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#include "chunked_memory_allocator.h"
#include "serialize.h"
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
const i64 TChunkedMemoryAllocator::DefaultChunkSize = 4096;
const double TChunkedMemoryAllocator::DefaultMaxSmallBlockSizeRatio = 0.25;
////////////////////////////////////////////////////////////////////////////////
TChunkedMemoryAllocator::TChunkedMemoryAllocator(
i64 chunkSize,
double maxSmallBlockSizeRatio,
TRefCountedTypeCookie tagCookie)
: ChunkSize_(chunkSize)
, MaxSmallBlockSize_(static_cast<i64>(ChunkSize_ * maxSmallBlockSizeRatio))
, TagCookie_(tagCookie)
{ }
TSharedMutableRef TChunkedMemoryAllocator::AllocateUnalignedSlow(i64 size)
{
auto large = AllocateSlowCore(size);
if (large) {
return large;
}
return AllocateUnaligned(size);
}
TSharedMutableRef TChunkedMemoryAllocator::AllocateAlignedSlow(i64 size, int align)
{
// NB: Do not rely on any particular alignment of chunks.
auto large = AllocateSlowCore(size + align);
if (large) {
auto* alignedBegin = AlignUp(large.Begin(), align);
return large.Slice(alignedBegin, alignedBegin + size);
}
return AllocateAligned(size, align);
}
TSharedMutableRef TChunkedMemoryAllocator::AllocateSlowCore(i64 size)
{
if (size > MaxSmallBlockSize_) {
return TSharedMutableRef::Allocate(size, {.InitializeStorage = false}, TagCookie_);
}
Chunk_ = TSharedMutableRef::Allocate(ChunkSize_, {.InitializeStorage = false}, TagCookie_);
FreeZoneBegin_ = Chunk_.Begin();
FreeZoneEnd_ = Chunk_.End();
return TSharedMutableRef();
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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