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Subject: Re: [PATCH 0/3] tracing/perf: perf_trace_buf/perf_xxx hacks.
From: Steven Rostedt <rostedt@goodmis.org>
To: David Ahern <dsahern@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Ingo Molnar <mingo@redhat.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
        "zhangwei(Jovi)" <jovi.zhangwei@huawei.com>,
        linux-kernel@vger.kernel.org
Date: Thu, 20 Jun 2013 14:47:58 -0400
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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