rocksdb/monitoring/perf_step_timer.h

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#pragma once
#include "monitoring/perf_level_imp.h"
#include "rocksdb/env.h"
#include "util/stop_watch.h"
namespace rocksdb {
class PerfStepTimer {
public:
explicit PerfStepTimer(uint64_t* metric, bool for_mutex = false)
: enabled_(perf_level >= PerfLevel::kEnableTime ||
(!for_mutex && perf_level >= kEnableTimeExceptForMutex)),
env_(enabled_ ? Env::Default() : nullptr),
start_(0),
metric_(metric) {}
~PerfStepTimer() {
Stop();
}
void Start() {
if (enabled_) {
start_ = env_->NowNanos();
}
}
void Measure() {
if (start_) {
uint64_t now = env_->NowNanos();
*metric_ += now - start_;
start_ = now;
}
}
void Stop() {
if (start_) {
*metric_ += env_->NowNanos() - start_;
start_ = 0;
}
}
private:
const bool enabled_;
Env* const env_;
uint64_t start_;
uint64_t* metric_;
};
} // namespace rocksdb