MallocTimer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
#include "CoreTypes.h"
#include "HAL/CriticalSection.h"
#include "HAL/PlatformTime.h"
 
#ifndef UE_TIME_VIRTUALMALLOC
#define UE_TIME_VIRTUALMALLOC 0
#endif
 
struct FScopedVirtualMallocTimer
{
    enum IndexType : int32
    {
        Reserve,
        Commit,
        Combined,
        DeCommit,
        Free,
 
        Max
    };
 
    enum PlatormIndexType : int32
    {
        OrdinaryCPU, // General memory
        GPU_WriteCombine, // XALLOC_MEMTYPE_GRAPHICS_COMMAND_BUFFER_WRITECOMBINE and XALLOC_MEMTYPE_GRAPHICS_WRITECOMBINE
        GPU_Cacheable, // XALLOC_MEMTYPE_GRAPHICS_CACHEABLE
        GPU_WriteCombineRenderTarget, // Similar to GPU_WriteCombine, but with 4MB pages and up to 128K alignment, no small block allocator
        PlatormIndexTypeMax
    };
 
#if UE_TIME_VIRTUALMALLOC
    static uint64 GTotalCycles[IndexType::Max][PlatormIndexType::PlatormIndexTypeMax];
    static uint64 GTotalCounts[IndexType::Max][PlatormIndexType::PlatormIndexTypeMax];
 
    int32 Index;
    int32 PlatformTypeIndex;
    uint64 Cycles;
 
    FORCEINLINE FScopedVirtualMallocTimer(int32 InIndex = 0, int32 InPlatformTypeIndex = 0)
        : Index(InIndex)
        , PlatformTypeIndex(InPlatformTypeIndex)
        , Cycles(FPlatformTime::Cycles64())
    {
        FPlatformAtomics::InterlockedIncrement((volatile int64*)&GTotalCounts[InIndex][InPlatformTypeIndex]);
    }
    FORCEINLINE ~FScopedVirtualMallocTimer()
    {
        uint64 Add = uint64(FPlatformTime::Cycles64() - Cycles);
        FPlatformAtomics::InterlockedAdd((volatile int64*)&GTotalCycles[Index][PlatformTypeIndex], Add);
    }
 
    static void UpdateStats();
#else   //UE_TIME_VIRTUALMALLOC
    FORCEINLINE FScopedVirtualMallocTimer(int32 InIndex = 0, int32 InPlatformTypeIndex = 0)
    {
    }
    FORCEINLINE ~FScopedVirtualMallocTimer()
    {
    }
    static FORCEINLINE void UpdateStats()
    {
    }
#endif  //UE_TIME_VIRTUALMALLOC
};