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

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Date:	Wed, 10 Oct 2007 11:26:32 -0700
From:	Martin Bligh <mbligh@...igh.org>
To:	Greg KH <greg@...ah.com>
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

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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