linux-kernel - Re: [RFC][PATCH] ftrace interface for blktrace

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Message-ID: <20090117190913.GA17722@elte.hu>
Date:	Sat, 17 Jan 2009 20:09:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] ftrace interface for blktrace

* Arnaldo Carvalho de Melo <acme@...hat.com> wrote:

> Hi Jens,
> 
> 	The patch below adds a ftrace interface for blktrace, allowing 
> people to use it without any required userspace tools, using sysfs to 
> setup the act_mask, pid, start_lba, end_lba.

Very nice patch!

Jens, i'm wondering what's your take on this direction is. I think the 
consolidation effect is great and the built-in IO tracing capabilities are 
very nice.

We can still get the raw events too and do user-space post-processing, 
when that is desired - so this does not limit anything that blktrace was 
able to do before - it only extends on it.

Is there any particular blktrace feature you can think of that is not 
present in the blktrace ftrace plugin?

	Ingo
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