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

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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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 CPU_HEADER(gc/z/zGlobals)

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

// Granule shift/size
const size_t      ZGranuleSizeShift             = 21; // 2MB
const size_t      ZGranuleSize                  = (size_t)1 << ZGranuleSizeShift;

// Virtual memory to physical memory ratio
const size_t      ZVirtualToPhysicalRatio       = 16; // 16:1

// Max virtual memory ranges
const size_t      ZMaxVirtualReservations       = 100; // Each reservation at least 1% of total

// Page size shifts
const size_t      ZPageSizeSmallShift           = ZGranuleSizeShift;
extern size_t     ZPageSizeMediumShift;

// Page sizes
const size_t      ZPageSizeSmall                = (size_t)1 << ZPageSizeSmallShift;
extern size_t     ZPageSizeMedium;

// Object size limits
const size_t      ZObjectSizeLimitSmall         = ZPageSizeSmall / 8; // 12.5% max waste
extern size_t     ZObjectSizeLimitMedium;

// Object alignment shifts
extern const int& ZObjectAlignmentSmallShift;
extern int        ZObjectAlignmentMediumShift;
const int         ZObjectAlignmentLargeShift    = ZGranuleSizeShift;

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

// Cache line size
const size_t      ZCacheLineSize                = ZPlatformCacheLineSize;
#define           ZCACHE_ALIGNED                ATTRIBUTE_ALIGNED(ZCacheLineSize)

// Mark stack space
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              = ZGranuleSizeShift;

// 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;
const size_t      ZMarkPartialArrayMinLength    = ZMarkPartialArrayMinSize / oopSize;

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

// Try complete mark timeout
const uint64_t    ZMarkCompleteTimeout          = 200; // us

#endif // SHARE_GC_Z_ZGLOBALS_HPP