linux-kernel - Re: How to write marker info in MMIO trace from kernel

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Message-ID: <4BE09F42.9070909@lwfinger.net>
Date:	Tue, 04 May 2010 17:27:14 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	rostedt@...dmis.org
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: How to write marker info in MMIO trace from kernel

On 05/04/2010 01:42 PM, Steven Rostedt wrote:
> On Tue, 2010-05-04 at 13:36 -0500, Larry Finger wrote:
>> Stephen,
>>
>> I hope you are the correct person for this question.
>>
>> I would like to write information into the MMIO trace file similar to
>> what the user space write to /sys/.../trace_marker would accomplish,
>> however, I want to do it in place of printk statements in the driver I'm
>> tracing. Do you have any suggestions on how to do this? I have tools to
>> merge the trace dump with dmesg output, but the latter lags behind and I
>> do not get good correlation.
> 
> You can use "trace_printk()". I think that is what you are looking for.

Thanks for the info. One other question - when I write only mmiotrace to
the current_tracer, the trace_printk() stuff does not end up in the
buffer. I can get it by using the "sysprof" tracer, but that has a lot
of stuff I do not want. Did I miss some configuration? My list of
available tracers is "blk kmemtrace mmiotrace wakeup_rt wakeup function
sysprof sched_switch nop".

Thanks,

Larry
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