背景：
有MongoBD数据库和tokuBD对THP 的设置有特殊的设置要求。需要关闭THP功能。


设置：
#touch  /etc/init.d/disable-transparent-hugepages
#vim /etc/init.d/disable-transparent-hugepages
#!/bin/bash
### BEGIN INIT INFO
# Provides:          disable-transparent-hugepages
# Required-Start:    $local_fs
# Required-Stop:
# X-Start-Before:    mongod mongodb-mms-automation-agent
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Disable Linux transparent huge pages
# Description:       Disable Linux transparent huge pages, to improve
#                    database performance.
### END INIT INFO

case $1 in
  start)
    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/transparent_hugepage
    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
    else
      return 0
    fi

    echo 'never' > ${thp_path}/enabled
    echo 'never' > ${thp_path}/defrag

    re='^[0-1]+$'
    if [[ $(cat ${thp_path}/khugepaged/defrag) =~ $re ]]
    then
      # RHEL 7
      echo 0  > ${thp_path}/khugepaged/defrag
    else
      # RHEL 6
      echo 'no' > ${thp_path}/khugepaged/defrag
    fi

    unset re
    unset thp_path
    ;;
esac

2.设置权限:
#sudo chmod 755 /etc/init.d/disable-transparent-hugepages
3.设置系统自动启动：
sudo chkconfig --add disable-transparent-hugepages

4.创建目录：
sudo mkdir /etc/tuned/no-thp
5.编写文件：
#vim  /etc/tuned/no-thp/tuned.conf
[main]
include=virtual-guest
[vm]
transparent_hugepages=never
#sudo tuned-adm profile no-thp
6.验证：
cat /sys/kernel/mm/transparent_hugepage/enabled
cat /sys/kernel/mm/transparent_hugepage/defrag