Re: [PATCHSET 3/4] sysfs: divorce sysfs from kobject and driver model

[Martin Bligh <mbligh@mbligh.org>]

Greg KH wrote:
> On Wed, Oct 10, 2007 at 10:24:43AM -0700, Martin Bligh wrote:
> > > The rules for sysfs files are the following:
> > > 	- one value, in text format, per file.
> > > 	- no action apon open/close
> > > 	- binary files are only allowed for "pass-through" type files
> > > 	  that the kernel does not touch (like for firmware and pci
> > > 	  config space)
> > > 	- directories should be associated with a kobject where it makes
> > > 	  sense (no nesting deep subdirectories without a kobject
> > > 	  present)
> > > 	- when a directory is created/removed, a uevent should happen
> > > 	  declaring what type of device was created/removed.
> > So you'll be removing:
> >
> > /sys/devices/system/node/node?/meminfo
> >
> > then?
> >
> > along with:
> >
> > /sys/devices/system/node/node?/distance
> > /sys/devices/system/node/node?/numastat
> >
> > and all the other things that violate the rules?
>
> I would love to do that :)
>
> And that goes to show how trying to enforce these kinds of rules is damm
> hard.  Things slip by that I never notice because they are only for odd
> types of hardware :)

Is there no way to enforce that in the sysfs interface?
(Haven't looked, I'll admit).

> > (which I do agree with ... I just don't think sysfs works for
> > performance stats as we've discussed several times before ;-))
>
> I agree that this doesn't work too, but also that if it's really needed,
> it can be done, just let us know about it (like
> /sys/block/BLOCKDEV/stat)

OK. Would be nice if we could get rid of /sys/devices/system at
some point, which seems like a fairly crazy path, but still ;-)

M.
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