Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
### 禁用大内存页面 transparent_hugepage=never
* 编辑 /etc/default/grub，在GRUB_CMDLINE_LINUX加入选项 transparent_hugepage=never
```bash
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="rd.lvm.lv=fedora/swap rd.lvm.lv=fedora/root rhgb quiet transparent_hugepage=never"
GRUB_DISABLE_RECOVERY="true"
```
* 重新生成grub配置文件
```bash
sudo grub-mkconfig -o /boot/grub/grub.cfg
```
* 重启系统,查询hugepage状态
```bash
cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]
```