【转】怎么在RHEL8中禁用透明的大页？

最新推荐文章于 2025-09-28 16:42:46 发布

转载最新推荐文章于 2025-09-28 16:42:46 发布 · 1.2k 阅读

文章标签：

#rhel8 #rhel #8 #transparent #HugePage

RHEL8 专栏收录该内容

217 篇文章

订阅专栏

博客围绕在Red Hat Enterprise Linux 8上禁用透明大页（THP）展开。先介绍了环境为RHEL 8和THP，提出如何禁用THP的问题，接着给出决议，包括通过内核启动参数、命令行和配置文件等方式禁用，最后需重启系统使更改生效并检查文件确认。

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

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

SOLUTION 已验证 - 已更新 2019年二月25日17:28 -

English

环境

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.

Raw

# 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.

Raw

# 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.

Raw

# 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.

Raw

# reboot

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

Raw

# 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:

Raw

# 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.

Raw

# reboot

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

Raw

# 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