linux-kernel - Re: [PATCH] ring_buffer: enlarge RB_MAX_SMALL

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Message-Id: <1239805420.21121.72.camel@localhost.localdomain>
Date:	Wed, 15 Apr 2009 10:23:40 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ring_buffer: enlarge RB_MAX_SMALL_DATA


On Wed, 2009-04-15 at 16:12 +0200, Ingo Molnar wrote:
> * Steven Rostedt <srostedt@...hat.com> wrote:

> Yeah - format specifications are always good. They weaken ABI 
> bindings and allow more flexibility both on the tool and the kernel 
> side.
> 
> > We could ask Linus to pull this into 30 because it is a API 
> > change.
> 
> Apps could assume if the format file is not there it's the .30 
> format.

My fear is that they are written before the change, and will not know
about a format file existing. Then those apps will break on 31.

But this is still new, and the only user I know of at the moment is the
University student doing the ftrace GUI. I'll keep him informed.

Thanks,

-- Steve


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