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

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Message-ID: <5577433C.5040702@gmail.com>
Date:	Tue, 09 Jun 2015 13:49:16 -0600
From:	David Ahern <dsahern@...il.com>
To:	Vince Weaver <vincent.weaver@...ne.edu>
CC:	linux-kernel@...r.kernel.org,
	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 1:51 PM, Vince Weaver wrote:

> # perf record -e irq:irq_handler_entry --filter irq==28 -e irq:softirq_entry --filter vec==6 -a -- sleep 5
> invalid or unsupported event: 'irq:irq_handler_entry'
> Run 'perf list' for a list of valid events
>
> perf list doesn't show any tracepoint events, despite having debugfs
> mounted and running as root and /sys/kernel/debug/tracing/events/ being
> populated.

Do you see this:

# ls /sys/kernel/debug/tracing/events/irq/irq_handler_entry/
enable  filter  format  id  trigger

It's used in kernel/irq/handle.c, handle_irq_event_percpu(). As I recall 
this tracepoint has been around a long time.

David
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