arc/container/scripts/arc-ureadahead.conf

# Copyright 2016 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description   "Run ureadahead for ARC++"
author        "chromium-os-dev@chromium.org"

# Run this job in parallel with arc_setup_wrapper.sh run_oci hook. The job
# shouldn't be started until 'ureadahead' (which may be in tracing mode)
# is stopped, otherwise ureadahead may corrupt the $PACK file. Depending
# on start-arc-instance ensures that.
start on start-arc-instance

import DISABLE_UREADAHEAD

# 'never' since terminating this job after it starts can cause ARC boot failure.
oom score never

script
  {
    PACK=/opt/google/containers/android/ureadahead.pack

    echo "Start arc-ureadahead"
    set -x

    # Read-ahead files in the image.
    if [ "${HOST_UREADAHEAD_MODE}" = "DISABLED" ]; then
      logger -t "${UPSTART_JOB}" "Ureadahead is disabled."
    elif [ "${HOST_UREADAHEAD_MODE}" = "GENERATE" ]; then
      logger -t "${UPSTART_JOB}" "Ureadahead is in generate mode."
    elif [ "${HOST_UREADAHEAD_MODE}" = "DEFAULT" ]; then
      if [ -f "${PACK}" ]; then
        ureadahead --pack-file="${PACK}" ||
        echo "Failed to start ureadahead pack for ${PACK}"
      else
        echo "ureadahead pack is not available at ${PACK}"
      fi
    else
      echo "ureadahead mode is invalid ${HOST_UREADAHEAD_MODE}"
    fi
  } 2>&1 | logger -t "${UPSTART_JOB}"
end script