Android Perfetto 系列 15：Boot Trace、长时刻现场 Trace 与偶发问题抓取

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adb push field.pbtxt /data/misc/perfetto-configs/field.pbtxt

PID=$(adb shell perfetto --background-wait --txt \
  -c /data/misc/perfetto-configs/field.pbtxt \
  -o /data/misc/perfetto-traces/field.perfetto-trace | tr -d '\r')

echo "perfetto pid: $PID"

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PID=$(adb shell perfetto --background-wait --txt \
  -c - \
  -o /data/misc/perfetto-traces/field.perfetto-trace tr -d '\r')

echo "perfetto pid: $PID"

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case "$PID" in
  ''|*[!0-9]*) echo "Invalid perfetto PID" >&2; exit 1 ;;
esac
[ "$PID" -gt 1 ] || exit 1
adb shell "kill -INT $PID" || exit 1
adb shell "attempts=0; while kill -0 $PID 2>/dev/null; do
  attempts=\$((attempts + 1))
  [ \$attempts -lt 60 ] || exit 1
  sleep 1
done" || exit 1
adb shell '
  path=/data/misc/perfetto-traces/field.perfetto-trace
  stable=0
  prev=0
  attempts=0
  while [ "$stable" -lt 3 ] && [ "$attempts" -lt 60 ]; do
    attempts=$((attempts + 1))
    size=$(stat -c %s "$path" 2>/dev/null || echo 0)
    if [ "$size" -gt 0 ] && [ "$size" = "$prev" ]; then
      stable=$((stable + 1))
    else
      stable=0
    fi
    prev=$size
    sleep 1
  done
  [ "$stable" -ge 3 ] || { echo "Trace missing or not stable" >&2; exit 1; }
' || exit 1

adb pull /data/misc/perfetto-traces/field.perfetto-trace

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{
  "event_id": "evt-20260504-153012-001",
  "trigger_name": "app_ui_jank",
  "trigger_source": "app_jankstats",
  "page": "Feed",
  "action": "scroll",
  "reason": "slow_frame",
  "threshold_ms": 50,
  "observed_value_ms": 83.4,
  "window_start_elapsed_ns": 123456700000000,
  "window_end_elapsed_ns": 123456789000000,
  "dedupe_key": "Feed:scroll:slow_frame:202605041530",
  "sample_decision": "record",
  "app_state": "foreground"
}

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adb shell /system/bin/trigger_perfetto app_ui_jank