Re: [PATCH] printk: allow direct console printing to be enabled always

Randy Dunlap
2022-06-19T00:31:02Z

On 6/17/22 06:38, Jason A. Donenfeld wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 8090130b544b..a960c47a2002 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4389,6 +4389,14 @@
> printk.time= Show timing data prefixed to each printk message line
> Format: <bool> (1/Y/y=enable, 0/N/n=disable)
>
> + printk.always_direct=
> + Rather than using kthreads for printk output, always
> + write to the console immediately. This has performance
> + implications, but will result in a more faithful
> + ordering and interleaving with other processes writing
> + to the console.
> + Format: <bool> (1/Y/y=enable, 0/N/n=disable)

or:

+ Format: <bool> (1/Y/y/T/t/on=enable, 0/N/n/F/f/off=disable)

--
~Randy