tools lib traceevent: Unregister handler when kmem plugin is unloaded

The kmem handlers should be unregistered when the plugin is unloaded
otherwise they'll try to access invalid memory.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1389839478-5887-6-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/tools/lib/traceevent/plugin_kmem.c b/tools/lib/traceevent/plugin_kmem.c
index 7115c8037ea8..70650ff48d78 100644
--- a/tools/lib/traceevent/plugin_kmem.c
+++ b/tools/lib/traceevent/plugin_kmem.c
@@ -70,3 +70,25 @@ int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
                                       call_site_handler, NULL);
         return 0;
 }
+
+void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
+{
+        pevent_unregister_event_handler(pevent, -1, "kmem", "kfree",
+                                        call_site_handler, NULL);
+
+        pevent_unregister_event_handler(pevent, -1, "kmem", "kmalloc",
+                                        call_site_handler, NULL);
+
+        pevent_unregister_event_handler(pevent, -1, "kmem", "kmalloc_node",
+                                        call_site_handler, NULL);
+
+        pevent_unregister_event_handler(pevent, -1, "kmem", "kmem_cache_alloc",
+                                        call_site_handler, NULL);
+
+        pevent_unregister_event_handler(pevent, -1, "kmem",
+                                        "kmem_cache_alloc_node",
+                                        call_site_handler, NULL);
+
+        pevent_unregister_event_handler(pevent, -1, "kmem", "kmem_cache_free",
+                                        call_site_handler, NULL);
+}