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Red Hat Enterprise Linux 8
Transparent HugePage (THP)

问题

How to disable transparent Hugepage (THP) on Red Hat Enterprise Linux 8?

决议

The transparent hugepage (THP) can be disabled by booting the system with the kernel boot parameter transparent_hugepage=never.

Command Line: The grub2-editenv command can be used to set the kernel parameter transparent_hugepage=never at the end of kerneloptsin the file /boot/grub2/grubenv.

Get the current kernel command line parameters.

# grub2-editenv - list | grep kernelopts
kernelopts=root=/dev/mapper/rhel-root ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap

Set the kernel parameter transparent_hugepage=never by using the grub2-editenv command.

# grub2-editenv - set "kernelopts=root=/dev/mapper/rhel-root ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap transparent_hugepage=never"

Verify the changes.

# grub2-editenv - list | grep kernelopts
kernelopts=root=/dev/mapper/rhel-root ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap transparent_hugepage=never

Reboot the system for changes to take effect.

# reboot

Check the following files to confirm that the transparent hugepage (THP) is disabled.

# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
# grep AnonHugePages: /proc/meminfo 
AnonHugePages:         0 kB
# grep nr_anon_transparent_hugepages /proc/vmstat
nr_anon_transparent_hugepages 0

Configuration File: The kernel boot parameter transparent_hugepage=never can be directly set at the end of kernelopts in the file /boot/grub2/grubenv.

Edit file /boot/grub2/grubenv and set the kernel boot parameter transparent_hugepage=never at the end of kernelopts.

Eg:

# cat /boot/grub2/grubenv
# GRUB Environment Block
saved_entry=d956a05b4c9341b9a364b20b801afc12-4.18.0-64.el8.x86_64
boot_success=0
boot_indeterminate=0
kernelopts=root=/dev/mapper/rhel-root ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap transparent_hugepage=never

Reboot the system for changes to take effect.

# reboot

Check the following files to confirm that the transparent hugepage (THP) is disabled.

# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
# grep AnonHugePages: /proc/meminfo 
AnonHugePages:         0 kB
# grep nr_anon_transparent_hugepages /proc/vmstat
nr_anon_transparent_hugepages 0

ITPub博客

How to disable transparent Hugepage (THP) on Red Hat Enterprise Linux 8?

https://access.redhat.com/solutions/3799821

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