From 5ff4ea6bc4d2bff3407e5ec509ff779ccf66782c Mon Sep 17 00:00:00 2001 From: Emil Muratov <gpm@hotplug.ru> Date: Thu, 2 Aug 2018 00:15:44 +0300 Subject: [PATCH] zram-swap: compression algorithm configuration option Compression algorithms for zram are provided by kernel crypto API, could be any of [lzo|zl4|deflate|<some_more>] depending on kernel modules. Compress algo for zram-swap could be defined via 'zram_comp_algo' option in 'system' section of '/etc/config/system' file, or via cli (for e.x. with 'uci set system.@System[0].zram_comp_algo=lz4 && uci commit system'). check available algo's via 'cat /sys/block/zram0 /comp_algorithm' Signed-off-by: Emil Muratov <gpm@hotplug.ru> (backported from b9e89adfb7881806d01e3bd259852e352f3b3ce8) --- package/system/zram-swap/files/zram.init | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init index 63a20479d1..419221b1a3 100644 --- a/package/system/zram-swap/files/zram.init +++ b/package/system/zram-swap/files/zram.init @@ -69,6 +69,23 @@ zram_reset() echo "1" >"$proc_entry" } +zram_comp_algo() +{ + local dev="$1" + local zram_comp_algo="$( uci -q get system.@system[0].zram_comp_algo )" + + if [ -z "$zram_comp_algo" ] || [ ! -e /sys/block/$( basename $dev )/comp_algorithm ]; then + return 0 + fi + + if [ `grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm` -ne 0 ]; then + logger -s -t zram_comp_algo -p daemon.debug "Set compression algorithm '$zram_comp_algo' for zram '$dev'" + echo $zram_comp_algo > "/sys/block/$( basename $dev )/comp_algorithm" + else + logger -s -t zram_comp_algo -p daemon.debug "Compression algorithm '$zram_comp_algo' is not supported for '$dev'" + fi +} + list_cpu_idx() { # Offset by 1 if /dev/zram0 is in use by /tmp @@ -108,6 +125,7 @@ start() zram_reset "$zram_dev" "enforcing defaults" echo $(( zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize" + zram_comp_algo "$zram_dev" mkswap "$zram_dev" swapon "$zram_dev" } done -- 2.30.2