Re: [PATCH] [2.6] PPC64: log firmware errors during boot.

[Greg KH <greg@kroah.com>]

On Thu, Jul 01, 2004 at 04:06:14PM -0500, linas@austin.ibm.com wrote:
> How else could we do this?  I have never had to architect a kernel-to-user
> data communications interface, so I don't know what the alternatives
> are.  We could queue them up to some file in /proc, which user-space
> reads. 

No.

> Or maybe /sys instead ??

No.

> Maybe a stunt with sockets?

Yes, use netlink.

> Some new device in /dev/ that can be opened, read, closed?

No.

> How should the user space daemon indicate that its picked up the
> message and doesn't need it any more?

The kernel doesn't care.

> Write a msg number to a /proc file?

No way.

> Maybe each individual message should go in its own file, and user
> space just rm's that file after its fetched/saved the message.

Hm, that's a neat idea I don't think I've seen before.  But no :)

> I dunno, I think any one of these could be whipped up in a jiffy.
> Convincing the user-space to use the interface might be harder.

In summary, use syslog or netlink like the whole rest of the kernel
does.  Don't reinvent the wheel again, please.

thanks,

greg k-h