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Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/file/readahead_file_info.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/rocksdb/file/readahead_file_info.h b/src/rocksdb/file/readahead_file_info.h new file mode 100644 index 000000000..f0208bf2d --- /dev/null +++ b/src/rocksdb/file/readahead_file_info.h @@ -0,0 +1,33 @@ +// 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 |