tools lib traceevent: Add flag to not load event plugins

Add a flag to pevent that will let the callers be able to set it and
keep the system, and perhaps even normal plugins from being loaded.

This is useful when plugins might hide certain information and seeing
the raw events shows what may be going on.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20140603032223.678098063@goodmis.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

2 files changed, 8 insertions, 1 deletions

diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index feab94281634..a68ec3d8289f 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -354,6 +354,8 @@ enum pevent_func_arg_type {
 
 enum pevent_flag {
         PEVENT_NSEC_OUTPUT              = 1,    /* output in NSECS */
+        PEVENT_DISABLE_SYS_PLUGINS      = 1 << 1,
+        PEVENT_DISABLE_PLUGINS          = 1 << 2,
 };
 
 #define PEVENT_ERRORS                                                         \
diff --git a/tools/lib/traceevent/event-plugin.c b/tools/lib/traceevent/event-plugin.c
index 0c8bf6780e4d..317466bd1a37 100644
--- a/tools/lib/traceevent/event-plugin.c
+++ b/tools/lib/traceevent/event-plugin.c
@@ -148,12 +148,17 @@ load_plugins(struct pevent *pevent, const char *suffix,
         char *path;
         char *envdir;
 
+        if (pevent->flags & PEVENT_DISABLE_PLUGINS)
+                return;
+
         /*
          * If a system plugin directory was defined,
          * check that first.
          */
 #ifdef PLUGIN_DIR
-        load_plugins_dir(pevent, suffix, PLUGIN_DIR, load_plugin, data);
+        if (!(pevent->flags & PEVENT_DISABLE_SYS_PLUGINS))
+                load_plugins_dir(pevent, suffix, PLUGIN_DIR,
+                                 load_plugin, data);
 #endif
 
         /*