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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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