a14b7873ee
Summary: Introduces a new class for managing write buffer memory across column families. We supplement ColumnFamilyOptions::write_buffer_size with ColumnFamilyOptions::write_buffer, a shared pointer to a WriteBuffer instance that enforces memory limits before flushing out to disk. Test Plan: Added SharedWriteBuffer unit test to db_test.cc Reviewers: sdong, rven, ljin, igor Reviewed By: igor Subscribers: tnovak, yhchiang, dhruba, xjin, MarkCallaghan, yoshinorim Differential Revision: https://reviews.facebook.net/D22581
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include <assert.h>
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#include "db/memtable_allocator.h"
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#include "db/writebuffer.h"
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#include "util/arena.h"
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namespace rocksdb {
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MemTableAllocator::MemTableAllocator(Arena* arena, WriteBuffer* write_buffer)
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: arena_(arena), write_buffer_(write_buffer), bytes_allocated_(0) {
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}
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MemTableAllocator::~MemTableAllocator() {
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DoneAllocating();
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}
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char* MemTableAllocator::Allocate(size_t bytes) {
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assert(write_buffer_ != nullptr);
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bytes_allocated_ += bytes;
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write_buffer_->ReserveMem(bytes);
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return arena_->Allocate(bytes);
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}
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char* MemTableAllocator::AllocateAligned(size_t bytes, size_t huge_page_size,
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Logger* logger) {
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assert(write_buffer_ != nullptr);
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bytes_allocated_ += bytes;
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write_buffer_->ReserveMem(bytes);
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return arena_->AllocateAligned(bytes, huge_page_size, logger);
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}
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void MemTableAllocator::DoneAllocating() {
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if (write_buffer_ != nullptr) {
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write_buffer_->FreeMem(bytes_allocated_);
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write_buffer_ = nullptr;
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}
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}
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size_t MemTableAllocator::BlockSize() const {
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return arena_->BlockSize();
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}
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} // namespace rocksdb
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