From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:54:28 +0200 Subject: Adding upstream version 18.2.2. Signed-off-by: Daniel Baumann --- src/rocksdb/monitoring/file_read_sample.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 src/rocksdb/monitoring/file_read_sample.h (limited to 'src/rocksdb/monitoring/file_read_sample.h') diff --git a/src/rocksdb/monitoring/file_read_sample.h b/src/rocksdb/monitoring/file_read_sample.h new file mode 100644 index 000000000..82a933e0a --- /dev/null +++ b/src/rocksdb/monitoring/file_read_sample.h @@ -0,0 +1,23 @@ +// 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 "db/version_edit.h" +#include "util/random.h" + +namespace ROCKSDB_NAMESPACE { +static const uint32_t kFileReadSampleRate = 1024; +extern bool should_sample_file_read(); +extern void sample_file_read_inc(FileMetaData*); + +inline bool should_sample_file_read() { + return (Random::GetTLSInstance()->Next() % kFileReadSampleRate == 307); +} + +inline void sample_file_read_inc(FileMetaData* meta) { + meta->stats.num_reads_sampled.fetch_add(kFileReadSampleRate, + std::memory_order_relaxed); +} +} // namespace ROCKSDB_NAMESPACE -- cgit v1.2.3