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Full rewrite, simplify code & config
Signed-off-by: Timofey Titovets <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,45 @@ | ||
| ################################################################################ | ||
| # Defaults are optimized for general usage | ||
| ################################################################################ | ||
|
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| ################################################################################ | ||
| # Zswap | ||
| # | ||
| # Kernel >= 3.11 | ||
| # Zswap create compress cache between swap and memory for reduce IO | ||
| # https://www.kernel.org/doc/Documentation/vm/zswap.txt | ||
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| zswap_enabled=Y | ||
| zswap_compressor=lz4 | ||
| zswap_max_pool_percent=25 | ||
| zswap_zpool=z3fold | ||
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| ################################################################################ | ||
| # ZRam | ||
| # | ||
| # Kernel >= 3.15 | ||
| # Zram compression streams count for additional information see: | ||
| # https://www.kernel.org/doc/Documentation/blockdev/zram.txt | ||
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| zram_enabled=0 | ||
| zram_size=$(($ram_size/4))K # This is 1/4 of ram size by default. | ||
| zram_streams=$cpu_count | ||
| zram_alg=lz4 # lzo lz4 deflate lz4hc 842 - for Linux 4.8.4 | ||
| zram_prio=32767 | ||
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| ################################################################################ | ||
| # Swap file Universal | ||
| # loop + swapfile = support any fs (also btrfs) | ||
| swapfu_enabled=0 | ||
| # File is sparse and dynamically allocated. | ||
| swapfu_size=${ram_size}K # Size of swap file. | ||
| # File will not be available in fs after script start | ||
| # Make sure what script can access to this path during the boot process. | ||
| # Full path to swapfile | ||
| swapfu_path=/var/swap | ||
| swapfu_prio=-1024 | ||
|
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||
| ################################################################################ | ||
| # Swap devices | ||
| # Find and auto swapon all available swap devices | ||
| swapd_auto_swapon=1 |
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| Original file line number | Diff line number | Diff line change |
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| #!/bin/bash | ||
| ################################################################################ | ||
| # echo wrappers | ||
| INFO(){ echo -n "INFO: "; echo "$@" ;} | ||
| WARN(){ echo -n "WARN: "; echo "$@" ;} | ||
| ERRO(){ echo -n "ERRO: "; echo -n "$@" ; echo " Abort!"; exit 1;} | ||
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| ################################################################################ | ||
| # Helpers | ||
| YN(){ | ||
| case "$1" in | ||
| Yes|Y|1|true) return 0 ;; | ||
| *) return 1 ;; | ||
| esac | ||
| } | ||
|
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||
| write(){ | ||
| DATA="$1" FILE="$2" | ||
| [ -z "$DATA" ] && return | ||
| [ -z "$FILE" ] && return | ||
| echo "$DATA" > "$FILE" | ||
| } | ||
|
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||
| help(){ | ||
| echo "$0 start|stop" | ||
| } | ||
| ################################################################################ | ||
| # Initialization | ||
| check_root_rights(){ [ "$UID" == "0" ] || ERRO "Script must be runned as root!"; } | ||
|
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| # get cpu count from cpuinfo | ||
| cpu_count=$(nproc) | ||
| # get total ram size for meminfo | ||
| ram_size=$(awk '/MemTotal:/ { print $2 }' /proc/meminfo) | ||
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| WORK_DIR=/run/systemd/swap | ||
| TMPDIR=$WORK_DIR | ||
| CONF=/etc/systemd/swap.conf | ||
| B_CONF=$WORK_DIR/swap.conf | ||
|
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||
| case "$1" in | ||
| start) | ||
| INFO "Check config" | ||
| [ ! -f $CONF ] && ERRO "Missing config: /etc/systemd/swap.conf - try reinstall package" | ||
| check_root_rights | ||
| mkdir -p $WORK_DIR | ||
| [ -f $B_CONF ] && ERRO "systemd-swap already started!" | ||
| INFO "Backup config" | ||
| cp $CONF $B_CONF | ||
| INFO "Load config" | ||
| . $B_CONF | ||
|
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||
| if YN $zswap_enabled; then | ||
| [ ! -d /sys/module/zswap ] && ERRO "Zswap - not supported on current kernel" | ||
| ZSWAP_P=/sys/module/zswap/parameters/ | ||
| INFO "Zswap: backup current configuration: start" | ||
| mkdir -p $WORK_DIR/zswap/ | ||
| for file in $ZSWAP_P/*; do | ||
| cp $file $WORK_DIR/zswap/$(basename $file) | ||
| done | ||
| INFO "Zswap: backup current configuration: complete" | ||
| INFO "Zswap: set new parameters: start" | ||
| write $zswap_enabled $ZSWAP_P/enabled | ||
| write $zswap_compressor $ZSWAP_P/compressor | ||
| write $zswap_max_pool_percent $ZSWAP_P/max_pool_percent | ||
| write $zswap_zpool $ZSWAP_P/zpool | ||
