src/hotspot/share/gc/z/zRelocate.cpp
author pliden
Wed, 19 Sep 2018 19:12:18 +0200
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permissions -rw-r--r--
8210881: ZGC: Introduce ZRootsIteratorClosure Reviewed-by: eosterlund
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/*
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 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#include "precompiled.hpp"
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#include "gc/z/zHeap.hpp"
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#include "gc/z/zOopClosures.inline.hpp"
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#include "gc/z/zPage.hpp"
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#include "gc/z/zRelocate.hpp"
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#include "gc/z/zRelocationSet.inline.hpp"
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#include "gc/z/zRootsIterator.hpp"
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#include "gc/z/zTask.hpp"
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#include "gc/z/zWorkers.hpp"
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ZRelocate::ZRelocate(ZWorkers* workers) :
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    _workers(workers) {}
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class ZRelocateRootsIteratorClosure : public ZRootsIteratorClosure {
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public:
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  virtual void do_thread(Thread* thread) {
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    ZRootsIteratorClosure::do_thread(thread);
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    // Update thread local address bad mask
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    ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask);
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  }
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  virtual void do_oop(oop* p) {
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    ZBarrier::relocate_barrier_on_root_oop_field(p);
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  }
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  virtual void do_oop(narrowOop* p) {
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    ShouldNotReachHere();
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  }
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};
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class ZRelocateRootsTask : public ZTask {
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private:
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  ZRootsIterator _roots;
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public:
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  ZRelocateRootsTask() :
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      ZTask("ZRelocateRootsTask"),
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      _roots() {}
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  virtual void work() {
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    // During relocation we need to visit the JVMTI
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    // export weak roots to rehash the JVMTI tag map
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    ZRelocateRootsIteratorClosure cl;
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    _roots.oops_do(&cl, true /* visit_jvmti_weak_export */);
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  }
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};
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void ZRelocate::start() {
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  ZRelocateRootsTask task;
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  _workers->run_parallel(&task);
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}
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class ZRelocateObjectClosure : public ObjectClosure {
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private:
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  ZPage* const _page;
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public:
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  ZRelocateObjectClosure(ZPage* page) :
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      _page(page) {}
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  virtual void do_object(oop o) {
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    _page->relocate_object(ZOop::to_address(o));
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  }
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};
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bool ZRelocate::work(ZRelocationSetParallelIterator* iter) {
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  bool success = true;
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  // Relocate pages in the relocation set
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  for (ZPage* page; iter->next(&page);) {
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    // Relocate objects in page
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    ZRelocateObjectClosure cl(page);
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    page->object_iterate(&cl);
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    if (ZVerifyForwarding) {
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      page->verify_forwarding();
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    }
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    if (page->is_pinned()) {
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      // Relocation failed, page is now pinned
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      success = false;
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    } else {
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      // Relocation succeeded, release page
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      ZHeap::heap()->release_page(page, true /* reclaimed */);
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    }
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  }
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  return success;
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}
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class ZRelocateTask : public ZTask {
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private:
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  ZRelocate* const               _relocate;
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  ZRelocationSetParallelIterator _iter;
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  bool                           _failed;
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  ZRelocateTask(ZRelocate* relocate, ZRelocationSet* relocation_set) :
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      ZTask("ZRelocateTask"),
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      _relocate(relocate),
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      _iter(relocation_set),
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      _failed(false) {}
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  virtual void work() {
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    if (!_relocate->work(&_iter)) {
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      _failed = true;
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    }
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  }
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  bool failed() const {
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    return _failed;
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  }
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};
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bool ZRelocate::relocate(ZRelocationSet* relocation_set) {
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  ZRelocateTask task(this, relocation_set);
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  _workers->run_concurrent(&task);
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  return !task.failed();
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}