[tip:perf/core] tools lib traceevent: Unregister handler when kmem plugin is unloaded

[tip-bot for Namhyung Kim]

Commit-ID:  11e99c55414ebade1031a0ed3b49915824c7c3ea
Gitweb:     http://git.kernel.org/tip/11e99c55414ebade1031a0ed3b49915824c7c3ea
Author:     Namhyung Kim <namhyung@xxxxxxxxxx>
AuthorDate: Thu, 16 Jan 2014 11:31:11 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 16 Jan 2014 16:26:24 -0300

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@xxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung.kim@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1389839478-5887-6-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/lib/traceevent/plugin_kmem.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tools/lib/traceevent/plugin_kmem.c b/tools/lib/traceevent/plugin_kmem.c
index 7115c80..70650ff 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);
+}
--
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