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

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Date:	Sat, 27 Oct 2007 18:07:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Greg KH <greg@...ah.com>
Cc:	Kay Sievers <kay.sievers@...y.org>,
	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>,
	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 Sat, 2007-10-27 at 09:02 -0700, Greg KH wrote:

> Ah, I see a few problems.  Here, try this version instead.  It's
> compile-tested only, and should be a lot simpler.
> 
> Note, we still are not setting the parent to the new bdi structure
> properly, so the devices will show up in /sys/devices/virtual/ instead
> of in their proper location.  To do this, we need the parent of the
> device, which I'm not so sure what it should be (block device?  block
> device controller?)

The problem is that not every bdi has a sysfs represented parent, hence
the class suggestion. For block devices it is indeed the block device
itself, but for example the NFS client's server descriptor does not have
a sysfs representation.

> Let me know if this works better, I'm off to a kids birthday party for
> the day, but will be around this evening...

Hehe, do enjoy! Thanks.


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