linux-kernel - Re: [PATCH] ARM: trace: Add tracepoint for the Inter Processor Interrupt

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Date:	Tue, 15 Oct 2013 19:33:46 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	fweisbec@...il.com, mingo@...hat.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org, shaojie.sun@...aro.org
Subject: Re: [PATCH] ARM: trace: Add tracepoint for the Inter Processor
 Interrupt

On Tue, 15 Oct 2013 08:26:15 +0200
Daniel Lezcano <daniel.lezcano@...aro.org> wrote:


> Mmh, I have a doubt here about the trace. I can remove the cpumask 
> because it is not used but in the other hand, it would be interesting to 
> have in the trace the cpumask of the recipient cpus for the IPI. 
> Unfortunately, I don't know how to convert this cpumask to a string 
> without using the cpumask_scnprintf which imply a more complex print trace.
> 
> Do you have some advices for that ?

What's wrong with recording the cpumask into the trace buffer and then
using cpumask_scnprintf() as output? We can update trace-cmd and
libtraceevent to handle that output too.

-- Steve

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