bca632d4f6
This installs zram-init and sets it to start on boot for all
devices/UIs. The included conf.d/zram-init also allows diabling using
zram swap or overriding the size by using a deviceinfo var.
I did an analysis of the pmos base install size with the 'none' UI
selected, after depending on zram-init, and the following new package is
installed:
zram-init-11.1-r1 installed size: 40 KiB
These packages are dependencies of zram-init, however they are already
installed in the base image (with 'none' UI) so they are not counted
above:
util-linux-misc-2.38.1-r0 installed size: 6816 KiB
e2fsprogs-extra-1.46.5-r4 installed size: 1324 KiB
So this seems like a very small price to pay for the benefit of not
making the logic/implementation more complicated than this.
* Starting busybox syslog ... [ ok ]
ssh-keygen: generating new host keys: RSA ECDSA ED25519
* Starting sshd ... [ ok ]
zram swap: activating with size: 243 MB
* Loading zram module...
[ ok ]
* Swap->zram0
[ ok ]
* Starting local ... [ ok ]
This change introduces one new deviceinfo variable:
deviceinfo_zram_swap_pct: percentage of RAM to use for zram swap
Default percentages if the second var is unset are explained in the
zram-init file this commit adds. A value of 0 disables zram swap.
fixes #1133
55 lines
1.8 KiB
Text
55 lines
1.8 KiB
Text
. /etc/deviceinfo
|
|
|
|
# Size defaults to:
|
|
# - 75% of RAM for devices with 2GB of RAM or less
|
|
# - 50% of RAM for devices with between 2GB and 6GB of RAM
|
|
# - 25% of RAM for devices with greater 6GB of RAM
|
|
# This is loosely based on some data here:
|
|
# https://gitlab.com/postmarketOS/pmaports/-/merge_requests/3752#note_1229631449
|
|
|
|
_mem_size_mb="$(LC_ALL=C free -m | awk '/^Mem:/{print $2}')"
|
|
|
|
if [ $_mem_size_mb -le 2048 ]; then
|
|
_size_pct=75
|
|
elif [ $_mem_size_mb -gt 6144 ]; then
|
|
_size_pct=25
|
|
else
|
|
_size_pct=50
|
|
fi
|
|
|
|
# Allow overriding the size as a percentage of RAM using a deviceinfo var, or
|
|
# disabling it completely
|
|
if [ -n "$deviceinfo_zram_swap_pct" ]; then
|
|
|
|
# 0% --> disable zram swap
|
|
if [ "$deviceinfo_zram_swap_pct" == "0" ]; then
|
|
echo "zram swap: disabled in deviceinfo, exiting"
|
|
exit 0
|
|
fi
|
|
|
|
_size_pct="$deviceinfo_zram_swap_pct"
|
|
fi
|
|
|
|
size0=$(($_mem_size_mb * $_size_pct / 100))
|
|
|
|
echo "zram swap: activating with size: $size0 MB"
|
|
# zstd (since linux-4.18), lz4 (since linux-3.15), or lzo.
|
|
# Size: zstd (best) > lzo > lz4. Speed: lz4 (best) > zstd > lzo
|
|
algo0=zstd
|
|
|
|
# The following are defaults from the zram-init package:
|
|
load_on_start=yes
|
|
unload_on_stop=yes
|
|
num_devices=1
|
|
type0=swap
|
|
flag0= # The default "16383" is fine for us
|
|
mlim0= # no hard memory limit
|
|
back0= # no backup device
|
|
icmp0= # no incompressible page writing to backup device
|
|
idle0= # no idle page writing to backup device
|
|
wlim0= # no writeback_limit for idle page writing for backup device
|
|
notr0= # keep the default on linux-3.15 or newer
|
|
maxs0=1 # maximum number of parallel processes for this device
|
|
labl0=zram_swap # the label name
|
|
uuid0= # Do not force UUID
|
|
args0= # we could e.g. have set args0="-L 'zram_swap'" instead of using labl0
|