Oracle Linux will disable Transparent Huge Pages
in the Unbreakable Enterprise Kernel, beginning with Quarterly Update 5 for the
Unbreakable Enterprise Kernel, Release 2 (version 2.6.39-400.209.1).
è Oracle Linux 6.4 以後UEK kernel 就自己disable Transparent Huge Pages
查看是否啟用Transparent
Huge Pages
1：命令cat
/sys/kernel/mm/redhat_transparent_hugepage/enabled 該命令適用於Red Hat Enterprise Linux系統
[root@getlnx06 ~]#
more /etc/issue
Red Hat Enterprise
Linux Server release 6.6 (Santiago)
Kernel \r on an \m
[root@getlnx06 ~]#
cat /sys/kernel/mm/redhat_transparent_hugepage/enabled
[always] madvise
never
2：命令cat
/sys/kernel/mm/transparent_hugepage/enabled 該命令適用於其它Linux系統
但在Oracle Linux 會查不到此資訊
[root@getlnx06 ~]#
cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise
[never]
[root@getlnx06 ~]#
使用命令查看時，如果輸出結果為[always]表示Transparent
Huge Pages啟用了。[never]表示Transparent
Huge Pages、[madvise]表示
3：如何HugePages_Total返回0，也意味著Transparent
Huge Pages禁用了
[root@rac1 ~]# grep
-i HugePages_Total /proc/meminfo
HugePages_Total:
0
4：cat /proc/sys/vm/nr_hugepages返回0也意味著Transparent
Huge Pages禁用了。
[root@rac1 ~]# cat
/proc/sys/vm/nr_hugepages
0
禁用、啟用Transparent Huge Pages功能
方法1：設置/etc/grub.conf檔，在系統啟動是禁用。
[root@getlnx06 ~]# vi
/etc/grub.conf
# grub.conf generated
by anaconda
#
# Note that you do
not have to rerun grub after making changes to this file
# NOTICE: You
have a /boot partition. This means that
#
all kernel and initrd paths are relative to /boot/, eg.
#
root (hd0,0)
#
kernel /vmlinuz-version ro root=/dev/mapper/VolGroup--LogVol0-LogVol01
#
initrd /initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Red Hat
Enterprise Linux 6 (2.6.32-504.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-504.el6.x86_64 ro
root=/dev/mapper/VolGroup--LogVol0-LogVol01 rd_NO_LUKS LANG=en_US.UTF-8
rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto
rd_LVM_LV=VolGroup-LogVol0/LogVol01 rd_LVM_LV=VolGroup-LogVol0/LogVol00
KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /initramfs-2.6.32-504.el6.x86_64.img
transparent_hugepage=never
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