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

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Message-ID: <1405887954.11927.5.camel@buesod1.americas.hpqcorp.net>
Date:	Sun, 20 Jul 2014 13:25:54 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
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 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.

Thanks,
Davidlohr

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