enoch/armbian-build
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Introduce MEM_LIMIT_PERCENTAGE variable for zram

Browse Source 
(defaulting to 50% so zram will not use more than this treshold anyway
This commit is contained in:
Thomas Kaiser 2018-09-24 15:48:57 +02:00
parent c1530db482
commit 9688c96a04
2 changed files with 14 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
packages/bsp/common/etc/default/armbian-zram-config.dpkg-dist
View File

@ -3,11 +3,18 @@
# enable the armbian-zram-config service?
ENABLED=true
# percentage of zram usage compared to physically available DRAM.
# percentage of zram used as swap compared to physically available DRAM.
# Huge overcommitment (300) is possible and sometimes desirable. See
# https://forum.armbian.com/topic/5565-zram-vs-swap/?do=findComment&comment=61082
# and don't forget to adjust $MEM_LIMIT_PERCENTAGE below too.
# ZRAM_PERCENTAGE=50
# percentage of DRAM available to zram. If this amount is exceeded the zram
# devices used for swap simply behave as if the device is full. You need to
# adjust/increase this value only if you want to work with massive memory
# overcommitment (ZRAM_PERCENTAGE exceeding 150 for example)
# MEM_LIMIT_PERCENTAGE=50
# create how many zram devices max for swap
# ZRAM_MAX_DEVICES=4

7
packages/bsp/common/usr/lib/armbian/armbian-zram-config
View File

@ -35,16 +35,21 @@ activate_zram_swap() {
module_args="$(modinfo zram | awk -F" " '/num_devices/ {print $2}' | cut -f1 -d:)"
[[ -n ${module_args} ]] && modprobe zram ${module_args}=$(( ${zram_devices} + 2 )) || return
# Use 50% of real memory by default
# Expose 50% of real memory as swap space by default
zram_percent=${ZRAM_PERCENTAGE:=50}
mem_info=$(LC_ALL=C free -w 2>/dev/null | grep "^Mem" || LC_ALL=C free | grep "^Mem")
memory_total=$(awk '{printf("%d",$2*1024)}' <<<${mem_info})
mem_per_zram_device=$(( ${memory_total} / ${zram_devices} * ${zram_percent} / 100 ))
# Limit memory available to zram to 50% by default
mem_limit_percent=${MEM_LIMIT_PERCENTAGE:=50}
mem_limit_per_zram_device=$(( ${memory_total} / ${zram_devices} * ${mem_limit_percent} / 100 ))
swap_algo=${SWAP_ALGORITHM:=lzo}
for (( i=1; i<=zram_devices; i++ )); do
[[ -f /sys/block/zram${i}/comp_algorithm ]] && echo ${swap_algo} >/sys/block/zram${i}/comp_algorithm 2>/dev/null
echo -n ${mem_per_zram_device} > /sys/block/zram${i}/disksize
echo -n ${mem_limit_per_zram_device} > /sys/block/zram${i}/mem_limit
mkswap /dev/zram${i}
swapon -p 5 /dev/zram${i}
done