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317 lines
13 KiB
C
317 lines
13 KiB
C
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//
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// Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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//
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#ifndef SYSTEM_WRAPPERS_INCLUDE_METRICS_H_
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#define SYSTEM_WRAPPERS_INCLUDE_METRICS_H_
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#include <map>
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#include <memory>
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#include <string>
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//#include "common_types.h" // NOLINT(build/include)
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#include "rtc_base/atomicops.h"
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#include "rtc_base/checks.h"
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// Macros for allowing WebRTC clients (e.g. Chrome) to gather and aggregate
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// statistics.
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//
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// Histogram for counters.
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// RTC_HISTOGRAM_COUNTS(name, sample, min, max, bucket_count);
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//
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// Histogram for enumerators.
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// The boundary should be above the max enumerator sample.
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// RTC_HISTOGRAM_ENUMERATION(name, sample, boundary);
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//
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//
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// The macros use the methods HistogramFactoryGetCounts,
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// HistogramFactoryGetEnumeration and HistogramAdd.
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//
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// By default WebRTC provides implementations of the aforementioned methods
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// that can be found in system_wrappers/source/metrics.cc. If clients want to
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// provide a custom version, they will have to:
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//
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// 1. Compile WebRTC defining the preprocessor macro
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// WEBRTC_EXCLUDE_METRICS_DEFAULT (if GN is used this can be achieved
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// by setting the GN arg rtc_exclude_metrics_default to true).
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// 2. Provide implementations of:
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// Histogram* webrtc::metrics::HistogramFactoryGetCounts(
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// const std::string& name, int sample, int min, int max,
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// int bucket_count);
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// Histogram* webrtc::metrics::HistogramFactoryGetEnumeration(
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// const std::string& name, int sample, int boundary);
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// void webrtc::metrics::HistogramAdd(
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// Histogram* histogram_pointer, const std::string& name, int sample);
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//
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// Example usage:
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//
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// RTC_HISTOGRAM_COUNTS("WebRTC.Video.NacksSent", nacks_sent, 1, 100000, 100);
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//
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// enum Types {
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// kTypeX,
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// kTypeY,
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// kBoundary,
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// };
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//
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// RTC_HISTOGRAM_ENUMERATION("WebRTC.Types", kTypeX, kBoundary);
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//
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// NOTE: It is recommended to do the Chromium review for modifications to
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// histograms.xml before new metrics are committed to WebRTC.
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// Macros for adding samples to a named histogram.
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// Histogram for counters (exponentially spaced buckets).
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#define RTC_HISTOGRAM_COUNTS_100(name, sample) \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 100, 50)
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#define RTC_HISTOGRAM_COUNTS_200(name, sample) \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 200, 50)
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#define RTC_HISTOGRAM_COUNTS_500(name, sample) \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 500, 50)
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#define RTC_HISTOGRAM_COUNTS_1000(name, sample) \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 1000, 50)
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#define RTC_HISTOGRAM_COUNTS_10000(name, sample) \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 10000, 50)
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#define RTC_HISTOGRAM_COUNTS_100000(name, sample) \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 100000, 50)
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#define RTC_HISTOGRAM_COUNTS(name, sample, min, max, bucket_count) \
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RTC_HISTOGRAM_COMMON_BLOCK(name, sample, \
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webrtc::metrics::HistogramFactoryGetCounts( \
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name, min, max, bucket_count))
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#define RTC_HISTOGRAM_COUNTS_LINEAR(name, sample, min, max, bucket_count) \
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RTC_HISTOGRAM_COMMON_BLOCK(name, sample, \
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webrtc::metrics::HistogramFactoryGetCountsLinear( \
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name, min, max, bucket_count))
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// Slow metrics: pointer to metric is acquired at each call and is not cached.
