linux-kernel - Re: [PATCH 12/14] perf ftrace: Use pager for displaying result

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Message-ID: <20130506113819.GB1093@krava.brq.redhat.com>
Date:	Mon, 6 May 2013 13:38:19 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 12/14] perf ftrace: Use pager for displaying result

On Mon, May 06, 2013 at 10:52:46AM +0900, Namhyung Kim wrote:
> On Fri, 26 Apr 2013 10:40:23 +0200, Jiri Olsa wrote:
> > On Thu, Apr 25, 2013 at 03:50:45PM +0900, Namhyung Kim wrote:
> >> On Wed, 24 Apr 2013 16:17:24 +0200, Jiri Olsa wrote:
> >> > On Tue, Apr 23, 2013 at 05:31:10PM +0900, Namhyung Kim wrote:
> >> >> From: Namhyung Kim <namhyung.kim@....com>
> >> >> 
> >> >> It's convenient to use pager when seeing many lines of result.
> >> >> 
> >> > for some reason I'm able to get any output for 'live' command only
> >> > when using --no-pager option. I dont get any data for:
> >> >
> >> >   # ./perf ftrace live ls
> >> >
> >> >   not even ls output
> >
> > ok, now with your patch I get allways ls output correctly in pager
> 
> "ls output" only?  What about the ftrace outputs?
> 
> >
> >> >
> >> > But sometime I dont even get ftrace output for:
> >> >
> >> >   # ./perf --no-pager ftrace live ls
> >> >
> >> >   just ls output
> >
> > this one still persists
> 
> Hmm.. still hard to reproduce.. :(
> 
> As it's --no-pager mode, so that it can be reproduced for you without
> this patch, right?

right, I still see the second issue (not getting ftrace output)
regardless of the patch being applied or not

jirka
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