Using Ozcan ROM 6.3 on my Samsung Galaxy S4, I'm observing kswapd0 process making CPU laggy. The same thing happened on another TW KK ROM - Omega. After researching on it for weeks, I realized that it's the process that does the SWAP job - transferring RAM contents to storage when memory is low.

Presently, I don't want to use SWAP, so the following are the workarounds that I tried to disable SWAP:

  • Tried Apps like Swapper2, Reset Swap to delete swapfile. The process vanishes for few seconds but it looks like the swapfile again gets created (checked by using command, free).
  • Used the command swapoff -a (to Stop swapping on all swap devices) but it gives me an error - swapoff: /etc/fstab: No such file or directory.

So, my Queries are as follows:

  • Why and how does SWAP gets enabled automatically? Is the kernel or ROM responsible for it?

  • When actually could the SWAP partition be created when I didn't do it manually? On flashing the ROM?

  • What I'm doing wrong in the swapoff comand? After reading about the same error, I think it's related to the location of the swapfile. So, how can I know the location of the swapfile? Any suggestions on disabling the SWAP permanently or making kswapd0 use less CPU if the lag is not directly related to SWAP?

(Originally posted on XDA)

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  • creieras.wordpress.com/2011/12/16/… says it's a problem with the way the kernel handles memory.
    – endolith
    Commented May 5, 2016 at 16:02

1 Answer 1


It might not be possible to disable kswapd0. Even if it's possible to disable it, you should not try. You see, kswapd0 does important work even if you don't have a swap file.

On the Ubuntu Stack Exchange website, psusi explains:

Swap space is only used for data that is not backed by any other file. Data that is mapped from other files on disk (such as executable programs) is still swapped to their respective files even if you don't have a swap device.

You should visit psusi's original answer and vote it up.

  • ok but why is it hogging the CPU?
    – endolith
    Commented Dec 11, 2015 at 3:31
  • @endolith: I presume it's swapping binaries into and out out of RAM. This takes CPU time. Don't worry about the CPU time that kswapd0 takes up. Commented Dec 14, 2015 at 8:02
  • But it's taking a LOT of CPU time, and the phone is hot for no reason
    – endolith
    Commented May 5, 2016 at 16:00
  • How much is a lot? Also, how hot is the phone? For what it's worth, certain apps can tell you the battery temperature (with help from the thermistor built into every Android phone battery). Also, other apps can tell you the CPU temperature. Also, you can use some external device to measure the phone's external temperature. Maybe a thermal imaging camera? Commented May 20, 2016 at 17:37

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