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Talk:Swap on microSD

Revision as of 19:14, 19 July 2012

SDCard Partition Methods Thread

Talk on Dual SD Swap Method

See from post 67 - sixwheeledbeast

Swap Switching Scripts

Latest Version - sixwheeledbeast

swapswitch.sh

#!/bin/sh

# Made by sixwheeledbeast, Malkavian, Estel and vi_

# Setup swap names for script

## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3
echo $swap0

## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2
echo $swap1

## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3
echo $swap2

# Get Current Swap
swap=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swap 

# Go root
s=sudo
echo $sudo

# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

#Print Current Swap Pre
banner "$swap"

sleep 5

#Logic
if [ "$swap" = "$swap1" ] ;
then
   nice -20 $s swapon $swap2
   nice -20 $s swapoff $swap1
elif [ "$swap" = "$swap2" ] ;
then
   nice -20 $s swapon $swap1
   nice -20 $s swapoff $swap2
elif [ "$swap" = "$swap0" ] ;
then
   nice -20 $s swapon $swap1
   nice -20 $s swapoff $swap0
else
   banner "Swap Switch Failed"
fi

sleep 5

# Get Current Swap
swappost=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swappost 

#Print Current Swap Post
banner "$swappost"

swapswitchejectsd.sh

#!/bin/sh

# Made by sixwheeledbeast, Malkavian, Estel and vi_

# Setup swap names for script

## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3

## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2

## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3

# Get Current Swap
swap=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swap 

# Go root
s=sudo
echo $sudo

# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

#Print Current Swap Pre
banner "$swap"

sleep 5

#Logic
if [ "$swap" = "$swap0" ]
then
   banner "Swap on Internal already!"
elif [ "$swap" = "$swap1" ]
then
   nice -20 $s swapon $swap0
   nice -20 $s swapoff $swap1
elif [ "$swap" = "$swap2" ]
then
   nice -20 $s swapon $swap0
   nice -20 $s swapoff $swap2
else
   banner "Swap Switch Failed"
fi

sleep 5

# Get Current Swap
swappost=`cat /proc/swaps | awk '/dev/ {print $1}'`
echo $swappost 

if [ "$swappost" = "$swap0" ]
then
      banner "Safe to remove back cover"
else
sleep 2
      banner "ERROR! DO NOT REMOVE BACK COVER"
sleep 3
#Print Current Swap Post
       banner "$swappost"
fi

Version 1 - Malkavian

swapswitch.sh

#!/bin/sh

# Made by Sixwheeledbeast and Malkavian

# Setup swap names for script
## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3
## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2
## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3


# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

# Get Current Swap
old=`cat /proc/swaps | awk '/dev/ {print $1}'`

#Logic
if [ "$old" = "$swap0" ]
  then if [ $RANDOM -lt 16384 ] # RANDOM gives a value from 0 to 32787. We try 50% of probabilities
    then new="$swap1"
    else new="$swap2"
  fi
elif [ "$old" = "$swap1" ]
  then new="$swap2"
elif [ "$old" = "$swap2" ]
  then new="$swap1"
else banner "None of the configured swaps found active, revise the configuration. Current active swap (if any): $old"
     exit 1
fi

swapon $new || \
  ( banner "Ops, something failed, cannot swapon $new (so swapoff of $old neither done)" && exit 1 )
nice -20 swapoff $old || \
  ( banner "Ops, something failed, swapon of $new done but cannot swapoff $old" && exit 1 )
banner "OK: Swap switched from $old to $new"

swapscriptejectsd.sh

#!/bin/sh

# Made by Sixwheeledbeast and Malkavian

# Setup swap names for script
## Swap 0 - Backup internal swap location
swap0=/dev/mmcblk0p3
## Swap 1 - First Main Swap Location
swap1=/dev/mmcblk1p2
## Swap 2 - Second Main Swap Location
swap2=/dev/mmcblk1p3


# Setup notification banner
banner(){
o=org
f=freedesktop
n=Notifications
run-standalone.sh dbus-send --type=method_call \
--dest=$o.$f.$n /$o/$f/$n $o.$f.$n.SystemNoteInfoprint string:"$1"
}

# Get Current Swap
old=`cat /proc/swaps | awk '/dev/ {print $1}'`

#Logic
if [ "$old" = "$swap0" ]
  then banner "Swap on Internal already!" 
       exit 0
  else swapon $swap0 || \
         ( banner "Ops, something failed, cannot swapon $swap0 (so swapoff of $old neither done)" && exit 1 )
       nice -20 swapoff $old || \
         ( banner "Ops, something failed, swapon of $swap0 done but cannot swapoff $old" && exit 1 )
fi

Information on Starting Swap on SD at bootup

Upstart format - new file in event.d

etc/event.d/relocateswap

description "Micro SD Swap Location on Startup"
author "sixwheeledbeast"

console output

start on started rcS-late

script
        swapon /dev/mmcblk1p2        
        sleep 10
        swapoff /dev/mmcblk0p3
end script

Original script from main page

This script can be run via Terminal or using an application like Queen BeeCon Widget.

It is for refreshing swap if main swap space is on Micro SD Partition 2.

run-standalone.sh dbus-send --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteDialog string:"Start Swap Refresh" uint32:0 string:"OK"; sudo swapon /dev/mmcblk0p3 ; sudo swapoff /dev/mmcblk1p2 ; run-standalone.sh dbus-send --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteInfoprint string:"Swapping Back to Main Swap on SD..." ; sudo swapon /dev/mmcblk1p2 ; sudo swapoff /dev/mmcblk0p3 ; run-standalone.sh dbus-send --type=method_call --dest=org.freedesktop.Notifications /org/freedesktop/Notifications org.freedesktop.Notifications.SystemNoteDialog string:"Swap Refresh Complete" uint32:0 string:"OK"

This script can be modified to suit different swap locations as required.