linux-kernel - [RFC PATCH 0/10] relay revamp, third installment

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Date:	Sat, 27 Sep 2008 01:17:41 -0500
From:	Tom Zanussi <zanussi@...cast.net>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Martin Bligh <mbligh@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	prasad@...ux.vnet.ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Steven Rostedt <rostedt@...dmis.org>, od@...e.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, hch@....de,
	David Wilder <dwilder@...ibm.com>
Subject: [RFC PATCH 0/10] relay revamp, third installment

Here's the current relay cleanup patchset.

1-2 make the write path completely replaceable.
3 adds flags along with some related cleanup.
4-8 remove the padding in several stages.

The new patches in this set are:

9 simplifies the callbacks - now that we have flags, the subbuf_start
callback is much simpler, has been combined with notify_consumers and
has been renamed new_subbuf.  Because part of the simplification has
been to handle buffer-full conditions and count lost events internally,
normal applications don't have to pay attention to it at all.

10 completely removes the idea of sub-buffers completely and now deals
only with pages. relay_open() channges accordingly - buffer sizes are
now in pages and consumers are woken only every n_wakeup pages, or never
if this is 0. 

It's a work in progress, but because I wanted the intermediate stages to
actually work and not break anything, some of these patches, especially
05, are just temporary and will be removed in the next iteration.

I didn't have time to clean up the first 3 either - I'll also do that
the next time around.

In the next round I plan to do vmap removal.

Tom

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