8673a8c567
Summary: Closes https://github.com/facebook/rocksdb/pull/2589 Differential Revision: D5431502 Pulled By: siying fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75
116 lines
3.8 KiB
C++
116 lines
3.8 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 "rocksdb/statistics.h"
|
|
|
|
#include <vector>
|
|
#include <atomic>
|
|
#include <string>
|
|
|
|
#include "monitoring/histogram.h"
|
|
#include "port/likely.h"
|
|
#include "port/port.h"
|
|
#include "util/core_local.h"
|
|
#include "util/mutexlock.h"
|
|
|
|
#ifdef __clang__
|
|
#define ROCKSDB_FIELD_UNUSED __attribute__((__unused__))
|
|
#else
|
|
#define ROCKSDB_FIELD_UNUSED
|
|
#endif // __clang__
|
|
|
|
namespace rocksdb {
|
|
|
|
enum TickersInternal : uint32_t {
|
|
INTERNAL_TICKER_ENUM_START = TICKER_ENUM_MAX,
|
|
INTERNAL_TICKER_ENUM_MAX
|
|
};
|
|
|
|
enum HistogramsInternal : uint32_t {
|
|
INTERNAL_HISTOGRAM_START = HISTOGRAM_ENUM_MAX,
|
|
INTERNAL_HISTOGRAM_ENUM_MAX
|
|
};
|
|
|
|
|
|
class StatisticsImpl : public Statistics {
|
|
public:
|
|
StatisticsImpl(std::shared_ptr<Statistics> stats,
|
|
bool enable_internal_stats);
|
|
virtual ~StatisticsImpl();
|
|
|
|
virtual uint64_t getTickerCount(uint32_t ticker_type) const override;
|
|
virtual void histogramData(uint32_t histogram_type,
|
|
HistogramData* const data) const override;
|
|
std::string getHistogramString(uint32_t histogram_type) const override;
|
|
|
|
virtual void setTickerCount(uint32_t ticker_type, uint64_t count) override;
|
|
virtual uint64_t getAndResetTickerCount(uint32_t ticker_type) override;
|
|
virtual void recordTick(uint32_t ticker_type, uint64_t count) override;
|
|
virtual void measureTime(uint32_t histogram_type, uint64_t value) override;
|
|
|
|
virtual Status Reset() override;
|
|
virtual std::string ToString() const override;
|
|
virtual bool HistEnabledForType(uint32_t type) const override;
|
|
|
|
private:
|
|
// If non-nullptr, forwards updates to the object pointed to by `stats_`.
|
|
std::shared_ptr<Statistics> stats_;
|
|
// TODO(ajkr): clean this up since there are no internal stats anymore
|
|
bool enable_internal_stats_;
|
|
// Synchronizes anything that operates across other cores' local data,
|
|
// such that operations like Reset() can be performed atomically.
|
|
mutable port::Mutex aggregate_lock_;
|
|
|
|
// The ticker/histogram data are stored in this structure, which we will store
|
|
// per-core. It is cache-aligned, so tickers/histograms belonging to different
|
|
// cores can never share the same cache line.
|
|
//
|
|
// Alignment attributes expand to nothing depending on the platform
|
|
struct StatisticsData {
|
|
std::atomic_uint_fast64_t tickers_[INTERNAL_TICKER_ENUM_MAX] = {{0}};
|
|
HistogramImpl histograms_[INTERNAL_HISTOGRAM_ENUM_MAX];
|
|
char
|
|
padding[(CACHE_LINE_SIZE -
|
|
(INTERNAL_TICKER_ENUM_MAX * sizeof(std::atomic_uint_fast64_t) +
|
|
INTERNAL_HISTOGRAM_ENUM_MAX * sizeof(HistogramImpl)) %
|
|
CACHE_LINE_SIZE) %
|
|
CACHE_LINE_SIZE] ROCKSDB_FIELD_UNUSED;
|
|
};
|
|
|
|
static_assert(sizeof(StatisticsData) % 64 == 0, "Expected 64-byte aligned");
|
|
|
|
CoreLocalArray<StatisticsData> per_core_stats_;
|
|
|
|
uint64_t getTickerCountLocked(uint32_t ticker_type) const;
|
|
std::unique_ptr<HistogramImpl> getHistogramImplLocked(
|
|
uint32_t histogram_type) const;
|
|
void setTickerCountLocked(uint32_t ticker_type, uint64_t count);
|
|
};
|
|
|
|
// Utility functions
|
|
inline void MeasureTime(Statistics* statistics, uint32_t histogram_type,
|
|
uint64_t value) {
|
|
if (statistics) {
|
|
statistics->measureTime(histogram_type, value);
|
|
}
|
|
}
|
|
|
|
inline void RecordTick(Statistics* statistics, uint32_t ticker_type,
|
|
uint64_t count = 1) {
|
|
if (statistics) {
|
|
statistics->recordTick(ticker_type, count);
|
|
}
|
|
}
|
|
|
|
inline void SetTickerCount(Statistics* statistics, uint32_t ticker_type,
|
|
uint64_t count) {
|
|
if (statistics) {
|
|
statistics->setTickerCount(ticker_type, count);
|
|
}
|
|
}
|
|
|
|
}
|