Re: scsi: Implement per-cpu logging buffer

From: Jiri Kosina
Date: Tue Feb 17 2015 - 08:01:28 EST

On Fri, 13 Feb 2015, Hannes Reinecke wrote:

> Thing is, if we were to use per-CPU buffers for printk() out of
> necessity we have to queue these buffers for writing out. So there is a
> time window during which the message already is in the per-CPU buffer
> but still not printed out as printk() is currently writing out one of
> the other per-CPU buffers.

Please also take a look at per-CPU printk() function redirection mechanism
that got added because of printk()-from-NMI madness ('printk_func'
pointer). It might be useful for your purposes as well.

Jiri Kosina

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at