[PATCH 46/47] perf machine: Do not require /lib/modules/* on a guest

From: Arnaldo Carvalho de Melo
Date: Wed Aug 07 2013 - 17:17:08 EST

From: Jason Wessel <jason.wessel@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Acked-by: David Ahern <dsahern@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1373920073-4874-1-git-send-email-jason.wessel@xxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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)

- 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;


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