src/hotspot/share/gc/z/zGlobals.hpp

/*
 * Copyright (c) 2015, 2018, 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.
 *
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#ifndef SHARE_GC_Z_ZGLOBALS_HPP
#define SHARE_GC_Z_ZGLOBALS_HPP

#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
#include OS_CPU_HEADER(gc/z/zGlobals)

// Collector name
const char* const ZGCName                       = "The Z Garbage Collector";

// Global phase state
extern uint32_t   ZGlobalPhase;
const uint32_t    ZPhaseMark                    = 0;
const uint32_t    ZPhaseMarkCompleted           = 1;
const uint32_t    ZPhaseRelocate                = 2;

// Global sequence number
extern uint32_t   ZGlobalSeqNum;

// Page types
const uint8_t     ZPageTypeSmall                = 0;
const uint8_t     ZPageTypeMedium               = 1;
const uint8_t     ZPageTypeLarge                = 2;

// Page size shifts
const size_t      ZPageSizeSmallShift           = ZPlatformPageSizeSmallShift;
const size_t      ZPageSizeMediumShift          = ZPageSizeSmallShift + 4;
const size_t      ZPageSizeMinShift             = ZPageSizeSmallShift;

// Page sizes
const size_t      ZPageSizeSmall                = (size_t)1 << ZPageSizeSmallShift;
const size_t      ZPageSizeMedium               = (size_t)1 << ZPageSizeMediumShift;
const size_t      ZPageSizeMin                  = (size_t)1 << ZPageSizeMinShift;

// Object size limits
const size_t      ZObjectSizeLimitSmall         = (ZPageSizeSmall / 8);  // Allow 12.5% waste
const size_t      ZObjectSizeLimitMedium        = (ZPageSizeMedium / 8); // Allow 12.5% waste

// Object alignment shifts
extern const int& ZObjectAlignmentSmallShift;
const int         ZObjectAlignmentMediumShift   = ZPageSizeMediumShift - 13; // 8192 objects per page
const int         ZObjectAlignmentLargeShift    = ZPageSizeSmallShift;

// Object alignments
extern const int& ZObjectAlignmentSmall;
const int         ZObjectAlignmentMedium        = 1 << ZObjectAlignmentMediumShift;
const int         ZObjectAlignmentLarge         = 1 << ZObjectAlignmentLargeShift;

// Pointer part of address
const uintptr_t   ZAddressOffsetShift           = 0;
const uintptr_t   ZAddressOffsetBits            = ZPlatformAddressOffsetBits;
const uintptr_t   ZAddressOffsetMask            = (((uintptr_t)1 << ZAddressOffsetBits) - 1) << ZAddressOffsetShift;
const size_t      ZAddressOffsetMax             = (uintptr_t)1 << ZAddressOffsetBits;

// Metadata part of address
const uintptr_t   ZAddressMetadataShift         = ZPlatformAddressMetadataShift;
const uintptr_t   ZAddressMetadataBits          = 4;
const uintptr_t   ZAddressMetadataMask          = (((uintptr_t)1 << ZAddressMetadataBits) - 1) << ZAddressMetadataShift;

// Metadata types
const uintptr_t   ZAddressMetadataMarked0       = (uintptr_t)1 << (ZAddressMetadataShift + 0);
const uintptr_t   ZAddressMetadataMarked1       = (uintptr_t)1 << (ZAddressMetadataShift + 1);
const uintptr_t   ZAddressMetadataRemapped      = (uintptr_t)1 << (ZAddressMetadataShift + 2);
const uintptr_t   ZAddressMetadataFinalizable   = (uintptr_t)1 << (ZAddressMetadataShift + 3);

// Address space start/end/size
const uintptr_t   ZAddressSpaceStart            = ZPlatformAddressSpaceStart;
const uintptr_t   ZAddressSpaceSize             = ZPlatformAddressSpaceSize;
const uintptr_t   ZAddressSpaceEnd              = ZAddressSpaceStart + ZAddressSpaceSize;

// Cache line size
const size_t      ZCacheLineSize                = ZPlatformCacheLineSize;

// Reserved start/end
uintptr_t ZAddressReservedStart();
uintptr_t ZAddressReservedEnd();

//
// Good/Bad mask states
// --------------------
//
//                 GoodMask         BadMask          WeakGoodMask     WeakBadMask
//                 --------------------------------------------------------------
//  Marked0        001              110              101              010
//  Marked1        010              101              110              001
//  Remapped       100              011              100              011
//

// Good/bad masks
extern uintptr_t  ZAddressGoodMask;
extern uintptr_t  ZAddressBadMask;
extern uintptr_t  ZAddressWeakBadMask;

// Marked state
extern uintptr_t  ZAddressMetadataMarked;

// Address space for mark stack allocations
const size_t      ZMarkStackSpaceSizeShift      = 40; // 1TB
const size_t      ZMarkStackSpaceSize           = (size_t)1 << ZMarkStackSpaceSizeShift;
const uintptr_t   ZMarkStackSpaceStart          = ZAddressSpaceEnd + ZMarkStackSpaceSize;
const uintptr_t   ZMarkStackSpaceEnd            = ZMarkStackSpaceStart + ZMarkStackSpaceSize;
const size_t      ZMarkStackSpaceExpandSize     = (size_t)1 << 25; // 32M

// Mark stack and magazine sizes
const size_t      ZMarkStackSizeShift           = 11; // 2K
const size_t      ZMarkStackSize                = (size_t)1 << ZMarkStackSizeShift;
const size_t      ZMarkStackHeaderSize          = (size_t)1 << 4; // 16B
const size_t      ZMarkStackSlots               = (ZMarkStackSize - ZMarkStackHeaderSize) / sizeof(uintptr_t);
const size_t      ZMarkStackMagazineSize        = (size_t)1 << 15; // 32K
const size_t      ZMarkStackMagazineSlots       = (ZMarkStackMagazineSize / ZMarkStackSize) - 1;

// Mark stripe size
const size_t      ZMarkStripeShift              = ZPageSizeMinShift;

// Max number of mark stripes
const size_t      ZMarkStripesMax               = 16; // Must be a power of two

// Mark cache size
const size_t      ZMarkCacheSize                = 1024; // Must be a power of two

// Partial array minimum size
const size_t      ZMarkPartialArrayMinSizeShift = 12; // 4K
const size_t      ZMarkPartialArrayMinSize      = (size_t)1 << ZMarkPartialArrayMinSizeShift;

// Max number of proactive/terminate flush attempts
const size_t      ZMarkProactiveFlushMax        = 10;
const size_t      ZMarkTerminateFlushMax        = 3;

// Try complete mark timeout
const uint64_t    ZMarkCompleteTimeout          = 1; // ms

#endif // SHARE_GC_Z_ZGLOBALS_HPP