RedHat 7.4关闭透明大页

查看透明大页内存是否开启

cat /sys/kernel/mm/transparent_hugepage/enabled

返回

[always] madvise never  #如果输出结果为[always]表示透明大页启用了。[never]表示透明大页禁用

关闭透明大页内存操作步骤

第一步

在GRUB_CMDLINE_LINUX加入选项 transparent_hugepage=never

echo 'GRUB_CMDLINE_LINUX="transparent_hugepage=never"' >>  /etc/default/grub

第二步

重新生成grub配置文件
输入命令

grub2-mkconfig -o /boot/grub2/grub.cfg

返回

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-bdd94cf792bd4ac6a087ff2542ba6cd0
Found initrd image: /boot/initramfs-0-rescue-bdd94cf792bd4ac6a087ff2542ba6cd0.img
done

输入命令

grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

返回

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-693.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-693.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-bdd94cf792bd4ac6a087ff2542ba6cd0
Found initrd image: /boot/initramfs-0-rescue-bdd94cf792bd4ac6a087ff2542ba6cd0.img
done

第三步

重启操作系统

reboot

查看是否生效：

cat /proc/cmdline

返回

BOOT_IMAGE=/vmlinuz-3.10.0-693.el7.x86_64 root=/dev/mapper/rhel-root ro transparent_hugepage=never

或者

grep Huge /proc/meminfo 

返回

AnonHugePages:         0 kB  #与透明大页有关，透明大页关闭，则显示0
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB

或者

cat /sys/kernel/mm/transparent_hugepage/enabled

返回

always madvise [never]