On Sun, Dec 21, 2014 at 07:47:53PM +0100, Bruno Prémont wrote: > On Sat, 20 December 2014 [email protected] wrote: > > This adds to to the console= command line options allowing the > > addition of a per console log level setting. > > > > examples, > > > > console=ttyS0,ll4 > > console=tty0,ll6 > > > > This can be used on systems which have multiple serial consoles, but > > it's desired for logging to be light on one and heavy on another. > > Looks useful to me. > What would be the best way to make these per-console loglevels > configurable at runtime? `dmesg -n $LEVEL` only affects the global > limit. > > One drawback to letting global loglevel have precedence is that > all consoles that should not get detailed log messages need to have > their loglevel explicitly lowered and it's not possible to have > one console forced to show more than the global loglevel.
Right, reason for the patch. > > An approach I would prefer is to have all consoles follow global > loglevel except when something different had been explicitly requested > for them. This patch is mostly like this. It breaks down when you set the "llX" parameter to something above KERN_NOTICE, and the global one is also set above that. > This way a single console can be added later on (e.g. netconsole) > and set to pass through debug messages without affecting anyone else. Not following the "added later" part. Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
