author | pliden |
Tue, 12 Jun 2018 17:40:28 +0200 | |
changeset 50525 | 767cdb97f103 |
child 54094 | ed3c6f07faab |
permissions | -rw-r--r-- |
50525
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/* |
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* Copyright (c) 2015, 2017, 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/shared/collectedHeap.hpp" |
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#include "gc/z/zAddress.inline.hpp" |
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#include "gc/z/zForwardingTable.inline.hpp" |
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#include "gc/z/zHeap.inline.hpp" |
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#include "gc/z/zLiveMap.inline.hpp" |
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#include "gc/z/zMark.hpp" |
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#include "gc/z/zPage.inline.hpp" |
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#include "gc/z/zPhysicalMemory.inline.hpp" |
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#include "gc/z/zStat.hpp" |
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#include "gc/z/zThread.hpp" |
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#include "gc/z/zUtils.inline.hpp" |
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#include "logging/log.hpp" |
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#include "runtime/orderAccess.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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static const ZStatCounter ZCounterRelocationContention("Contention", "Relocation Contention", ZStatUnitOpsPerSecond); |
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ZPage::ZPage(uint8_t type, ZVirtualMemory vmem, ZPhysicalMemory pmem) : |
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_type(type), |
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_pinned(0), |
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_numa_id((uint8_t)-1), |
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_seqnum(0), |
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_virtual(vmem), |
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_top(start()), |
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_livemap(object_max_count()), |
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_refcount(0), |
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_forwarding(), |
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_physical(pmem) { |
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assert(!_physical.is_null(), "Should not be null"); |
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assert(!_virtual.is_null(), "Should not be null"); |
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assert((type == ZPageTypeSmall && size() == ZPageSizeSmall) || |
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(type == ZPageTypeMedium && size() == ZPageSizeMedium) || |
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(type == ZPageTypeLarge && is_aligned(size(), ZPageSizeMin)), |
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"Page type/size mismatch"); |
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} |
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ZPage::~ZPage() { |
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assert(!is_active(), "Should not be active"); |
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assert(is_detached(), "Should be detached"); |
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} |
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void ZPage::reset() { |
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assert(!is_active(), "Should not be active"); |
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assert(!is_pinned(), "Should not be pinned"); |
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assert(!is_detached(), "Should not be detached"); |
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_seqnum = ZGlobalSeqNum; |
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_top = start(); |
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_livemap.reset(); |
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// Make sure we don't make the page active before |
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// the reset of the above fields are visible. |
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OrderAccess::storestore(); |
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_refcount = 1; |
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} |
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uintptr_t ZPage::relocate_object_inner(uintptr_t from_index, uintptr_t from_offset) { |
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ZForwardingTableCursor cursor; |
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// Lookup address in forwarding table |
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const ZForwardingTableEntry entry = _forwarding.find(from_index, &cursor); |
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if (entry.from_index() == from_index) { |
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// Already relocated, return new address |
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return entry.to_offset(); |
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} |
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// Not found in forwarding table, relocate object |
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assert(is_object_marked(from_offset), "Should be marked"); |
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if (is_pinned()) { |
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// In-place forward |
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return _forwarding.insert(from_index, from_offset, &cursor); |
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} |
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// Allocate object |
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const uintptr_t from_good = ZAddress::good(from_offset); |
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const size_t size = ZUtils::object_size(from_good); |
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const uintptr_t to_good = ZHeap::heap()->alloc_object_for_relocation(size); |
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if (to_good == 0) { |
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// Failed, in-place forward |
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return _forwarding.insert(from_index, from_offset, &cursor); |
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} |
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// Copy object |
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ZUtils::object_copy(from_good, to_good, size); |
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// Update forwarding table |
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const uintptr_t to_offset = ZAddress::offset(to_good); |
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const uintptr_t to_offset_final = _forwarding.insert(from_index, to_offset, &cursor); |
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if (to_offset_final == to_offset) { |
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// Relocation succeeded |
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return to_offset; |
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} |
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|
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// Relocation contention |
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ZStatInc(ZCounterRelocationContention); |
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log_trace(gc)("Relocation contention, thread: " PTR_FORMAT " (%s), page: " PTR_FORMAT |
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", entry: " SIZE_FORMAT ", oop: " PTR_FORMAT ", size: " SIZE_FORMAT, |
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ZThread::id(), ZThread::name(), p2i(this), cursor, from_good, size); |
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|
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// Try undo allocation |
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ZHeap::heap()->undo_alloc_object_for_relocation(to_good, size); |
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|
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return to_offset_final; |
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} |
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|
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uintptr_t ZPage::relocate_object(uintptr_t from) { |
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assert(ZHeap::heap()->is_relocating(from), "Should be relocating"); |
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|
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const uintptr_t from_offset = ZAddress::offset(from); |
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const uintptr_t from_index = (from_offset - start()) >> object_alignment_shift(); |
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const uintptr_t to_offset = relocate_object_inner(from_index, from_offset); |
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if (from_offset == to_offset) { |
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// In-place forwarding, pin page |
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set_pinned(); |
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} |
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|
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return ZAddress::good(to_offset); |
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} |
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uintptr_t ZPage::forward_object(uintptr_t from) { |
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assert(ZHeap::heap()->is_relocating(from), "Should be relocated"); |
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|
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// Lookup address in forwarding table |
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const uintptr_t from_offset = ZAddress::offset(from); |
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const uintptr_t from_index = (from_offset - start()) >> object_alignment_shift(); |
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const ZForwardingTableEntry entry = _forwarding.find(from_index); |
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assert(entry.from_index() == from_index, "Should be forwarded"); |
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|
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return ZAddress::good(entry.to_offset()); |
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} |
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|
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void ZPage::print_on(outputStream* out) const { |
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out->print_cr(" %-6s " PTR_FORMAT " " PTR_FORMAT " " PTR_FORMAT " %s%s%s%s%s%s", |
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type_to_string(), start(), top(), end(), |
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is_allocating() ? " Allocating" : "", |
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is_relocatable() ? " Relocatable" : "", |
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is_forwarding() ? " Forwarding" : "", |
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is_pinned() ? " Pinned" : "", |
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is_detached() ? " Detached" : "", |
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!is_active() ? " Inactive" : ""); |
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} |
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|
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void ZPage::print() const { |
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print_on(tty); |
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} |