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#!/bin/sh
# HAHAHAH Bro it finally works. It fucking works. It finally fucking works.
# It just needs to monitor IO with iotop and start killing firefox processes
# from the bottom (least memory usage) up. This allows any one tab access to the
# full memory available to Firefox! And integrate it into the your-fired.sh
# script. And it's truly fixed. And integrate the firefox updater.
IO_ROOT_DIR=$HOME/.cache/mozilla/firefox/
[ -d "$IO_ROOT_DIR" ] || exit
get_age()
{
local mtime now
mtime=$(stat --format=%Y "$1") || return
now=$(date +%s) || return
echo $(( now - mtime ))
}
get_filesystem()
{
echo /
}
get_total_memory()
{
free -b | {
read _
read _ total _
echo $total
}
}
math()
{
printf '%s\n' "$*" | bc -lq
}
get_total_io()
{
results=$IO_ROOT_DIR/io.test.result
zeroes=$IO_ROOT_DIR/io.test
if [ -e "$results" ]
then
age=$(get_age "$results") || return
if [ "$age" -gt $((60 * 60 * 24 * 7)) ]
then
rm "$results"
fi
fi
if ! [ -e "$results" ]
then
MEGS=128
then=$(date +%s.%N) || return
dd if=/dev/zero of="$zeroes" bs=${MEGS}M count=1 || return
now=$(date +%s.%N) || return
rm "$zeroes"
speed=$(math $now - $then / $((MEGS * 1024 * 1024))) || return
echo $speed > "$results"
fi
read total < "$results" || return
echo ${total%.*}
}
root_write()
{
$AS_ROOT sh -c 'cat > "$1"' sh "$1"
}
join_group()
{
GROUP_DIR=/sys/fs/cgroup/"$1"
[ -d "$GROUP_DIR" ] || $AS_ROOT mkdir "$GROUP_DIR"
echo $$ | root_write "$GROUP_DIR"/cgroup.procs
}
add_subtree_controller()
{
local group="$1" controller="$2" control_file
control_file=$(realpath -e "/sys/fs/cgroup/$group/cgroup.subtree_control") || return
case "$control_file" in
/sys/fs/cgroup/cgroup.subtree_control) ;;
*) add_subtree_controller "$group"/.. "$2" ;;
esac
[ "$1" ] && [ "$2" ] && [ -e "$control_file" ] || return
if ! grep -q "\\b${controller}\\b" "$control_file"
then
echo +"$controller" | root_write "$control_file"
fi
}
set_max()
{
add_subtree_controller "$1"/.. "$2"
[ -e "$GROUP_DIR"/"$2".max ] || return
printf '%s\n' "$3" | root_write "$GROUP_DIR"/"$2".max
}
set_max_ratio()
{
local group="$1" controller="$2" ratio="$3" limit
total=$(get_total_$controller)
n=${ratio%%/*}
d=${ratio#$n/}
[ "$d" = "${d%/*}" ] || return
limit=$(( total * n / d ))
[ "$limit" ] || return
[ "$limit" -gt 0 ] || return
case "$controller" in
io)
fsroot=$(get_filesystem "$IO_ROOT_DIR") || return
majmin=$(lsblk -o 'MOUNTPOINT,MAJ:MIN' | sed -ne "s?^$fsroot *??p") || return
case "$majmin" in
*:*) ;;
*) return 1 ;;
esac
set_max "$group" "$controller" "$majmin wbps=$limit rbps=$limit"
;;
*) set_max "$group" "$controller" "$limit"
esac
}
get_current_group()
{
read g < /proc/$$/cgroup
echo ${g#0::/}
}
set -e
[ "$(id -un)" = 0 ] && AS_ROOT= || AS_ROOT='sudo --'
group=user.slice/user-$(id -u).slice/firefox
join_group "$group"
set_max_ratio "$group" memory 1/2
set_max_ratio "$group" io 9/10
exec firefox "$@"
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