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Subject: Re: [PATCH 2/4] tracing: add event trace infrastructure
From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, Ingo Molnar <mingo@elte.hu>,
       Steven Rostedt <rostedt@goodmis.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>,
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       Jens Axboe <jens.axboe@oracle.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       Steven Rostedt <srostedt@redhat.com>
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Date: Wed, 25 Feb 2009 10:26:22 +0100
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On Wed, 2009-02-25 at 01:22 -0800, Andrew Morton wrote:

> Parse this:
> 
> irqsoff latency trace v1.1.5 on 2.6.26-rc8
> --------------------------------------------------------------------
>  latency: 97 us, #3/3, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
>     -----------------
>     | task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0)
>     -----------------
>  => started at: apic_timer_interrupt
>  => ended at:   do_softirq
> 
> #                _------=> CPU#
> #               / _-----=> irqs-off
> #              | / _----=> need-resched
> #              || / _---=> hardirq/softirq
> #              ||| / _--=> preempt-depth
> #              |||| /
> #              |||||     delay
> #  cmd     pid ||||| time  |   caller
> #     \   /    |||||   \   |   /
>   <idle>-0     0d..1    0us+: trace_hardirqs_off_thunk (apic_timer_interrupt)
>   <idle>-0     0d.s.   97us : __do_softirq (do_softirq)
>   <idle>-0     0d.s1   98us : trace_hardirqs_on (do_softirq)
> 
> your time starts now.

awk '/^#/ { start=1; next } { if (!start) next; .... }'