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//
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#define RTC_HISTOGRAM_COUNTS_SPARSE_100(name, sample) \
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RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, 1, 100, 50)
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#define RTC_HISTOGRAM_COUNTS_SPARSE_200(name, sample) \
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RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, 1, 200, 50)
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#define RTC_HISTOGRAM_COUNTS_SPARSE_500(name, sample) \
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RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, 1, 500, 50)
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#define RTC_HISTOGRAM_COUNTS_SPARSE_1000(name, sample) \
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RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, 1, 1000, 50)
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#define RTC_HISTOGRAM_COUNTS_SPARSE_10000(name, sample) \
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RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, 1, 10000, 50)
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#define RTC_HISTOGRAM_COUNTS_SPARSE_100000(name, sample) \
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RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, 1, 100000, 50)
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#define RTC_HISTOGRAM_COUNTS_SPARSE(name, sample, min, max, bucket_count) \
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RTC_HISTOGRAM_COMMON_BLOCK_SLOW(name, sample, \
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webrtc::metrics::HistogramFactoryGetCounts( \
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name, min, max, bucket_count))
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// Histogram for percentage (evenly spaced buckets).
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#define RTC_HISTOGRAM_PERCENTAGE_SPARSE(name, sample) \
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RTC_HISTOGRAM_ENUMERATION_SPARSE(name, sample, 101)
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// Histogram for booleans.
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#define RTC_HISTOGRAM_BOOLEAN_SPARSE(name, sample) \
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RTC_HISTOGRAM_ENUMERATION_SPARSE(name, sample, 2)
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// Histogram for enumerators (evenly spaced buckets).
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// |boundary| should be above the max enumerator sample.
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//
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// TODO(qingsi): Refactor the default implementation given by RtcHistogram,
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// which is already sparse, and remove the boundary argument from the macro.
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#define RTC_HISTOGRAM_ENUMERATION_SPARSE(name, sample, boundary) \
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RTC_HISTOGRAM_COMMON_BLOCK( \
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name, sample, \
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webrtc::metrics::SparseHistogramFactoryGetEnumeration(name, boundary))
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// Histogram for percentage (evenly spaced buckets).
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#define RTC_HISTOGRAM_PERCENTAGE(name, sample) \
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RTC_HISTOGRAM_ENUMERATION(name, sample, 101)
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// Histogram for booleans.
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#define RTC_HISTOGRAM_BOOLEAN(name, sample) \
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RTC_HISTOGRAM_ENUMERATION(name, sample, 2)
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// Histogram for enumerators (evenly spaced buckets).
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// |boundary| should be above the max enumerator sample.
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#define RTC_HISTOGRAM_ENUMERATION(name, sample, boundary) \
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RTC_HISTOGRAM_COMMON_BLOCK( \
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name, sample, \
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webrtc::metrics::HistogramFactoryGetEnumeration(name, boundary))
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// The name of the histogram should not vary.
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// TODO(asapersson): Consider changing string to const char*.
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#define RTC_HISTOGRAM_COMMON_BLOCK(constant_name, sample, \
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factory_get_invocation) \
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do { \
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static webrtc::metrics::Histogram* atomic_histogram_pointer = nullptr; \
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webrtc::metrics::Histogram* histogram_pointer = \
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rtc::AtomicOps::AcquireLoadPtr(&atomic_histogram_pointer); \
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if (!histogram_pointer) { \
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histogram_pointer = factory_get_invocation; \
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webrtc::metrics::Histogram* prev_pointer = \
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rtc::AtomicOps::CompareAndSwapPtr( \
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&atomic_histogram_pointer, \
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static_cast<webrtc::metrics::Histogram*>(nullptr), \
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histogram_pointer); \
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RTC_DCHECK(prev_pointer == nullptr || \
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prev_pointer == histogram_pointer); \
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} \
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if (histogram_pointer) { \
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webrtc::metrics::HistogramAdd(histogram_pointer, sample); \
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} \
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} while (0)
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// Deprecated.
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// The histogram is constructed/found for each call.
