linux-kernel - Re: Unified tracing buffer

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Message-Id: <1222162270.16700.57.camel@lappy.programming.kicks-ass.net>
Date:	Tue, 23 Sep 2008 11:31:09 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Tom Zanussi <zanussi@...cast.net>
Cc:	prasad@...ux.vnet.ibm.com, Martin Bligh <mbligh@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Steven Rostedt <rostedt@...dmis.org>, od@...ell.com,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, hch@....de,
	David Wilder <dwilder@...ibm.com>
Subject: Re: Unified tracing buffer

On Tue, 2008-09-23 at 00:25 -0500, Tom Zanussi wrote:

> - get rid of anything having to do with padding, nobody needs it and its
> only affect has been to horribly distort and complicate a lot of the
> code
> - get rid of sub-buffers, they just cause confusion
> - get rid of mmap, nobody uses it
> - no sub-buffers and no mmap support means we can get rid of most of the
> callbacks, and a lot of API confusion along with them
> - add relay flags - they probably should have been used from the
> beginning and options made explicit instead of being shoehorned into the
> callback functions.

 - get rid of the vmap buffers as they cause tlb pressure and eat up
precious vspace on 32 bit platforms.

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