| INFO "Zswap: set new parameters: complete" | ||
| fi | ||
|
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||
| if YN $zram_enabled; then | ||
| [ -z "$zram_size" ] && zram_size=$((ram_size/4))K | ||
| zram_streams=${zram_streams:-$cpu_count} | ||
| zram_alg=${zram_alg:-"lz4"} | ||
| zram_prio=${zram_prio:-"32767"} | ||
| zram_dev="" | ||
| INFO "Zram: check availability" | ||
| if [ ! -d /sys/module/zram ]; then | ||
| INFO "Zram: not part of kernel, so try find zram module" | ||
| modprobe -n zram || ERRO "Zram: can't find zram module!" | ||
| # Wrapper, for handling zram initialization problems | ||
| for (( i = 0; i < 10; i++ )); do | ||
| if [ ! -d /sys/module/zram ]; then | ||
| modprobe zram | ||
| sleep 1 | ||
| fi | ||
| done | ||
| INFO "Zram: module a successful loaded" | ||
| fi | ||
| INFO "Zram: module already loaded" | ||
| for (( i = 0; i < 10; i++ )); do | ||
| INFO "Zram: try initialize free device" | ||
| # zramctl is a external program -> return name of first free device | ||
| TMP=$(mktemp) | ||
| zramctl -f -a $zram_alg -t $zram_streams -s $zram_size &> $TMP | ||
| read -r OUTPUT < $TMP | ||
| rm $TMP | ||
| case "$OUTPUT" in | ||
| *"failed to reset: Device or resource busy"*) sleep 1 ;; | ||
| *"zramctl: no free zram device found"*) | ||
| WARN "Zram: zramctl can't find free device" | ||
| INFO "Zram: use workaround hook for hot add" | ||
| [ ! -f /sys/class/zram-control/hot_add ] && \ | ||
| ERRO "Zram: this kernel not support hot add zram device, please use 4.2+ kernels or see modinfo zram and make modprobe rule" | ||
| NEW_ZRAM=$(cat /sys/class/zram-control/hot_add) | ||
| INFO "Zram: success: new device /dev/zram$NEW_ZRAM" | ||
| ;; | ||
| /dev/zram*) | ||
| [ -b "$OUTPUT" ] || continue | ||
| zram_dev="$OUTPUT" | ||
| break | ||
| ;; | ||
| esac | ||
| done | ||
| INFO "Zram: initialized: $zram_dev" | ||
| mkdir -p $WORK_DIR/zram/ | ||
| mkswap "$zram_dev" &> /dev/null && \ | ||
| swapon -d -p $zram_prio "$zram_dev" && \ | ||
| ln -s $zram_dev $WORK_DIR/zram/ | ||
| fi | ||
|
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||
| if YN $swapf_enabled; then | ||
| swapf_size=${swapf_size:-"${ram_size}K"} | ||
| swapf_path=${swapf_path:-"/var/swap"} | ||
| swapf_prio=${swapf_prio:-"-1024"} | ||
| truncate -s $swapf_size $swapf_path | ||
| INFO "swapF: search free loop" | ||
| swapf_loop=$(losetup -f --show $swapf_path) | ||
| INFO "swapF: use $swapf_loop" | ||
| # loop use file descriptor, file still exist, but no have path | ||
| # When loop deatach file, file will be deleted. | ||
| rm $swapf_path | ||
| mkswap $swapf_loop &> /dev/null | ||
| swapon -p $swapf_prio -d $swapf_loop | ||
| # set autoclear flag | ||
| losetup -d $swapf_loop | ||
| mkdir -p $WORK_DIR/swapf | ||
| ln -s $swapf_loop $WORK_DIR/swapf/ | ||
| fi | ||
|
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||
| if YN $swapd_auto_swapon; then | ||
| INFO "swapD: search swap devices" | ||
| mkdir -p $WORK_DIR/swapd/ | ||
| for device in $(blkid -t TYPE=swap -o device | grep -vE '(zram|loop)'); do | ||
| for used_device in $(swapon --show=NAME --noheadings); do | ||
| [ "$device" == "$used_device" ] && unset device | ||
| done | ||
| [ ! -b "$device" ] && continue | ||
| swapon -d $device &> /dev/null && \ | ||
| ln -s $device $WORK_DIR/swapd/ && \ | ||
| INFO "swapD: enable device: $device" | ||
| done | ||
| fi | ||
| ;; | ||
| stop) | ||
| check_root_rights | ||
| [ ! -f $B_CONF ] && ERRO "systemd-swap not started!" | ||
| INFO "Load config" | ||
| . $B_CONF | ||
| if YN $zswap_enabled; then | ||
| [ ! -d /sys/module/zswap ] && ERRO "Zswap - not supported on current kernel" | ||
| ZSWAP_P=/sys/module/zswap/parameters/ | ||
| INFO "Zswap: restore configuration: start" | ||
| mkdir -p $WORK_DIR/zswap/ | ||
| for file in $WORK_DIR/zswap/*; do | ||
| cp $file $ZSWAP_P/$(basename $file) | ||
| done | ||
| INFO "Zswap: restore configuration: complete" | ||
| fi | ||
|
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||
| if YN $zram_enabled; then | ||
| for zram in $WORK_DIR/zram/*; do | ||
| [ ! -b $zram ] && continue | ||
| INFO "Zram: remove: /dev/$(basename $zram)" | ||
| swapoff $zram && \ | ||
| zramctl -r $(basename $zram) && \ | ||
| rm $zram && \ | ||
| INFO "Zram: removed: /dev/$(basename $zram)" | ||
| done | ||
| fi | ||
|
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||
| if YN $swapf_enabled; then | ||
| for device in $WORK_DIR/swapf/*; do | ||
| [ ! -b "$device" ] && continue | ||
| swapoff $device && \ | ||
| rm $device && \ | ||
| INFO "swapF: stopped /dev/$(basename $device)" | ||
| done | ||
| fi | ||
|
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||
| if YN $swapd_auto_swapon; then | ||
| for device in $WORK_DIR/swapd/*; do | ||
| [ ! -b "$device" ] && continue | ||
| swapoff $device && \ | ||
| rm $device && \ | ||
| INFO "swapD: disable device: $device" | ||
| done | ||
| fi | ||
| [ -d $WORK_DIR ] && rm -rf $WORK_DIR | ||
| ;; | ||
|
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||
| *) help ;; | ||
| esac |
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