linux-kernel - Re: [RFC] [PATCH] A clean approach to writeout throttling

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Message-Id: <200712061328.00247.phillips@phunq.net>
Date:	Thu, 6 Dec 2007 13:27:59 -0800
From:	Daniel Phillips <phillips@...nq.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: Re: [RFC] [PATCH] A clean approach to writeout throttling

On Thursday 06 December 2007 12:27, Andrew Morton wrote:
> On Thu, 6 Dec 2007 12:04:14 -0800
>
> Daniel Phillips <phillips@...nq.net> wrote:
> > Any idea
> > how to extend the accounting idea to all tasks involved in a
> > particular block device stack?
>
> SMOP, I'd have thought.

Agreed, which I realized as soon as the post was one minute old.  Sure, 
each helper for the device registers as a helper which puts a pointer 
in the task struct, which points to the accounting info so only one new 
field in task struct.  The more I ponder, the more doable it seems.

> As long as each piece of code which handles 
> data for this stack knows that it's handling data for that stack it
> should be able to account its memory allocations.

Don't forget that we do not actually have a usable notion of "block 
device stack" yet.  Perhaps you are just assuming that is 
easy/imminent?

> The tricky part will be networking allocations because a NIC can of
> course handle data for all sorts of consumers.  But I expect this can
> be greatly simplified with a few heuristics - work out how much
> memory your typical networking stack will allocate for a frame and
> tack that onto the total. Couple of pages worst case..

Actually, the same pattern that Peter and I developed for handling 
network deadlock extends to this accounting concept.  As you say, it's 
a SMOP.

Daniel
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