linux-kernel - Re: Unified tracing buffer

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Message-ID: <33307c790809231128w44c79b8y40a821c2989f9b73@mail.gmail.com>
Date:	Tue, 23 Sep 2008 11:28:17 -0700
From:	"Martin Bligh" <mbligh@...gle.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	"Masami Hiramatsu" <mhiramat@...hat.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>,
	systemtap-ml <systemtap@...rces.redhat.com>
Subject: Re: Unified tracing buffer

>> I think the main reason of using single-channel mode is simplicity of
>> userspace reader. We can use 'cat' or 'tail' to read the buffer on-line.
>> I'm not sure how much overhead ftrace-like buffer merging routine has,
>> but if kernel provides an interface which gives us single-merged buffer
>> image(like ftrace buffer), we are grad to use it. :-)
>
> Yup, I also think it is better.

That was the plan, yes. Merge sort is cheap ;-)
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