Messages in this thread | | | From | John Ogness <> | Subject | Re: design: was: Re: [RFC PATCH v2] printk: console: Allow each console to have its own loglevel | Date | Fri, 08 Jul 2022 21:10:35 +0206 |
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On 2022-07-08, Petr Mladek <pmladek@suse.com> wrote: > The console-specific loglevel might be set by: > > + "console=device,options/loglevel" kernel parameter at boot time
I ask if we avoid the use of "/loglevel" and instead use a generic scheme of:
console=device,option,option,option
Of course, it would mean that the type of option would need to be specified. Something like:
console=ttyS0,115200n8,loglevel=3
The reason why I make such a request is because I would like to be able to support disabling threading for certain consoles. Something like:
console=ttyS0,115200n8,nothread
or when we have atomic consoles that we can specify that they are always used with a "sync" option:
console=ttyS0,115200n8,sync
This is not the time to discuss what those strings should be. The point is that we should use a syntax that allows adding more options for the future.
Linus already [0] showed some approval to this method of option extending as I suggested the "mute" option to have consoles keep quiet.
John Ogness
P.S. FWIW, I think this is a nice feature. I even mentioned it in my LPC2019 printk talk, as there were previous efforts [1] to get this feature implemented.
[0] https://lore.kernel.org/lkml/CAHk-=wif0QueN8ovkm_x7TsOgOHjRrOa4wU-zHgBP=FTAnzvNA@mail.gmail.com
[1] https://lore.kernel.org/lkml/bc1fe800930be76761b2bb4e6108fe5876a005c9.1491345440.git.calvinowens@fb.com
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