linux-kernel - Re: [PATCH 0/3] tracing/perf: perf_trace_buf/perf

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Date:	Thu, 20 Jun 2013 14:53:11 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks.

On Thu, 2013-06-20 at 14:47 -0400, Steven Rostedt wrote:
> On Thu, 2013-06-20 at 12:35 -0600, David Ahern wrote:
> > On 6/20/13 12:23 PM, Steven Rostedt wrote:
> > >
> > > I ran this:
> > >
> > >   perf stat --repeat 100 -- perf bench sched pipe > /tmp/perf-bench-sched.{before, after}
> > 
> > You want to compare:
> >    perf stat --repeat 100 -p 1 -- perf bench sched pipe
> > 
> > so that event is tagged to pid 1 and not the perf-bench workload.
> 
> I guess I'm a bit confused. What's the significance of measuring pid 1
> (init)?

Oh wait, I just noticed Oleg's:

# perf record -e sched:sched_switch -p1 &

I missed that.

bah, time to re-run it.

-- Steve


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