rocksdb/db/memtable_allocator.cc
sdong 32df9733d1 Add options.write_buffer_manager: control total memtable size across DB instances
Summary: Add option write_buffer_manager to help users control total memory spent on memtables across multiple DB instances.

Test Plan: Add a new unit test.

Reviewers: yhchiang, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: adela, benj, sumeet, muthu, leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D59925
2016-07-05 18:11:25 -07:00

52 lines
1.9 KiB
C++

// Copyright (c) 2011-present, 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 "db/memtable_allocator.h"
#include <assert.h>
#include "rocksdb/write_buffer_manager.h"
#include "util/arena.h"
namespace rocksdb {
MemTableAllocator::MemTableAllocator(Allocator* allocator,
WriteBufferManager* write_buffer_manager)
: allocator_(allocator),
write_buffer_manager_(write_buffer_manager),
bytes_allocated_(0) {}
MemTableAllocator::~MemTableAllocator() { DoneAllocating(); }
char* MemTableAllocator::Allocate(size_t bytes) {
assert(write_buffer_manager_ != nullptr);
bytes_allocated_.fetch_add(bytes, std::memory_order_relaxed);
write_buffer_manager_->ReserveMem(bytes);
return allocator_->Allocate(bytes);
}
char* MemTableAllocator::AllocateAligned(size_t bytes, size_t huge_page_size,
Logger* logger) {
assert(write_buffer_manager_ != nullptr);
bytes_allocated_.fetch_add(bytes, std::memory_order_relaxed);
write_buffer_manager_->ReserveMem(bytes);
return allocator_->AllocateAligned(bytes, huge_page_size, logger);
}
void MemTableAllocator::DoneAllocating() {
if (write_buffer_manager_ != nullptr) {
write_buffer_manager_->FreeMem(
bytes_allocated_.load(std::memory_order_relaxed));
write_buffer_manager_ = nullptr;
}
}
size_t MemTableAllocator::BlockSize() const { return allocator_->BlockSize(); }
} // namespace rocksdb