linux-kernel - Re: [PATCH -tip v6 00/22] kprobes: introduce NOKPROBE

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Date:	Mon, 23 Dec 2013 14:04:38 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, linux-arch@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>, x86@...nel.org,
	lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	systemtap@...rceware.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH -tip v6 00/22] kprobes: introduce NOKPROBE_SYMBOL(),
 cleanup and fixes crash bugs


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> > I can reproduce one weirdness, with just 13 probes added, 'perf probe 
> > -l' [which should really be 'perf probe list'!] executes very slowly:
> > 
> >  # perf stat --null --repeat 3 perf probe -l
> > 
> >  Performance counter stats for 'perf probe -l' (3 runs):
> > 
> >        0.763640098 seconds time elapsed                                          ( +-  1.61% )
> > 
> > 0.7 seconds is ridiculously long.
> 
> This comes from the perf-probe's internal issue. It tries to get 
> actual lines and files by using debuginfo. I guess most of the time 
> consumed when processing huge kernel debuginfo.

No, I don't have any debuginfo, I never use it.

Thanks,

	Ingo
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