linux-kernel - Re: SLUB sysfs support

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Date:	Thu, 27 Dec 2007 22:59:47 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Christoph Lameter <clameter@....com>
Cc:	Theodore Tso <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	Willy Tarreau <w@....eu>, Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: SLUB sysfs support

On Thu, Dec 27, 2007 at 12:28:14PM -0800, Christoph Lameter wrote:
> Hmmm.. If I separately allocate the kobject then I can no longer get to 
> the kmem_cache structure from the kobject. 
> 
> I need to add a second kobject_del to sysfs_slab_remove() to make sysfs 
> completely forget about the object?
> 
> Probably should track down any remaining symlinks at that point and nuke 
> them too. Isnt there some way to convince sysfs to remove the symlinks 
> if the target vanishes?

Don't bother with separate allocation.

a) remove symlink when slab goes away
b) instead of kfree() in slab removal do kobject_put() if you have sysfs stuff
c) have ->release() of these kobjects do kfree()
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