How to disable Transparent HugePages

Disabling Transparent HugePages. 

1. check the status

In RHEL

cat /sys/kernel/mm/redhat_transparent_hugepage/enabled

in other OS

cat /sys/kernel/mm/transparent_hugepage/enabled

Output:

[always] madvise never

Its highlighted for always, so Transparent HugePages are enabled.

2. disable the transparent_hugepage.

To disable this modify/add line transparent_hugepage=never

as below:

#cat /etc/default/grub

GRUB_TIMEOUT=5

GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"

GRUB_DEFAULT=saved

GRUB_DISABLE_SUBMENU=true

GRUB_TERMINAL_OUTPUT="console"

GRUB_CMDLINE_LINUX="console=tty1 console=ttyS0 earlyprintk=ttyS0 rootdelay=300 transparent_hugepage=never"

GRUB_DISABLE_RECOVERY="true"

3. Run below command to make recreate file grub

 #grub2-mkconfig -o /boot/grub2/grub.cfg

4. Restart the server.

5. verification after restart the server.

After modification output will be as below, never  is highlighted, so its disabled.

#cat /sys/kernel/mm/transparent_hugepage/enabled

always madvise [never]