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SubjectRe: [RFC] [PATCH] sysfs support for Xen attributes
On Thu, Jan 12, 2006 at 01:54:46PM +0100, Gerd Hoffmann wrote:
> Hi,
>
> >>Huh? You can't just throw a "MODULE_VERSION()", and a module_init()
> >>somewhere into the xen code to get this to happen? Then all of your
> >>configurable paramaters show up automagically.
> >
> >No, I can't. Xen does not have modules. Xen loads and runs linux.
>
> You can. Just look at a recent drivers/xen/blkback/blkback.c, the
> module parameters specified there show up in
> /sys/module/blkback/parameters, no matter whenever the code was built
> statically into the kernel or as module (which curently doesn't work for
> blkback anyway ...).
>
> Any read-only attributes can trivially be implemented that way. Simple
> writable stuff (balloon driver?) probably too, I don't know whenever a
> notify callback on parameter changes is possible though.

Yes it is.

> The current /proc files which are not simple attributes such as
> /proc/xen/{privcmd,xenbus} are a bit more tricky, not sure what the best
> approach for these is. privcmd returns a filehandle which is then used
> for ioctls (misc char dev maybe?). xenbus can be opened and (I think)
> read(2) on to listen for any xenbus activity, much like /proc/kmsg.
> Suggestions what to use here instead of procfs? Or just leave it there?

Your own filesystem? You can do that in about 200 lines of code these
days :)

And no, it does not belong in procfs.

thanks,

greg k-h
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