MemoryCountersMetric | API reference | Android Developers (original) (raw)
@ExperimentalMetricApi
public final class MemoryCountersMetric extends TraceMetric
Captures the number of page faults over time for a target package name.
Summary
Public constructors
MemoryCountersMetric
public MemoryCountersMetric(
@NonNull String processNameSuffix,
@NonNull String metricNameSuffix
)
| Parameters | |
|---|---|
| @NonNull String processNameSuffix | A suffix appended to the app's package name for subprocesses. This is useful when there are separate subprocesses of the app. |
| @NonNull String metricNameSuffix | A suffix appended to the metric names. Use this to distinguish metrics collected from different subprocesses in the app. Defaults to processNameSuffix with ":" replaced by "_". |
Public methods
getMeasurements
public @NonNull List<@NonNull Metric.Measurement> getMeasurements(
@NonNull Metric.CaptureInfo captureInfo,
@NonNull TraceProcessor.Session traceSession
)
Get the metric result for a given iteration given information about the target process and a TraceProcessor session
import androidx.benchmark.macro.ExperimentalMetricApi import androidx.benchmark.macro.TraceMetric import androidx.benchmark.traceprocessor.TraceProcessor
/**
- Calculates latency of sections where begin and end trace points are in different processes.
- @param beginPointName Name of begin tracepoint.
- @param endPointName Name of end tracepoint.
- @param eventName Name of the final metric that is spit out after the test run. The metric
- name will be {$eventName}LatencyMillis. */ @OptIn(ExperimentalMetricApi::class) class CrossProcessLatencyMetricSample( private val beginPointName: String, private val endPointName: String, private val eventName: String, ) : TraceMetric() { @OptIn(ExperimentalMetricApi::class) override fun getMeasurements( captureInfo: CaptureInfo, traceSession: TraceProcessor.Session, ): List { val query = """ INCLUDE perfetto module slices.with_context; SELECT event, ts2-ts1 AS latency_in_nanos FROM ( (SELECT ts AS ts1, "event" AS event, LOWER(TRIM(process_name)) as process_name_1 FROM thread_slice WHERE name = '${beginPointName}' ) LEFT JOIN (SELECT ts AS ts2, "event" AS event, LOWER(TRIM(process_name)) as process_name_2 FROM thread_slice WHERE name = '${endPointName}' ) USING (event) ) """ .trimIndent() // maybe add checks for process name etc too in query val rowSequence = traceSession.query(query) // First row (or null) is returned. val latencyResultNanos = rowSequence.firstOrNull()?.long("latency_in_nanos") return if (latencyResultNanos != null) { listOf(Measurement(eventName + "LatencyMillis", latencyResultNanos / 1_000_000.0)) } else { emptyList() }
}}
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Last updated 2026-03-25 UTC.