--- /dev/null 2018-04-03 12:55:20.301839954 +0200 +++ new/src/hotspot/share/gc/z/zPage.cpp 2018-06-08 19:46:27.825051640 +0200 @@ -0,0 +1,173 @@ +/* + * Copyright (c) 2015, 2017, 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. + */ + +#include "precompiled.hpp" +#include "gc/shared/collectedHeap.hpp" +#include "gc/z/zAddress.inline.hpp" +#include "gc/z/zForwardingTable.inline.hpp" +#include "gc/z/zHeap.inline.hpp" +#include "gc/z/zLiveMap.inline.hpp" +#include "gc/z/zMark.hpp" +#include "gc/z/zPage.inline.hpp" +#include "gc/z/zPhysicalMemory.inline.hpp" +#include "gc/z/zStat.hpp" +#include "gc/z/zThread.hpp" +#include "gc/z/zUtils.inline.hpp" +#include "logging/log.hpp" +#include "runtime/orderAccess.hpp" +#include "utilities/align.hpp" +#include "utilities/debug.hpp" +#include "utilities/globalDefinitions.hpp" + +static const ZStatCounter ZCounterRelocationContention("Contention", "Relocation Contention", ZStatUnitOpsPerSecond); + +ZPage::ZPage(uint8_t type, ZVirtualMemory vmem, ZPhysicalMemory pmem) : + _type(type), + _pinned(0), + _numa_id((uint8_t)-1), + _seqnum(0), + _virtual(vmem), + _top(start()), + _livemap(object_max_count()), + _refcount(0), + _forwarding(), + _physical(pmem) { + assert(!_physical.is_null(), "Should not be null"); + assert(!_virtual.is_null(), "Should not be null"); + assert((type == ZPageTypeSmall && size() == ZPageSizeSmall) || + (type == ZPageTypeMedium && size() == ZPageSizeMedium) || + (type == ZPageTypeLarge && is_aligned(size(), ZPageSizeMin)), + "Page type/size mismatch"); +} + +ZPage::~ZPage() { + assert(!is_active(), "Should not be active"); + assert(is_detached(), "Should be detached"); +} + +void ZPage::reset() { + assert(!is_active(), "Should not be active"); + assert(!is_pinned(), "Should not be pinned"); + assert(!is_detached(), "Should not be detached"); + + _seqnum = ZGlobalSeqNum; + _top = start(); + _livemap.reset(); + + // Make sure we don't make the page active before + // the reset of the above fields are visible. + OrderAccess::storestore(); + + _refcount = 1; +} + +uintptr_t ZPage::relocate_object_inner(uintptr_t from_index, uintptr_t from_offset) { + ZForwardingTableCursor cursor; + + // Lookup address in forwarding table + const ZForwardingTableEntry entry = _forwarding.find(from_index, &cursor); + if (entry.from_index() == from_index) { + // Already relocated, return new address + return entry.to_offset(); + } + + // Not found in forwarding table, relocate object + assert(is_object_marked(from_offset), "Should be marked"); + + if (is_pinned()) { + // In-place forward + return _forwarding.insert(from_index, from_offset, &cursor); + } + + // Allocate object + const uintptr_t from_good = ZAddress::good(from_offset); + const size_t size = ZUtils::object_size(from_good); + const uintptr_t to_good = ZHeap::heap()->alloc_object_for_relocation(size); + if (to_good == 0) { + // Failed, in-place forward + return _forwarding.insert(from_index, from_offset, &cursor); + } + + // Copy object + ZUtils::object_copy(from_good, to_good, size); + + // Update forwarding table + const uintptr_t to_offset = ZAddress::offset(to_good); + const uintptr_t to_offset_final = _forwarding.insert(from_index, to_offset, &cursor); + if (to_offset_final == to_offset) { + // Relocation succeeded + return to_offset; + } + + // Relocation contention + ZStatInc(ZCounterRelocationContention); + log_trace(gc)("Relocation contention, thread: " PTR_FORMAT " (%s), page: " PTR_FORMAT + ", entry: " SIZE_FORMAT ", oop: " PTR_FORMAT ", size: " SIZE_FORMAT, + ZThread::id(), ZThread::name(), p2i(this), cursor, from_good, size); + + // Try undo allocation + ZHeap::heap()->undo_alloc_object_for_relocation(to_good, size); + + return to_offset_final; +} + +uintptr_t ZPage::relocate_object(uintptr_t from) { + assert(ZHeap::heap()->is_relocating(from), "Should be relocating"); + + const uintptr_t from_offset = ZAddress::offset(from); + const uintptr_t from_index = (from_offset - start()) >> object_alignment_shift(); + const uintptr_t to_offset = relocate_object_inner(from_index, from_offset); + if (from_offset == to_offset) { + // In-place forwarding, pin page + set_pinned(); + } + + return ZAddress::good(to_offset); +} + +uintptr_t ZPage::forward_object(uintptr_t from) { + assert(ZHeap::heap()->is_relocating(from), "Should be relocated"); + + // Lookup address in forwarding table + const uintptr_t from_offset = ZAddress::offset(from); + const uintptr_t from_index = (from_offset - start()) >> object_alignment_shift(); + const ZForwardingTableEntry entry = _forwarding.find(from_index); + assert(entry.from_index() == from_index, "Should be forwarded"); + + return ZAddress::good(entry.to_offset()); +} + +void ZPage::print_on(outputStream* out) const { + out->print_cr(" %-6s " PTR_FORMAT " " PTR_FORMAT " " PTR_FORMAT " %s%s%s%s%s%s", + type_to_string(), start(), top(), end(), + is_allocating() ? " Allocating" : "", + is_relocatable() ? " Relocatable" : "", + is_forwarding() ? " Forwarding" : "", + is_pinned() ? " Pinned" : "", + is_detached() ? " Detached" : "", + !is_active() ? " Inactive" : ""); +} + +void ZPage::print() const { + print_on(tty); +}