linux-kernel - LTTng 0.166 for 2.6.31.5 : refactoring/cleanup

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Message-ID: <20091109152711.GA27475@Krystal>
Date:	Mon, 9 Nov 2009 10:27:11 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	ltt-dev@...ts.casi.polymtl.ca
Cc:	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: LTTng 0.166 for 2.6.31.5 : refactoring/cleanup - 32-bit fix

Hi,

A little word to tell about the updated LTTng 0.166, which fixes a trace
session destruction type-size problem on 32-bit machines introduced in
0.165. A simple printk() expecting a size_t rather than an unsigned long
caused this.

Mathieu


* Mathieu Desnoyers (mathieu.desnoyers@...ymtl.ca) wrote:
> Hi,
> 
> I just finished testing the LTTng refactoring. It consists of:
> 
> - Change design to inheritance for channels and buffers.
>   - Eliminate structure duplication for locking/allocation level of buffer and
>     channel.
>   - Remove now unnecessary krefs.
> - Fix cpu hotplug for timers.
> - Cleanups.
> 
> Impact:
> - Cleaner code.
> - Simpler structures for channel/buffers.
> - Smaller d-cache footprint.
> 
> It also permits to change the license of all LTTng modules needed both
> for kernel and user-space tracing to dual LGPL/GPL license.
> 
> Due to the size of this change, review and testing would be very
> welcome. I decided to do it in a separate patch on top of the tree
> rather than rebasing. Considering the size of this modification, going
> over the modified code on a file by file basis rather than looking at
> the patch itself is probably easier.
> 
> I decided to mark the "locked" and "irqoff" locking schemes as "BROKEN"
> for now and focus on the lockless scheme. We could re-create them if
> needed by deriving from the lockless code-base.
> 
> Thanks,
> 
> Mathieu
> 
> -- 
> Mathieu Desnoyers
> OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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