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zram-swap: Add "max compression streams" configuration option

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Config option to limit maximum compression streams per zram dev for
multicore CPU's. This could be defined via 'zram_comp_streams' option in
the 'system' section of '/etc/config/system' file or via cli (for e.x.
with 'uci set system.@System[0].zram_comp_streams=2 && uci commit
system'). Default is number of logical CPU cores.

Signed-off-by: Emil Muratov <gpm@hotplug.ru>
(backported from 70d3ffb47f)
This commit is contained in:
Emil Muratov 2018-08-02 01:05:14 +03:00 committed by Jo-Philipp Wich
parent 2d4b52707d
commit 2432658128
1 changed files with 14 additions and 0 deletions
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14
package/system/zram-swap/files/zram.init
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@ -93,6 +93,19 @@ zram_comp_algo()
fi
}
zram_comp_streams()
{
local dev="$1"
local logical_cpus=$( grep -ci "^processor" /proc/cpuinfo )
[ $logical_cpus -gt 1 ] || return 1
local zram_comp_streams="$( uci -q get system.@system[0].zram_comp_streams )"
[ -n "$zram_comp_streams" ] && [ "$zram_comp_streams" -le "$logical_cpus" ] || zram_comp_streams=$logical_cpus
if [ -e /sys/block/$( basename $dev )/max_comp_streams ]; then
logger -s -t zram_comp_streams -p daemon.debug "Set max compression streams to '$zram_comp_streams' for zram '$dev'"
echo $zram_comp_streams > /sys/block/$( basename $dev )/max_comp_streams
fi
}
start()
{
local zram_size="$( zram_size )"
@ -110,6 +123,7 @@ start()
zram_reset "$zram_dev" "enforcing defaults"
zram_comp_algo "$zram_dev"
zram_comp_streams "$zram_dev"
echo $(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
mkswap "$zram_dev"
swapon "$zram_dev"