mirror of https://github.com/facebook/rocksdb.git
34 lines
1.0 KiB
C
34 lines
1.0 KiB
C
|
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
||
|
|
// This source code is licensed under both the GPLv2 (found in the
|
||
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
||
|
|
// (found in the LICENSE.Apache file in the root directory).
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <cstddef>
|
||
|
|
#include <cstdint>
|
||
|
|
|
||
|
|
#include "rocksdb/rocksdb_namespace.h"
|
||
|
|
|
||
|
|
namespace ROCKSDB_NAMESPACE {
|
||
|
|
|
||
|
|
// struct ReadaheadFileInfo contains readahead information that is passed from
|
||
|
|
// one file to another file per level during iterations. This information helps
|
||
|
|
// iterators to carry forward the internal automatic prefetching readahead value
|
||
|
|
// to next file during sequential reads instead of starting from the scratch.
|
||
|
|
|
||
|
|
struct ReadaheadFileInfo {
|
||
|
|
struct ReadaheadInfo {
|
||
|
|
size_t readahead_size = 0;
|
||
|
|
int64_t num_file_reads = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Used by Data block iterators to update readahead info.
|
||
|
|
ReadaheadInfo data_block_readahead_info;
|
||
|
|
|
||
|
|
// Used by Index block iterators to update readahead info.
|
||
|
|
ReadaheadInfo index_block_readahead_info;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace ROCKSDB_NAMESPACE
|