For #10434: Handle cases when proc/$pid/stat is not accessible.
parent
0df27742a3
commit
2090b11c97
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@ -2253,6 +2253,22 @@ startup.timeline:
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- perf-android-fe@mozilla.com
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- mcomella@mozilla.com
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expires: "2020-07-15"
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framework_start_read_error:
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send_in_pings:
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- startup-timeline
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type: boolean
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description: |
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An error when attempting to read stats from /proc pseudo-filesystem -
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privacy managers can block access to reading these files -
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the application will catch a file reading exception.
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bugs:
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- https://github.com/mozilla-mobile/fenix/issues/10434
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data_reviews:
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- https://github.com/mozilla-mobile/fenix/pull/10481
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notification_emails:
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- perf-android-fe@mozilla.com
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- mcomella@mozilla.com
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expires: "2020-07-15"
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clock_ticks_per_second:
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send_in_pings:
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- startup-timeline
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@ -6,6 +6,7 @@ package org.mozilla.fenix.perf
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import android.os.Process
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import android.os.SystemClock
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import java.io.FileNotFoundException
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import kotlin.math.roundToLong
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import org.mozilla.fenix.GleanMetrics.StartupTimeline as Telemetry
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@ -53,14 +54,23 @@ internal class StartupFrameworkStartMeasurement(
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if (applicationInitNanos < 0) {
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telemetry.frameworkStartError.set(true)
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} else {
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try {
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telemetry.frameworkStart.setRawNanos(getFrameworkStartNanos())
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} catch (e: FileNotFoundException) {
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// Privacy managers can add hooks that block access to reading system /proc files.
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// We want to catch these exception and report an error on accessing the file
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// rather than an implementation error.
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telemetry.frameworkStartReadError.set(true)
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}
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// frameworkStart is derived from the number of clock ticks per second. To ensure this
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// value does not throw off our result, we capture it too.
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telemetry.clockTicksPerSecond.add(stat.clockTicksPerSecond.toInt())
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}
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}
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/**
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* @throws [java.io.FileNotFoundException]
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*/
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private fun getFrameworkStartNanos(): Long {
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// Get our timestamps in ticks: we expect ticks to be less granular than nanoseconds so,
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// to ensure our measurement uses the correct number of significant figures, we convert
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@ -24,6 +24,9 @@ private const val FIELD_POS_STARTTIME = 21 // starttime naming matches field in
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*/
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open class Stat {
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/**
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* @throws [java.io.FileNotFoundException]
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*/
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@VisibleForTesting(otherwise = PRIVATE)
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open fun getStatText(pid: Int): String = File("/proc/$pid/stat").readText()
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