linux-kernel - Re: SLUB sysfs support

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Message-ID: <Pine.LNX.4.64.0712271601200.1294@schroedinger.engr.sgi.com>
Date:	Thu, 27 Dec 2007 16:02:56 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Al Viro <viro@...IV.linux.org.uk>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: SLUB sysfs support

On Thu, 27 Dec 2007, Al Viro wrote:

> On Thu, Dec 27, 2007 at 03:53:43PM -0800, Christoph Lameter wrote:
> > On Thu, 27 Dec 2007, Christoph Lameter wrote:
> > 
> > > > a) remove symlink when slab goes away
> > > 
> > > Ok. Need to think about how to code that.
> > 
> > How do I iterate over all symlinks in /sys/kernel/slab/*?
> > 
> > I remember trying to do it before and not being able to find a sysfs 
> > method for that.
> 
> What the hell do you need that for?  You have an obvious moment when
> /sys/kernel/slab/cache_name -> <whatever> should be gone - it's when
> you remove the slab called cache_name.  And at that point you don't
> need to iterate over anything - you have the exact name, for fsck sake...
> 
> Why would you want these symlinks to stick around for longer than that?

/sys/kernel/slab/cache_name is a real directory but then there are the 
aliases in /sys/kernel/slab/alias_name pointing to that directory that 
also have to be removed.

So I need to scan for symlinks in /sys/kernel/slab/* pointing to 
/sys/kernel/slab/cache_name.

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