linux-kernel - Re: per BDI dirty limit (was Re: -mm merge plans for 2.6.24)

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Date:	Fri, 26 Oct 2007 17:33:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	Fengguang Wu <fengguang.wu@...il.com>, greg@...ah.com,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Miklos Szeredi <miklos@...redi.hu>
Subject: Re: per BDI dirty limit (was Re: -mm merge plans for 2.6.24)

On Fri, 2007-10-26 at 17:33 +0200, Kay Sievers wrote:
> On Fri, 2007-10-26 at 17:22 +0200, Peter Zijlstra wrote:
> > On Fri, 2007-10-26 at 17:10 +0200, Kay Sievers wrote:
> > > On Fri, 2007-10-26 at 16:48 +0200, Peter Zijlstra wrote:
> > > 
> > > > I appreciate the sysfs people their opinion that /sys/bdi/ might not be the
> > > > best from their POV, however I'm not seeing where to hook the BDI object from
> > > > so that it all makes sense, a few of the things are currently not exposed in
> > > > sysfs at all, like the NFS and FUSE things.
> > > 
> > > What happended to the idea to create a "bdi" class, and have the
> > > existing devices as parents, and for stuff that is not (not now, or
> > > never) in sysfs, no parent is set.
> > 
> > Must have forgotten about that, mainly because I'm not sure I fully
> > understand it.
> > 
> > So we create a class,
> 
> Yes.
> 
> > create these objects,
> 
> Yes, "struct device" objects, assigned to the "bdi" class. (Don't use
> class_device, that will be removed soon.)
> 
> > which are all called bdi
> 
> Probably not. You can name it how you want, you can inherit the name of
> the parent, or prefix it with whatever fits, they just need to be
> unique. Things like the "fuse-%llu" name would work just fine. I guess
> you already solved that problem in the debugfs directory.
> 
> > and have children with these attributes in it.
> 
> The attributes would just be files in the device object.
> 
> > Now, I supposed there is a directory that lists all unparented thingies,
> > how do I locate the one that matches my nfs mount?
> 
> You look for the name (prefix), try: "ls /sys/class/sound/", it's the
> same model all over the place.

Ok, will try that. Is there a 'simple uncluttered' example I could look
at to copy from?


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