怎么在RHEL7上禁用transparent hugepages (THP)

原文标题：

How to disable transparent hugepages (THP) on Red Hat Enterprise Linux 7

原文网址：

https://access.redhat.com/solutions/1320153

环境

Red Hat Enterprise Linux 7
transparent hugepages (THP)
tuned

问题

How to disable transparent hugepages (THP) on Red Hat Enterprise Linux 7
Disabling transparent hugepages (THP) on Red Hat Enterprise Linux 7 is not taking effect.

决议

Follow the steps below

Add the "transparent_hugepage=never" kernel parameter option to the grub2 configuration file.
- Append or change the "transparent_hugepage=never" kernel parameter on the GRUB_CMDLINE_LINUX option in /etc/default/grub file. Only include the parameter once.
  Raw
```
GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap ... transparent_hugepage=never"
```
Rebuild the /boot/grub2/grub.cfg file by running the grub2-mkconfig -o command as follows:
- Please ensure to take a backup of the existing /boot/grub2/grub.cfg before rebuilding.
  - On BIOS-based machines: ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
  - On UEFI-based machines: ~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
Reboot the system and verify option has been added
- Reboot the system
  Raw
```
# shutdown -r now
```
- Verify the parameter is set correctly
  Raw
```
# cat /proc/cmdline
```

If Transparent Huge Pages (THP) is still not disabled, continue and use one of the options below.

Option 1: (Recommended) create a customized tuned profile with disabled THP
- With this resolution we will create a customized version of the currently running profile. The customized version will disable THP.
- Find out which profile is active, create a copy. In the following example we currently use the throughput-performance profile:
  Raw
```
# tuned-adm active
Current active profile: throughput-performance
```
- To create customized profile, create a new directory in /etc/tuned directory with desired profile name.
  Raw
```
# mkdir /etc/tuned/myprofile-nothp
```
- Then create a new tuned.conf file for myprofile-nothp, and insert the new tuning info:
  Raw
```
# cat /etc/tuned/myprofile-nothp/tuned.conf
[main]
include= throughput-performance[vm]
transparent_hugepages=never
```
- Make the script executable:
  Raw
```
# chmod +x /etc/tuned/myprofile-nothp/tuned.conf
```
- Enable myprofile like so:
  Raw
```
# tuned-adm profile myprofile-nothp
```
- This change will immediately take effect and persist reboots.
- To verify if THP are disabled or not, run below command:
  Raw
```
# cat /sys/kernel/mm/transparent_hugepage/enabled
```
Option 2: (Alternative) Disable tuned services
- This resolution will disable the tuned services.
  Raw
```
# systemctl stop tuned
# systemctl disable tuned
```
- OR
  Raw
```
# tuned-adm off
```
- Now add "transparent_hugepage=never" kernel parameter in grub2 configuration file as explained in steps 1-3 above.
- Reboot the server for changes to take effect.

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怎么在RHEL7上禁用transparent hugepages (THP)

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