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

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Message-ID: <20071027024033.GB29039@kroah.com>
Date:	Fri, 26 Oct 2007 19:40:33 -0700
From:	Greg KH <greg@...ah.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, Oct 27, 2007 at 03:18:08AM +0200, Peter Zijlstra wrote:
> 
> On Fri, 2007-10-26 at 22:04 +0200, Peter Zijlstra wrote:
> > This crashes and burns on bootup, but I'm too tired to figure out what I
> > did wrong... will give it another try tomorrow..
> 
> Ok, can't sleep.. took a look. I have several problems here.
> 
> The thing that makes it go *boom* is the __ATTR_NULL. Removing that
> makes it boot. Albeit it then warns me of multiple duplicate sysfs
> objects, all named "bdi".
> 
> For some obscure reason this device interface insists on using the
> bus_id as name (?!), and further reduces usability by limiting that to
> 20 odd characters.
> 
> This makes it quite useless. I tried fudging around that limit by using
> device_rename and kobject_rename, but to no avail.
> 
> Really, it should not be this hard to use, trying to expose a handfull
> of simple integers to userspace should not take 8h+ and still not work.
> 
> Peter, who thinks sysfs is contorted mess beyond his skill. I'll stick
> to VM and scheduler code, that actually makes sense.

Heh, that's funny :)

I'll look at this and see what I can come up with.  Would you just like
a whole new patch, or one against this one?

thanks,

greg k-h
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