linux-kernel - Re: perf/ftrace: does PERF_EVENT_IOC_SET

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Message-ID: <55773DA3.6070808@gmail.com>
Date:	Tue, 09 Jun 2015 13:25:23 -0600
From:	David Ahern <dsahern@...il.com>
To:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?

On 6/9/15 12:30 PM, Vince Weaver wrote:
> Hello
>
> I've been working on documenting the PERF_EVENT_IOC_SET_FILTER ioctl.
>
> I've been trying for the past 2 days and have been unable to get any
> result except EINVAL.
>
> Does anyone ever use this ioctl?  Does anyone know how to use this ioctl?

yes and yes it works.

perf record -e irq:irq_handler_entry --filter irq==28 \
             -e irq:softirq_entry --filter vec==6 -a \
      -- sleep 5
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