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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zencore/intmath.h>
#include <zencore/memory/align.h>
#include <zencore/memory/mallocmimalloc.h>
#if ZEN_MIMALLOC_ENABLED
# include <mimalloc.h>
/** Value we fill a memory block with after it is free, in UE_BUILD_DEBUG **/
# define DEBUG_FILL_FREED (0xdd)
/** Value we fill a new memory block with, in UE_BUILD_DEBUG **/
# define DEBUG_FILL_NEW (0xcd)
# define ZEN_ENABLE_DEBUG_FILL 1
namespace zen {
// Dramatically reduce memory zeroing and page faults during alloc intense workloads
// by keeping freed pages for a little while instead of releasing them
// right away to the OS, effectively acting like a scratch buffer
// until pages are both freed and inactive for the delay specified
// in milliseconds.
int32_t GMiMallocMemoryResetDelay = 10000;
FMallocMimalloc::FMallocMimalloc()
{
mi_option_set(mi_option_reset_delay, GMiMallocMemoryResetDelay);
}
void*
FMallocMimalloc::TryMalloc(size_t Size, uint32_t Alignment)
{
void* NewPtr = nullptr;
if (Alignment != DEFAULT_ALIGNMENT)
{
Alignment = Max(uint32_t(Size >= 16 ? 16 : 8), Alignment);
NewPtr = mi_malloc_aligned(Size, Alignment);
}
else
{
NewPtr = mi_malloc_aligned(Size, uint32_t(Size >= 16 ? 16 : 8));
}
# if ZEN_BUILD_DEBUG && ZEN_ENABLE_DEBUG_FILL
if (Size && NewPtr != nullptr)
{
memset(NewPtr, DEBUG_FILL_NEW, mi_usable_size(NewPtr));
}
# endif
return NewPtr;
}
void*
FMallocMimalloc::Malloc(size_t Size, uint32_t Alignment)
{
void* Result = TryMalloc(Size, Alignment);
if (Result == nullptr && Size)
{
OutOfMemory(Size, Alignment);
}
return Result;
}
void*
FMallocMimalloc::TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment)
{
# if ZEN_BUILD_DEBUG && ZEN_ENABLE_DEBUG_FILL
size_t OldSize = 0;
if (Ptr)
{
OldSize = mi_malloc_size(Ptr);
if (NewSize < OldSize)
{
memset((uint8_t*)Ptr + NewSize, DEBUG_FILL_FREED, OldSize - NewSize);
}
}
# endif
void* NewPtr = nullptr;
if (NewSize == 0)
{
mi_free(Ptr);
return nullptr;
}
# if ZEN_PLATFORM_MAC
// macOS expects all allocations to be aligned to 16 bytes, so on Mac we always have to use mi_realloc_aligned
Alignment = AlignArbitrary(Max((uint32_t)16, Alignment), (uint32_t)16);
NewPtr = mi_realloc_aligned(Ptr, NewSize, Alignment);
# else
if (Alignment != DEFAULT_ALIGNMENT)
{
Alignment = Max(NewSize >= 16 ? (uint32_t)16 : (uint32_t)8, Alignment);
NewPtr = mi_realloc_aligned(Ptr, NewSize, Alignment);
}
else
{
NewPtr = mi_realloc(Ptr, NewSize);
}
# endif
# if ZEN_BUILD_DEBUG && ZEN_ENABLE_DEBUG_FILL
if (NewPtr && NewSize > OldSize)
{
memset((uint8_t*)NewPtr + OldSize, DEBUG_FILL_NEW, mi_usable_size(NewPtr) - OldSize);
}
# endif
return NewPtr;
}
void*
FMallocMimalloc::Realloc(void* Ptr, size_t NewSize, uint32_t Alignment)
{
void* Result = TryRealloc(Ptr, NewSize, Alignment);
if (Result == nullptr && NewSize)
{
OutOfMemory(NewSize, Alignment);
}
return Result;
}
void
FMallocMimalloc::Free(void* Ptr)
{
if (!Ptr)
{
return;
}
# if ZEN_BUILD_DEBUG && ZEN_ENABLE_DEBUG_FILL
memset(Ptr, DEBUG_FILL_FREED, mi_usable_size(Ptr));
# endif
mi_free(Ptr);
}
void*
FMallocMimalloc::MallocZeroed(size_t Size, uint32_t Alignment)
{
void* Result = TryMallocZeroed(Size, Alignment);
if (Result == nullptr && Size)
{
OutOfMemory(Size, Alignment);
}
return Result;
}
void*
FMallocMimalloc::TryMallocZeroed(size_t Size, uint32_t Alignment)
{
void* NewPtr = nullptr;
if (Alignment != DEFAULT_ALIGNMENT)
{
Alignment = Max(uint32_t(Size >= 16 ? 16 : 8), Alignment);
NewPtr = mi_zalloc_aligned(Size, Alignment);
}
else
{
NewPtr = mi_zalloc_aligned(Size, uint32_t(Size >= 16 ? 16 : 8));
}
return NewPtr;
}
bool
FMallocMimalloc::GetAllocationSize(void* Original, size_t& SizeOut)
{
SizeOut = mi_malloc_size(Original);
return true;
}
void
FMallocMimalloc::Trim(bool bTrimThreadCaches)
{
mi_collect(bTrimThreadCaches);
}
# undef DEBUG_FILL_FREED
# undef DEBUG_FILL_NEW
} // namespace zen
#endif // MIMALLOC_ENABLED
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