Notes

# Set Memory paremeters.
#
# Set per_process_reclaim tuning parameters
# 2GB 64-bit will have aggressive settings when compared to 1GB 32-bit
# 1GB and less will use vmpressure range 50-70, 2GB will use 10-70
# 1GB and less will use 512 pages swap size, 2GB will use 1024
#
# Set Low memory killer minfree parameters
# 32 bit all memory configurations will use 15K series
# 64 bit up to 2GB with use 14K, and above 2GB will use 18K
#
# Set ALMK parameters (usually above the highest minfree values)
# 32 bit will have 53K & 64 bit will have 81K
#
arch_type=`uname -m`
MemTotalStr=`cat /proc/meminfo | grep MemTotal`
MemTotal=${MemTotalStr:16:8}

# Read adj series and set adj threshold for PPR and ALMK.
# This is required since adj values change from framework to framework.
adj_series=`cat /sys/module/lowmemorykiller/parameters/adj`
adj_1="${adj_series#*,}"
set_almk_ppr_adj="${adj_1%%,*}"

# PPR and ALMK should not act on HOME adj and below.
# Normalized ADJ for HOME is 6. Hence multiply by 6
# ADJ score represented as INT in LMK params, actual score can be in decimal
# Hence add 6 considering a worst case of 0.9 conversion to INT (0.9*6).
# For uLMK + Memcg, this will be set as 6 since adj is zero.
set_almk_ppr_adj=$(((set_almk_ppr_adj * 6) + 6))
echo $set_almk_ppr_adj > /sys/module/lowmemorykiller/parameters/adj_max_shift
echo $set_almk_ppr_adj > /sys/module/process_reclaim/parameters/min_score_adj

#Set other memory parameters
echo 1 > /sys/module/process_reclaim/parameters/enable_process_reclaim
echo 70 > /sys/module/process_reclaim/parameters/pressure_max
echo 30 > /sys/module/process_reclaim/parameters/swap_opt_eff
echo 1 > /sys/module/lowmemorykiller/parameters/enable_adaptive_lmk
if [ $MemTotal -gt 2097152 ]; then
echo 10 > /sys/module/process_reclaim/parameters/pressure_min
echo 1024 > /sys/module/process_reclaim/parameters/per_swap_size
echo "18432,23040,27648,32256,55296,80640" > /sys/module/lowmemorykiller/parameters/minfree
echo 81250 > /sys/module/lowmemorykiller/parameters/vmpressure_file_min
elif [ $MemTotal -gt 1048576 ]; then
echo 10 > /sys/module/process_reclaim/parameters/pressure_min
echo 1024 > /sys/module/process_reclaim/parameters/per_swap_size
echo "14746,18432,22118,25805,40000,55000" > /sys/module/lowmemorykiller/parameters/minfree
echo 81250 > /sys/module/lowmemorykiller/parameters/vmpressure_file_min
else
echo 50 > /sys/module/process_reclaim/parameters/pressure_min
echo 512 > /sys/module/process_reclaim/parameters/per_swap_size
echo "14746,18432,22118,25805,40000,55000" > /sys/module/lowmemorykiller/parameters/minfree
echo 81250 > /sys/module/lowmemorykiller/parameters/vmpressure_file_min
fi