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// 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 "monitoring/perf_level_imp.h"
#include "monitoring/statistics.h"
#include "rocksdb/system_clock.h"
namespace ROCKSDB_NAMESPACE {
class PerfStepTimer {
public:
explicit PerfStepTimer(
uint64_t* metric, SystemClock* clock = nullptr, bool use_cpu_time = false,
PerfLevel enable_level = PerfLevel::kEnableTimeExceptForMutex,
Statistics* statistics = nullptr, uint32_t ticker_type = 0)
: perf_counter_enabled_(perf_level >= enable_level),
use_cpu_time_(use_cpu_time),
ticker_type_(ticker_type),
clock_((perf_counter_enabled_ || statistics != nullptr)
? (clock ? clock : SystemClock::Default().get())
: nullptr),
start_(0),
metric_(metric),
statistics_(statistics) {}
~PerfStepTimer() { Stop(); }
void Start() {
if (perf_counter_enabled_ || statistics_ != nullptr) {
start_ = time_now();
}
}
void Measure() {
if (start_) {
uint64_t now = time_now();
*metric_ += now - start_;
start_ = now;
}
}
void Stop() {
if (start_) {
uint64_t duration = time_now() - start_;
if (perf_counter_enabled_) {
*metric_ += duration;
}
if (statistics_ != nullptr) {
RecordTick(statistics_, ticker_type_, duration);
}
start_ = 0;
}
}
private:
uint64_t time_now() {
if (!use_cpu_time_) {
return clock_->NowNanos();
} else {
return clock_->CPUNanos();
}
}
const bool perf_counter_enabled_;
const bool use_cpu_time_;
uint32_t ticker_type_;
SystemClock* const clock_;
uint64_t start_;
uint64_t* metric_;
Statistics* statistics_;
};
} // namespace ROCKSDB_NAMESPACE
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