private:
-  Thread* _thread;
-
- public:
-  ThreadRootsMarkingTask(Thread* root) : _thread(root) {}
-
-  char* name() { return (char *)"thread-roots-marking-task"; }
-
-  virtual void do_it(GCTaskManager* manager, uint which);
-};
-
-
-//
-// MarkFromRootsTask
-//
-// This task marks from all the roots to all live
-// objects.
-//
-//
-
-class MarkFromRootsTask : public GCTask {
- public:
-  enum RootType {
-    universe              = 1,
-    jni_handles           = 2,
-    threads               = 3,
-    object_synchronizer   = 4,
-    management            = 5,
-    jvmti                 = 6,
-    system_dictionary     = 7,
-    class_loader_data     = 8,
-    code_cache            = 9
-    JVMCI_ONLY(COMMA jvmci = 10)
-  };
- private:
-  RootType _root_type;
- public:
-  MarkFromRootsTask(RootType value) : _root_type(value) {}
-
-  char* name() { return (char *)"mark-from-roots-task"; }
-
-  virtual void do_it(GCTaskManager* manager, uint which);
-};
-
-//
-// RefProcTaskProxy
-//
-// This task is used as a proxy to parallel reference processing tasks .
-//
-
-class RefProcTaskProxy : public GCTask {
-  typedef AbstractRefProcTaskExecutor::ProcessTask ProcessTask;
-  ProcessTask & _rp_task;
-  uint          _work_id;
-public:
-  RefProcTaskProxy(ProcessTask & rp_task, uint work_id)
-    : _rp_task(rp_task),
-      _work_id(work_id)
-  { }
-
-private:
-  virtual char* name() { return (char *)"Process referents by policy in parallel"; }
-
-  virtual void do_it(GCTaskManager* manager, uint which);
-};
-
-
-//
-// RefProcTaskExecutor
-//
-// Task executor is an interface for the reference processor to run
-// tasks using GCTaskManager.
-//
-
-class RefProcTaskExecutor: public AbstractRefProcTaskExecutor {
-  virtual void execute(ProcessTask& task, uint ergo_workers);
-};
-
-
-//
-// StealMarkingTask
-//
-// This task is used to distribute work to idle threads.
-//
-
-class StealMarkingTask : public GCTask {
- private:
-   ParallelTaskTerminator* const _terminator;
- private:
-
- public:
-  char* name() { return (char *)"steal-marking-task"; }
-
-  StealMarkingTask(ParallelTaskTerminator* t);
-
-  ParallelTaskTerminator* terminator() { return _terminator; }
-
-  virtual void do_it(GCTaskManager* manager, uint which);
-};
-
-//
-// CompactionWithStealingTask
-//
-// This task is used to distribute work to idle threads.
-//
-
-class CompactionWithStealingTask : public GCTask {
- private:
-   ParallelTaskTerminator* const _terminator;
- public:
-  CompactionWithStealingTask(ParallelTaskTerminator* t);
-
-  char* name() { return (char *)"steal-region-task"; }
-  ParallelTaskTerminator* terminator() { return _terminator; }
-
-  virtual void do_it(GCTaskManager* manager, uint which);
-};
-
-//
-// UpdateDensePrefixTask
-//
-// This task is used to update the dense prefix
-// of a space.
-//
-
-class UpdateDensePrefixTask : public GCTask {
- private:
-  PSParallelCompact::SpaceId _space_id;
-  size_t _region_index_start;
-  size_t _region_index_end;
-
- public:
-  char* name() { return (char *)"update-dense_prefix-task"; }
-
-  UpdateDensePrefixTask(PSParallelCompact::SpaceId space_id,
-                        size_t region_index_start,
-                        size_t region_index_end);
-
-  virtual void do_it(GCTaskManager* manager, uint which);
-};
-#endif // SHARE_GC_PARALLEL_PCTASKS_HPP