rocksdb/db/memtable_allocator.cc

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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include <assert.h>
#include "db/memtable_allocator.h"
#include "db/writebuffer.h"
#include "util/arena.h"
namespace rocksdb {
MemTableAllocator::MemTableAllocator(Arena* arena, WriteBuffer* write_buffer)
: arena_(arena), write_buffer_(write_buffer), bytes_allocated_(0) {
}
MemTableAllocator::~MemTableAllocator() {
DoneAllocating();
}
char* MemTableAllocator::Allocate(size_t bytes) {
assert(write_buffer_ != nullptr);
bytes_allocated_ += bytes;
write_buffer_->ReserveMem(bytes);
return arena_->Allocate(bytes);
}
char* MemTableAllocator::AllocateAligned(size_t bytes, size_t huge_page_size,
Logger* logger) {
assert(write_buffer_ != nullptr);
bytes_allocated_ += bytes;
write_buffer_->ReserveMem(bytes);
return arena_->AllocateAligned(bytes, huge_page_size, logger);
}
void MemTableAllocator::DoneAllocating() {
if (write_buffer_ != nullptr) {
write_buffer_->FreeMem(bytes_allocated_);
write_buffer_ = nullptr;
}
}
size_t MemTableAllocator::BlockSize() const {
return arena_->BlockSize();
}
} // namespace rocksdb