linux-kernel - Re: [PATCH 2/4] tracing: add event trace infrastructure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090225103109.GF12352@elte.hu>
Date:	Wed, 25 Feb 2009 11:31:09 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Pekka Paalanen <pq@....fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Martin Bligh <mbligh@...gle.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/4] tracing: add event trace infrastructure


* Peter Zijlstra <peterz@...radead.org> wrote:

> 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; .... }'

yeah.

For /debug/tracing/trace the convention is that a simple:

  grep -v '^#'

pattern will filter out the header as "comments".

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/