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zram-swap: Add extra commands for status/compaction

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This patch adds two new commands:
  zram status - shows memory stats for all zram swaps
  zram compaction - trigger compaction for all zram swaps

Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Emil Muratov 2019-02-24 10:00:03 +03:00 committed by Christian Lamparter
parent afa5ce2493
commit a9deed62af
1 changed files with 34 additions and 21 deletions
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55
package/system/zram-swap/files/zram.init
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@ -2,17 +2,21 @@
START=15
ram_size()
EXTRA_COMMANDS="compact status"
EXTRA_HELP=" compact trigger compaction for all Z-RAM swap dev's
status print out status information & statistics about Z-RAM swap devices"
ram_getsize()
{
local line
while read line; do case "$line" in MemTotal:*) set $line; echo "$2"; break ;; esac; done </proc/meminfo
}
zram_size() # in megabytes
zram_getsize() # in megabytes
{
local zram_size="$( uci -q get system.@system[0].zram_size_mb )"
local ram_size="$( ram_size )"
local ram_size="$( ram_getsize )"
if [ -z "$zram_size" ]; then
# e.g. 6mb for 16mb-routers or 61mb for 128mb-routers
@ -106,9 +110,9 @@ zram_comp_streams()
fi
}
#print various stats info about zram swap device
zram_stats()
{
#print various stats info about zram swap device
local zdev="/sys/block/$( basename "$1" )"
printf "\nGathering stats info for zram device \"$( basename "$1" )\"\n\n"
@ -143,12 +147,16 @@ zram_compact()
# compact zram device (reduce memory allocation overhead)
local zdev="/sys/block/$( basename "$1" )"
old_mem_used=`awk '{print $3}' <$zdev/mm_stat`
old_overhead=`awk '{print $3-$2}' <$zdev/mm_stat`
local old_mem_used=`awk '{print $3}' <$zdev/mm_stat`
local old_overhead=`awk '{print $3-$2}' <$zdev/mm_stat`
echo 1 > $zdev/compact
# If not running interactively, than just return
[ -z "$PS1" ] && return 0
echo ""
echo "Compacting zram device..."
echo 1 > $zdev/compact
echo "Compacting zram device $zdev"
awk -v old_mem="$old_mem_used" -v ovr="$old_overhead" 'BEGIN { fmt = "%-25s - %.1f %s\n" }
{ printf fmt, "Memory usage reduced by ", (old_mem-$3)/1024/1024, "MiB"
printf fmt, "Overhead reduced by", (ovr-($3-$2))/ovr*100, "%" }' <$zdev/mm_stat
@ -156,23 +164,13 @@ zram_compact()
start()
{
local zram_size="$( zram_size )"
local zram_dev
if [ $( grep -cs zram /proc/swaps ) -ne 0 ]; then
logger -s -t zram_start -p daemon.notice "[OK] zram swap is already mounted"
# If not running interactively, than just quit
[ -z "$PS1" ] && return 1
# show memory stats and compact all zram swaps
for zram_dev in $( grep zram /proc/swaps |awk '{print $1}' ); do {
zram_compact "$zram_dev"
zram_stats "$zram_dev"
} done
return
return 1
fi
zram_dev="$( zram_getdev )"
local zram_size="$( zram_getsize )"
local zram_dev="$( zram_getdev )"
zram_applicable "$zram_dev" || return 1
logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
@ -200,3 +198,18 @@ stop()
} done
}
# show memory stats for all zram swaps
status()
{
for zram_dev in $( grep zram /proc/swaps |awk '{print $1}' ); do {
zram_stats "$zram_dev"
} done
}
# trigger compaction for all zram swaps
compact()
{
for zram_dev in $( grep zram /proc/swaps |awk '{print $1}' ); do {
zram_compact "$zram_dev"
} done
}