openEuler环境下关闭透明大页

打算在openEuler上安装openGauss，在环境准备阶段遇到了关闭透明大页的需求，特此记录。

关闭透明大页

Linux大页与透明大页 - 墨天轮 (modb.pro)

查看透明大页开启情况

[root@localhost ~]# cat /sys/kernel/mm/transparent_hugepage/enabled

[always] madvise never

[root@localhost ~]# cat /sys/kernel/mm/transparent_hugepage/defrag

always defer defer+madvise [madvise] never

[root@localhost ~]#

以上结果表明透明大页处于启动状态，需要关闭

[root@localhost ~]# grep HugePage /proc/meminfo

AnonHugePages: 4096 kB

ShmemHugePages: 0 kB

FileHugePages: 0 kB

HugePages_Total: 0

HugePages_Free: 0

HugePages_Rsvd: 0

HugePages_Surp: 0

[root@localhost ~]#

AnonHugePages > 0, 说明启用了透明大页。

临时关闭透明大页

[root@localhost ~]# echo never > /sys/kernel/mm/transparent_hugepage/enabled

[root@localhost ~]#

[root@localhost ~]# cat /sys/kernel/mm/transparent_hugepage/enabled

always madvise [never]

[root@localhost ~]#

[root@localhost ~]# echo never > /sys/kernel/mm/transparent_hugepage/defrag

[root@localhost ~]#

[root@localhost ~]# cat /sys/kernel/mm/transparent_hugepage/defrag

always defer defer+madvise madvise [never]

[root@localhost ~]#

永久关闭透明大页

修改/etc/rc.d/rc.local

[root@localhost ~]# vi /etc/rc.d/rc.local

[root@localhost ~]#

[root@localhost ~]# cat /etc/rc.d/rc.local

#!/bin/bash

# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES

#

# It is highly advisable to create own systemd services or udev rules

# to run scripts during boot instead of using this file.

#

# In contrast to previous versions due to parallel execution during boot

# this script will NOT be run after all other services.

#

# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure

# that this script will be executed during boot.

touch /var/lock/subsys/local

if test -f /sys/kernel/mm/transparent_hugepage/enabled; then

echo never > /sys/kernel/mm/transparent_hugepage/enabled

fi

if test -f /sys/kernel/mm/transparent_hugepage/defrag; then

echo never > /sys/kernel/mm/transparent_hugepage/defrag

fi

[root@localhost ~]#