linux-kernel - Re: [PATCH 1/9] perf symbols: Remove perf

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Date:	Thu, 4 Feb 2010 10:26:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/9] perf symbols: Remove perf_session usage in symbols
 layer

these changes reintroduce the 'perf top exits' bug:

 $ perf top -v
 map_groups__set_modules_path_dir: cannot open /lib/modules/2.6.33-rc6-tip-00586-g398dde3-dirty/kernel dir

It's the non-existence of modules that causes a disorderly exit. I sent you 
my config with the earlier bugreport - i think if you tried that config you'd 
see a similar failure. I've fixed it via the commit below for now.

	Ingo

------------>
>From 2161db969313cb94ffd9377a525fb75c3fee9eeb Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@...e.hu>
Date: Thu, 4 Feb 2010 10:22:01 +0100
Subject: [PATCH] perf tools: Fix session init on non-modular kernels
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

perf top and perf record refuses to initialize on non-modular kernels:
refuse to initialize:

 $ perf top -v
  map_groups__set_modules_path_dir: cannot open /lib/modules/2.6.33-rc6-tip-00586-g398dde3-dirty/

Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Mackerras <paulus@...ba.org>
LKML-Reference: <1265223128-11786-1-git-send-email-acme@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/util/symbol.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index a60ba2b..6882e9f 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1937,7 +1937,7 @@ int map_groups__create_kernel_maps(struct map_groups *self,
 		return -1;
 
 	if (symbol_conf.use_modules && map_groups__create_modules(self) < 0)
-		return -1;
+		return 0;
 	/*
 	 * Now that we have all the maps created, just set the ->end of them:
 	 */
--
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