Swap usage increased when mysqldump

[burning kustom]

Hi, is mysqldump keep increasing swap usage ?

because my swap usage is increased 10% at the time mysqldump running

This is my mysqldump script, it working ! but swap usage is increasing too

mysql_db_bak-GR.sh

bak_dir=/blj/db_bak
d=$(date -d "today" '+%Y-%m-%d-%H%M')

mysql -uadmindb -pmypass -h127.0.0.1 --execute="show master status\G;" > ${bak_dir}/$1_$d_'masterpos'.dump

mysqldump -uadmindb -pmysql_db_bak-GR.sh -h127.0.0.1 --no-create-info --single-transaction --quick --master-data=2 $1 > ${bak_dir}/$1_$d.dump

mysqldump -uadmindb -pmysql_db_bak-GR.sh -h127.0.0.1 --no-data $1 > ${bak_dir}/$1_$d_'schema'.dump