如何使用内核命令行参数设置 sysctl？

Question

是否可以使用内核命令行（在 中可见的那些）设置 Linux 内核sysctl设置（那些通常在 中设置）？/etc/sysctl.d/proc/cmdline

（使用grub配置文件/etc/default/grub变量GRUB_CMDLINE_LINUX="..."。）

Answer 1

从内核版本5.8开始，可以通过内核命令行设置 Sysctl 参数，这要归功于SUSE 的Vlastimil Babka。

sysctl.*=       [KNL]
                Set a sysctl parameter, right before loading the init
                process, as if the value was written to the respective
                /proc/sys/... file. Both '.' and '/' are recognized as
                separators. Unrecognized parameters and invalid values
                are reported in the kernel log. Sysctls registered
                later by a loaded module cannot be set this way.
                Example: sysctl.vm.swappiness=40