6580fdc5be
Prefetching appears to have a slightly negative effect on boot time, and actually makes boot time much worse when the available dm-bufio cache shrinks. Since we anticipate the dm-bufio cache will shrink (because of an increasing number of APEX dm-verity targets), disable prefetching completely. Boot time w/o this change: 12.085 Boot time with this change: 11.958 Boot time w/o this change with 128kB dm-bufio cache: 22.82 Boot time with this change with 128kB dm-bufio cache: 12.007 Test: atest google/perf/boottime/boottime-test Bug: 136247322 Change-Id: I12e342c5692fa89855d9c217f2e94287ff5642a6
35 lines
1.7 KiB
Text
35 lines
1.7 KiB
Text
# Copyright (c) 2020, The Linux Foundation. All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above
|
|
# copyright notice, this list of conditions and the following
|
|
# disclaimer in the documentation and/or other materials provided
|
|
# with the distribution.
|
|
# * Neither the name of The Linux Foundation nor the names of its
|
|
# contributors may be used to endorse or promote products derived
|
|
# from this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
|
|
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
|
|
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
|
|
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
|
|
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
#
|
|
#
|
|
|
|
on early-init
|
|
write /sys/module/dm_verity/parameters/prefetch_cluster 0
|
|
|
|
on early-boot
|
|
# Update dm-verity state and set partition.*.verified properties
|
|
verity_update_state
|