Is the Transparent Huge Pages (THP) feature enabled on RHEL 6 (x86) 32-bit architecture ?

本文详细解析了透明大页(THP)特性在Red Hat Enterprise Linux 6和5版本中32位与64位架构下的支持情况。在RHEL 6的32位版本中，THP特性缺失，而64位版本则支持该特性。对于RHEL 5，无论32位还是64位，均不支持THP。文章还深入探讨了内核配置项CONFIG_TRANSPARENT_HUGEPAGE的作用。

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Is the Transparent Huge Pages (THP) feature enabled on RHEL 6 (x86) 32-bit architecture, also enabled on RHEL 5?

SOLUTION 已验证 - 已更新 2019年四月5日08:49 -

English

环境

Red Hat Enterprise Linux 6 (x86) 32-bit
Red Hat Enterprise Linux 5 (x86/x86_64) 32/64-bit
Transparent Huge Pages (THP)
redhat_transparent_hugepage

问题

Is Transparent Huge Pages (THP) feature enabled on Red Hat Enterprise Linux 6 (x86) 32-bit architecture ?
Why Red Hat Enterprise Linux 6 (x86) 32-bit server does not have "redhat_transparent_hugepage" directory inside /sys/kernel/mm/?
Eg:

Raw

# cat /sys/kernel/mm/redhat_transparent_hugepage/{defrag,enabled}
cat: /sys/kernel/mm/redhat_transparent_hugepage/defrag: No such file or directory
cat: /sys/kernel/mm/redhat_transparent_hugepage/enabled: No such file or directory

Is Transparent Huge Pages (THP) feature enabled on Red Hat Enterprise Linux 5 (x86/x86_64) 32/64-bit architecture ?

决议

The Transparent Huge Pages (THP) feature is not present on the 32-bit (x86) version of Red Hat Enterprise Linux 6. Install the 64-bit (x86_64) version to enable this feature.
The Transparent Huge Pages (THP) feature is not present on the 32/64-bit (x86/x86_64) version of Red Hat Enterprise Linux 5.

根源

The kernel configuration item "CONFIG_TRANSPARENT_HUGEPAGE" is not present in Red Hat Enterprise Linux 6 (x86).

Raw
```
# grep -i huge /boot/config-2.6.32-358.el6.i686 
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y
```

The kernel configuration item "CONFIG_TRANSPARENT_HUGEPAGE" is enabled on Red Hat Enterprise Linux 6 (x86_64).

Raw

# grep -i huge /boot/config-2.6.32-279.9.1.el6.x86_64 
CONFIG_TRANSPARENT_HUGEPAGE=y
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y

# grep -i huge /boot/config-2.6.18-194.el5
CONFIG_HUGETLBFS=y
CONFIG_HUGETLB_PAGE=y

# uname -a
Linux localhost 2.6.18-194.el5 #1 SMP Tue Mar 16 21:52:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux