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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_RESOURCE_ATTRIBUTION_QUERY_RESULTS_H_
#define COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_RESOURCE_ATTRIBUTION_QUERY_RESULTS_H_
#include <compare>
#include <map>
#include <optional>
#include "base/byte_count.h"
#include "base/time/time.h"
#include "components/performance_manager/public/resource_attribution/resource_contexts.h"
#include "components/performance_manager/public/resource_attribution/resource_types.h"
namespace resource_attribution {
// The Resource Attribution result and metadata structs described in
// https://bit.ly/resource-attribution-api#heading=h.k8fjwkwxxdj6.
// The methods used to produce a result.
enum class MeasurementAlgorithm {
// The values in this result were measured directly, such as with an
// OS system call.
kDirectMeasurement,
// The values in this result are estimates derived by subdividing direct
// measurements of a context between several related contexts, such as with
// SplitResourceAmongFramesAndWorkers().
kSplit,
// The values in this result are estimates derived by summing kSplit estimates
// over a collection of contexts.
kSum,
};
// Metadata about the measurement that produced a result.
struct ResultMetadata {
// The time this measurement was taken.
base::TimeTicks measurement_time;
// Method used to assign measurement results to the resource context.
MeasurementAlgorithm algorithm;
// Constructor ensures both `measurement_time` and `algorithm` are set.
//
// Since there's no default constructor, any ResultType class containing
// metadata also can't be default-constructed. This ensures none of them have
// an invalid or uninitialized state. Use std::optional<ResultType> when
// default-construction is needed.
ResultMetadata(base::TimeTicks measurement_time,
MeasurementAlgorithm algorithm)
: measurement_time(measurement_time), algorithm(algorithm) {}
friend constexpr auto operator<=>(const ResultMetadata&,
const ResultMetadata&) = default;
friend constexpr bool operator==(const ResultMetadata&,
const ResultMetadata&) = default;
};
// The result of a kCPUTime query.
struct CPUTimeResult {
ResultMetadata metadata;
// The time that Resource Attribution started monitoring the CPU usage of this
// context.
base::TimeTicks start_time;
// Total time the context spent on CPU between `start_time` and
// `metadata.measurement_time`.
//
// `cumulative_cpu` / (`metadata.measurement_time` - `start_time`)
// gives percentage of CPU used as a fraction in the range 0% to 100% *
// SysInfo::NumberOfProcessors(), the same as
// ProcessMetrics::GetPlatformIndependentCPUUsage().
base::TimeDelta cumulative_cpu;
// Total time the context spent on CPU in a background process between
// `start_time` and `metadata.measurement_time`. Time spent on CPU in a
// foreground process doesn't affect this, even if the context itself was
// backgrounded.
base::TimeDelta cumulative_background_cpu;
friend constexpr auto operator<=>(const CPUTimeResult&,
const CPUTimeResult&) = default;
friend constexpr bool operator==(const CPUTimeResult&,
const CPUTimeResult&) = default;
};
// Results of a kMemorySummary query.
struct MemorySummaryResult {
ResultMetadata metadata;
base::ByteCount resident_set_size;
base::ByteCount private_footprint;
friend constexpr auto operator<=>(const MemorySummaryResult&,
const MemorySummaryResult&) = default;
friend constexpr bool operator==(const MemorySummaryResult&,
const MemorySummaryResult&) = default;
};
// A container for at most one of each query result type. This is not a variant
// because it can contain more than one result.
struct QueryResults {
std::optional<CPUTimeResult> cpu_time_result;
std::optional<MemorySummaryResult> memory_summary_result;
friend constexpr auto operator<=>(const QueryResults&,
const QueryResults&) = default;
friend constexpr bool operator==(const QueryResults&,
const QueryResults&) = default;
};
// A map from a ResourceContext to all query results received for that context.
using QueryResultMap = std::map<ResourceContext, QueryResults>;
} // namespace resource_attribution
#endif // COMPONENTS_PERFORMANCE_MANAGER_PUBLIC_RESOURCE_ATTRIBUTION_QUERY_RESULTS_H_
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