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

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Date:	Wed, 10 Oct 2007 10:30:22 -0700
From:	Greg KH <greg@...ah.com>
To:	Martin Bligh <mbligh@...igh.org>
Cc:	Tejun Heo <htejun@...il.com>, ebiederm@...ssion.com,
	cornelia.huck@...ibm.com, stern@...land.harvard.edu,
	kay.sievers@...y.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET 3/4] sysfs: divorce sysfs from kobject and driver
	model

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 :)

> (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)

thanks,

greg k-h
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