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authorEmil Muratov <gpm@hotplug.ru>2018-08-02 00:15:44 +0300
committerHauke Mehrtens <hauke@hauke-m.de>2018-09-29 17:23:11 +0200
commitb9e89adfb7881806d01e3bd259852e352f3b3ce8 (patch)
treed538dd83ba59601a00e183e29a1fe59415dbdae1
parent33f47c28c6e881936f1b8dbd200b4b5724738bd0 (diff)
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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>
-rw-r--r--package/system/zram-swap/files/zram.init18
1 files changed, 18 insertions, 0 deletions
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