linux-kernel - [tip:perf/core] perf machine: Do not require /lib/modules/ * on a guest

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Date:	Mon, 12 Aug 2013 03:24:11 -0700
From:	tip-bot for Jason Wessel <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, paulus@...ba.org,
	hpa@...or.com, mingo@...nel.org, jason.wessel@...driver.com,
	peterz@...radead.org, dsahern@...il.com, tglx@...utronix.de
Subject: [tip:perf/core] perf machine: Do not require /lib/modules/
 * on a guest

Commit-ID:  8f76fcd902e3b3a7d6f6c695cc8bc053579eb179
Gitweb:     http://git.kernel.org/tip/8f76fcd902e3b3a7d6f6c695cc8bc053579eb179
Author:     Jason Wessel <jason.wessel@...driver.com>
AuthorDate: Mon, 15 Jul 2013 15:27:53 -0500
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 7 Aug 2013 17:35:41 -0300

perf machine: Do not require /lib/modules/* on a guest

For some types of work loads and special guest environments, you might
have a kernel that has no kernel modules.  The perf kvm record tool
fails instantiate vmlinux maps when the kernel modules directory cannot
be opened, even though the kallsyms has been properly processed.  This
leads to a perf kvm report that has no guest symbols resolved.

This patch changes the failure to locate kernel modules to be non-fatal.

Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Acked-by: David Ahern <dsahern@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1373920073-4874-1-git-send-email-jason.wessel@windriver.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/machine.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index ef3b49c..6fcc358 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -806,7 +806,10 @@ static int machine__create_modules(struct machine *machine)
 	free(line);
 	fclose(file);
 
-	return machine__set_modules_path(machine);
+	if (machine__set_modules_path(machine) < 0) {
+		pr_debug("Problems setting modules path maps, continuing anyway...\n");
+	}
+	return 0;
 
 out_delete_line:
 	free(line);
--
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