linux-kernel - Re: [PATCH] ftrace: add 'version' special file for ring buffer format

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Message-ID: <1300156268.9910.242.camel@gandalf.stny.rr.com>
Date:	Mon, 14 Mar 2011 22:31:08 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Slava Pestov <slavapestov@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mrubin@...gle.com, dhsharp@...gle.com
Subject: Re: [PATCH] ftrace: add 'version' special file for ring buffer
 format

On Mon, 2011-03-14 at 15:42 -0700, Slava Pestov wrote:
> The intention here is that if the ftrace ring buffer format changes
> in the future like it did in the past with ktrace, we can increment
> the version number and update clients appropriately.

I purposely avoided "versions", and instead use the
tracing/events/header_page and .../header_event to describe how the ring
buffer format is laid out. If the format changes, then so should those
files.

-- Steve

> 
> Tested: Verified that special file contains correct content
> 
> This patch is against 2.6.38-rc8 but should apply to any version
> from at least 2.6.34 onwards.
> 
> Signed-Off-By: Slava Pestov <slavapestov@...gle.com>


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