ad0c3747cb
Summary: as title Test Plan: asan_check will post results later Reviewers: haobo, igor, dhruba, sdong Reviewed By: haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D16257
67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
// Copyright (c) 2013, 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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#pragma once
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#include "rocksdb/statistics.h"
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#include "util/histogram.h"
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#include "util/mutexlock.h"
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#include "port/likely.h"
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#include <vector>
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#include <atomic>
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namespace rocksdb {
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class StatisticsImpl : public Statistics {
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public:
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StatisticsImpl();
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virtual ~StatisticsImpl();
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virtual long getTickerCount(Tickers tickerType);
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virtual void setTickerCount(Tickers tickerType, uint64_t count);
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virtual void recordTick(Tickers tickerType, uint64_t count);
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virtual void measureTime(Histograms histogramType, uint64_t value);
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virtual void histogramData(Histograms histogramType,
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HistogramData* const data);
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private:
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struct Ticker {
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Ticker() : value(uint_fast64_t()) {}
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std::atomic_uint_fast64_t value;
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// Pad the structure to make it size of 64 bytes. A plain array of
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// std::atomic_uint_fast64_t results in huge performance degradataion
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// due to false sharing.
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char padding[64 - sizeof(std::atomic_uint_fast64_t)];
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};
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Ticker tickers_[TICKER_ENUM_MAX] __attribute__((aligned(64)));
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HistogramImpl histograms_[HISTOGRAM_ENUM_MAX] __attribute__((aligned(64)));
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};
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// Utility functions
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inline void MeasureTime(Statistics* statistics, Histograms histogramType,
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uint64_t value) {
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if (statistics) {
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statistics->measureTime(histogramType, value);
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}
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}
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inline void RecordTick(Statistics* statistics, Tickers ticker,
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uint64_t count = 1) {
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if (statistics) {
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statistics->recordTick(ticker, count);
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}
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}
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inline void SetTickerCount(Statistics* statistics, Tickers ticker,
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uint64_t count) {
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if (statistics) {
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statistics->setTickerCount(ticker, count);
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}
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}
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}
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