博客介绍了在Ubuntu上默认启用透明大页面的相关操作。通过命令查看系统信息，进入指定目录，查看‘enabled’文件内容，尝试使用‘echo’命令修改为‘always’但遇到权限问题，未能成功修改。
如何在ubuntu上默认启用透明的大页面？
$uname -a
Linux yoda 3.5.0-23-generic #35~precise1-Ubuntu SMP Fri Jan 25 17:13:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
~$cd /sys/kernel/mm/transparent_hugepage/
/sys/kernel/mm/transparent_hugepage$ls
defrag enabled khugepaged
/sys/kernel/mm/transparent_hugepage$cat enabled
always [madvise] never
/sys/kernel/mm/transparent_hugepage$sudo echo always > enabled
-bash: enabled: Permission denied
/sys/kernel/mm/transparent_hugepage$sudo ls
[sudo] password for <...>:
defrag enabled khugepaged
/sys/kernel/mm/transparent_hugepage$sudo ls
defrag enabled khugepaged
/sys/kernel/mm/transparent_hugepage$sudo echo always > enabled
-bash: enabled: Permission denied
/sys/kernel/mm/transparent_hugepage$cat enabled
always [madvise] never
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