perf kmem: Resolve kernel symbols again

Due to the assumption in perf_session__new that the kernel maps would be
created using the fake PERF_RECORD_MMAP event in a perf.data file 'perf
kmem --stat caller', that doesn't have such event, ends up not being
able to resolve the kernel addresses.

Fix it by calling perf_session__create_kernel_maps() in __cmd_kmem().

LKML-Reference: <new-submission>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 8 insertions, 5 deletions

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 32edb6a86876..7cbb5eb15101 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -489,6 +489,9 @@ static int __cmd_kmem(void)
         if (session == NULL)
                 return -ENOMEM;
 
+        if (perf_session__create_kernel_maps(session) < 0)
+                goto out_delete;
+
         if (!perf_session__has_traces(session, "kmem record"))
                 goto out_delete;
 
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 32765cdca058..9da5e723495c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -52,11 +52,6 @@ out_close:
         return -1;
 }
 
-static inline int perf_session__create_kernel_maps(struct perf_session *self)
-{
-        return map_groups__create_kernel_maps(&self->kmaps, self->vmlinux_maps);
-}
-
 struct perf_session *perf_session__new(const char *filename, int mode, bool force)
 {
         size_t len = filename ? strlen(filename) + 1 : 0;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 6a15daeda577..dffaff52ba44 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -80,6 +80,11 @@ static inline int __perf_session__create_kernel_maps(struct perf_session *self,
                                                 self->vmlinux_maps, kernel);
 }
 
+static inline int perf_session__create_kernel_maps(struct perf_session *self)
+{
+        return map_groups__create_kernel_maps(&self->kmaps, self->vmlinux_maps);
+}
+
 static inline struct map *
         perf_session__new_module_map(struct perf_session *self,
                                      u64 start, const char *filename)