linux-kernel - [PATCHv2] perf tools: Fix pipe check regression in attr event callback

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Date:	Thu, 5 Jun 2014 22:41:17 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: [PATCHv2] perf tools: Fix pipe check regression in attr event
 callback

On Thu, Jun 05, 2014 at 05:21:02PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jun 05, 2014 at 07:00:11PM +0200, Jiri Olsa escreveu:
> > On Thu, Jun 05, 2014 at 06:06:41PM +0200, Stephane Eranian wrote:
> > > Hi Jiri,
> > > 
> > > Somehow, I thought you had written a fix to avoid the problem below.
> > > But when I try with tip.git, the problem is still there.
> > > Could you push your fix ASAP.
> > > 
> > > Thanks.
> > > 
> > > $ perf record -o - noploop 2 |  perf inject -b |  perf report -i -
> > > # To display the perf.data header info, please use
> > > --header/--header-only options.
> > > #
> > > noploop for 2 seconds
> > > 0x1bd0 [0x28]: failed to process type: 9
> > 
> > hum, I remember fixing another issue.. this one is
> > separated one, please try attached patch.
> > 
> > thanks,
> > jirka
> > 
> > 
> > ---
> > The file factoring in builtin-inject.c object introduced regression
> > in attr event callback. The commit is:
> >   3406912 perf inject: Handle output file via perf_data_file object
> > 
> > Following hunk reversed the logic:
> >   -       if (!inject->pipe_output)
> >   +       if (&inject->output.is_pipe)
> 
> Why do we need this '&'? this will always evaluate to true, as it will
> get the address of a variable, also adding a ! before it will just it
> eval to false always, or am I missing something? :-)
> 
> I think this should really be:
> 
>             if (!inject->output.is_pipe)
> 
> No?

aaarhg.. yes ;-) v2 attached

thanks,
jirka

---
The file factoring in builtin-inject.c object introduced regression
in attr event callback. The commit is:
  3406912 perf inject: Handle output file via perf_data_file object

Following hunk reversed the logic:
  -       if (!inject->pipe_output)
  +       if (&inject->output.is_pipe)

putting it back, following example now works:
  $ perf record -o - kill | perf inject -b | perf report -i -

Plus removing extra '&' (kudos to Arnaldo)

Reported-by: Stephane Eranian <eranian@...gle.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-inject.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 6a3af00..16c7c11 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -72,7 +72,7 @@ static int perf_event__repipe_attr(struct perf_tool *tool,
 	if (ret)
 		return ret;
 
-	if (&inject->output.is_pipe)
+	if (!inject->output.is_pipe)
 		return 0;
 
 	return perf_event__repipe_synth(tool, event);
-- 
1.8.3.1

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