kswapd0 is taking a lot of cpu

kswapd0 is taking 99.9% of my CPU as top shows me, no any other process consume more CPU then this process.

1. Tell kswapd0 to only move stuff to SWAP when you are completely OUT of RAM. Run below command to avoid this SWAP issue.

echo vm.swappiness=0 | sudo tee -a /etc/sysctl.conf

Meaning of this command is if your RAM is fully consume then after it will used the SWAP partition which is created on your HDD.

2. A reboot can resolved the problem temporarily.

3. Check output of below command

# cat /proc/sys/vm/vfs_cache_pressure
100

The solution for dropping cache is 

the solution was actually # echo 1 > /proc/sys/vm/drop_caches:

 4. For permanent solution you can create shell script and set it in cron.

#!/bin/bash## run as cron, thus no $PATH, thus need to define all absolute pathstop=/usr/bin/topgrep=/bin/greptop=$($top -bn1 -o %CPU -u0 | $grep -m2 -E "%CPU|kswapd0")IFS=''set -fi=0for line in $topdo        #echo $i $line        if ! (( i++ ))        then                pos=${line%%%CPU*}                pos=${#pos}                #echo $pos        else                cpu=${line:(($pos-1)):3}                cpu=${cpu// /}                #echo $cpu        fidone[[ -n $cpu ]] && (( $cpu >= 90 )) && echo 1 > /proc/sys/vm/drop_caches && echo "$$ $0: cache dropped (kswapd0 %CPU=$cpu)" >&2 && exit 1exit 0

Invoked with

# m h  dom mon dow   command  * 4  *   *   *     /bin/bash /path/to/batch/drop_caches.sh >> /var/log/syslog 2>&1

 This command will run at every 4 hours so set timings as per your need.