linux-kernel - Re: [PATCH 4/4] (RFC) X86: add IPI tracepoints

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Message-ID: <alpine.LFD.2.11.1407211833330.3647@knanqh.ubzr>
Date:	Mon, 21 Jul 2014 18:35:37 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Davidlohr Bueso <davidlohr@...com>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 4/4] (RFC) X86: add IPI tracepoints

On Sun, 20 Jul 2014, Davidlohr Bueso wrote:

> On Fri, 2014-07-18 at 01:18 -0400, Nicolas Pitre wrote:
> > On X86 there are already tracepoints for IRQ vectors through which IPIs
> > are handled.  However this is highly X86 specific, and the IPI signaling
> > is not currently traced.
> > 
> > This is an attempt at adding generic IPI tracepoints to X86.
> 
> I welcome this, and fwiw have been trying out this patch. One thing I
> would like to see, but due to overhead would probably be better suited
> in userspace (trace-cmd, maybe?), is a more packed description of the
> IPI. Ie: unifying ipi_init and ipi_exit and show overall cost of the
> IPI.

That's best suited for the tool consuming the log in user space.  The 
same is done with IRQ events already.


Nicolas
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