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

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Message-ID: <20090116194151.GG6562@ghostprotocols.net>
Date:	Fri, 16 Jan 2009 17:41:51 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] ftrace interface for blktrace

Em Fri, Jan 16, 2009 at 02:15:55PM -0500, Steven Rostedt escreveu:
> 
> Arnaldo,
> 
> Cool stuff!
> 
> On Fri, 16 Jan 2009, Arnaldo Carvalho de Melo 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.
> > 
> > 	Example usage:
> > 
> > [root@...-1 ~]# mount -t debugfs none /sys/kernel/debug/
> 
> I think you are the only person that mounts debugfs on the "official"
> location ;-)
> 
> > [root@...-1 ~]# ls /sys/block/sda/sda1/trace/
> > act_mask  enable  end_lba  pid  start_lba
> > [root@...-1 ~]# cat /sys/kernel/debug/tracing/available_tracers 
> > blk function_graph wakeup function sched_switch nop
> > [root@...-1 ~]# echo blk > /sys/kernel/debug/tracing/current_tracer 
> 
> You must like to type.

Nah, autocompletion and 'set -o vi' command line editing makes it easy,
but yes, one could mount it as:

# mkdir /d
# mount -t debugfs none /d

:-)

Other than that, I guess the implementation must be OK, huh? :-)

Well, off to play fat boys soccer.

- Arnaldo 
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