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// May be used for histograms with infrequent updates.`
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#define RTC_HISTOGRAM_COMMON_BLOCK_SLOW(name, sample, factory_get_invocation) \
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do { \
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webrtc::metrics::Histogram* histogram_pointer = factory_get_invocation; \
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if (histogram_pointer) { \
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webrtc::metrics::HistogramAdd(histogram_pointer, sample); \
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} \
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} while (0)
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// Helper macros.
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// Macros for calling a histogram with varying name (e.g. when using a metric
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// in different modes such as real-time vs screenshare). Fast, because pointer
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// is cached. |index| should be different for different names. Allowed |index|
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// values are 0, 1, and 2.
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#define RTC_HISTOGRAMS_COUNTS_100(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 100, 50))
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#define RTC_HISTOGRAMS_COUNTS_200(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 200, 50))
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#define RTC_HISTOGRAMS_COUNTS_500(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 500, 50))
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#define RTC_HISTOGRAMS_COUNTS_1000(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 1000, 50))
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#define RTC_HISTOGRAMS_COUNTS_10000(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 10000, 50))
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#define RTC_HISTOGRAMS_COUNTS_100000(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_COUNTS(name, sample, 1, 100000, 50))
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#define RTC_HISTOGRAMS_ENUMERATION(index, name, sample, boundary) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_ENUMERATION(name, sample, boundary))
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#define RTC_HISTOGRAMS_PERCENTAGE(index, name, sample) \
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RTC_HISTOGRAMS_COMMON(index, name, sample, \
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RTC_HISTOGRAM_PERCENTAGE(name, sample))
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#define RTC_HISTOGRAMS_COMMON(index, name, sample, macro_invocation) \
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do { \
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switch (index) { \
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case 0: \
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macro_invocation; \
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break; \
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case 1: \
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macro_invocation; \
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break; \
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case 2: \
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macro_invocation; \
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break; \
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default: \
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RTC_NOTREACHED(); \
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} \
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} while (0)
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namespace webrtc {
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namespace metrics {
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// Time that should have elapsed for stats that are gathered once per call.
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enum { kMinRunTimeInSeconds = 10 };
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class Histogram;
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// Functions for getting pointer to histogram (constructs or finds the named
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// histogram).
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// Get histogram for counters.
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Histogram* HistogramFactoryGetCounts(const std::string& name,
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int min,
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int max,
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int bucket_count);
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// Get histogram for counters with linear bucket spacing.
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Histogram* HistogramFactoryGetCountsLinear(const std::string& name,
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int min,
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int max,
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int bucket_count);
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// Get histogram for enumerators.
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// |boundary| should be above the max enumerator sample.
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Histogram* HistogramFactoryGetEnumeration(const std::string& name,
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int boundary);
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// Get sparse histogram for enumerators.
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// |boundary| should be above the max enumerator sample.
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Histogram* SparseHistogramFactoryGetEnumeration(const std::string& name,
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int boundary);
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// Function for adding a |sample| to a histogram.
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void HistogramAdd(Histogram* histogram_pointer, int sample);
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struct SampleInfo {
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SampleInfo(const std::string& name, int min, int max, size_t bucket_count);
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~SampleInfo();
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const std::string name;
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const int min;
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const int max;
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const size_t bucket_count;
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std::map<int, int> samples; // <value, # of events>
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};
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// Enables collection of samples.
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// This method should be called before any other call into webrtc.
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void Enable();
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// Gets histograms and clears all samples.
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void GetAndReset(
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std::map<std::string, std::unique_ptr<SampleInfo>>* histograms);
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// Functions below are mainly for testing.
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// Clears all samples.
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void Reset();
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// Returns the number of times the |sample| has been added to the histogram.
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int NumEvents(const std::string& name, int sample);
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// Returns the total number of added samples to the histogram.
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int NumSamples(const std::string& name);
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// Returns the minimum sample value (or -1 if the histogram has no samples).
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int MinSample(const std::string& name);
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} // namespace metrics
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} // namespace webrtc
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#endif // SYSTEM_WRAPPERS_INCLUDE_METRICS_H_
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