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authorEmil Muratov <gpm@hotplug.ru>2018-08-02 00:50:00 +0300
committerHauke Mehrtens <hauke@hauke-m.de>2018-09-29 17:23:11 +0200
commit814cae7362c3bd57e8fd9305d5d0b48ff219d4d0 (patch)
tree27381f24a28bd6e4cd3139ff8c6ef71ff007f59a /package/system
parent9edc1fe8abac6638cd05640279bc741a23b8d260 (diff)
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zram-swap: fix number of created zram devices for multicore CPU's
Use only one zram swap device of the specified $size instead of [N x $size] devices for multicore CPUs Now zram module uses multiple compression streams for each dev by default, so we do not need to create several zram devs to utilize multicore CPUs. Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Diffstat (limited to 'package/system')
-rwxr-xr-x[-rw-r--r--]package/system/zram-swap/files/zram.init74
1 files changed, 29 insertions, 45 deletions
diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init
index 1eba3f4d98..2db986f9a8 100644..100755
--- a/package/system/zram-swap/files/zram.init
+++ b/package/system/zram-swap/files/zram.init
@@ -26,11 +26,6 @@ zram_applicable()
{
local zram_dev="$1"
- grep -sq ^"$zram_dev " /proc/swaps && {
- logger -s -t zram_applicable -p daemon.notice "[OK] '$zram_dev' already active"
- return 1
- }
-
[ -e "$zram_dev" ] || {
logger -s -t zram_applicable -p daemon.crit "[ERROR] device '$zram_dev' not found"
return 1
@@ -54,9 +49,8 @@ zram_applicable()
zram_dev()
{
- local core="$1"
-
- echo "/dev/zram${core:-0}"
+ local idx="$1"
+ echo "/dev/zram${idx:-0}"
}
zram_reset()
@@ -69,6 +63,19 @@ zram_reset()
echo "1" >"$proc_entry"
}
+zram_getdev()
+{
+ #get unallocated zram dev
+ local zdev=$( zram_dev )
+
+ if [ "$(mount | grep $zdev)" ]; then
+ local idx=`cat /sys/class/zram-control/hot_add`
+ zdev="$( zram_dev $idx )"
+ fi
+
+ echo $zdev
+}
+
zram_comp_algo()
{
local dev="$1"
@@ -86,49 +93,26 @@ zram_comp_algo()
fi
}
-list_cpu_idx()
-{
- # Offset by 1 if /dev/zram0 is in use by /tmp
- if mount | grep -q /dev/zram0; then
- local line i=1
- # Hot-add new ZRAM device (if necessary)
- if [ ! -b /dev/zram1 ]; then
- cat /sys/class/zram-control/hot_add
- fi
- else
- local line i=0
- fi
-
- while read line; do {
- case "$line" in
- [Pp]rocessor*)
- echo $i
- i=$(( i + 1 ))
- ;;
- esac
- } done <"/proc/cpuinfo"
-}
-
start()
{
- # http://shmilyxbq-compcache.googlecode.com/hg/README
- # if >1 cpu_core, reinit kmodule with e.g. num_devices=4
-
local zram_size="$( zram_size )"
- local zram_dev core
+ local zram_dev
- for core in $( list_cpu_idx ); do {
- zram_dev="$( zram_dev "$core" )"
- zram_applicable "$zram_dev" || return 1
+ if [ $( grep -cs zram /proc/swaps ) -ne 0 ]; then
+ logger -s -t zram_start -p daemon.notice "[OK] zram swap is already mounted"
+ return 1
+ fi
- logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
+ zram_dev="$( zram_getdev )"
+ zram_applicable "$zram_dev" || return 1
- zram_reset "$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
+ logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
+
+ zram_reset "$zram_dev" "enforcing defaults"
+ zram_comp_algo "$zram_dev"
+ echo $(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
+ mkswap "$zram_dev"
+ swapon "$zram_dev"
}
stop()