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

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Message-ID: <1371754078.18733.106.camel@gandalf.local.home>
Date:	Thu, 20 Jun 2013 14:47:58 -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 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)?

-- Steve


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