sapling/eden/fs/fuse/EdenStats.cpp

/*
 *  Copyright (c) 2016-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.
 *
 */
#include "EdenStats.h"

#include <folly/container/Array.h>
#include <chrono>

using namespace folly;
using namespace std::chrono;

namespace {
constexpr std::chrono::microseconds kMinValue{0};
constexpr std::chrono::microseconds kMaxValue{10000};
constexpr std::chrono::microseconds kBucketSize{1000};
constexpr unsigned int kNumTimeseriesBuckets{60};
constexpr auto kDurations = folly::make_array(
    std::chrono::seconds(60),
    std::chrono::seconds(600),
    std::chrono::seconds(3600),
    std::chrono::seconds(0));
} // namespace

namespace facebook {
namespace eden {
namespace fusell {

EdenStats::EdenStats() {}

#if EDEN_HAS_COMMON_STATS
EdenStats::Histogram EdenStats::createHistogram(const std::string& name) {
  return Histogram{this,
                   name,
                   kBucketSize.count(),
                   kMinValue.count(),
                   kMaxValue.count(),
                   facebook::stats::COUNT,
                   50,
                   90,
                   99};
}

#else

folly::TimeseriesHistogram<int64_t> EdenStats::createHistogram(
    const std::string& /* name */) {
  return folly::TimeseriesHistogram<int64_t>{
      kBucketSize.count(),
      kMinValue.count(),
      kMaxValue.count(),
      MultiLevelTimeSeries<int64_t>{
          kNumTimeseriesBuckets, kDurations.size(), kDurations.data()}};
}
#endif

void EdenStats::recordLatency(
    HistogramPtr item,
    std::chrono::microseconds elapsed,
    std::chrono::seconds now) {
#if EDEN_HAS_COMMON_STATS
  (void)now; // we don't use it in this code path
  (this->*item).addValue(elapsed.count());
#else
  (this->*item)->addValue(now, elapsed.count());
#endif
}
} // namespace fusell
} // namespace eden
} // namespace facebook