Add kernel-style events for sched_trace_XXX() functionswip-tracepoints

Enable kernel-style events (tracepoint) for Litmus. Litmus events
trace the same functions as the sched_trace_XXX(), but can be
enabled independently.

So, why another tracing infrastructure then:
- Litmus tracepoints can be recorded and analyzed together (single
  time reference) with all other kernel tracing events (e.g.,
  sched:sched_switch, etc.). It's easier to correlate the effects
  of kernel events on litmus tasks.

- It enables a quick way to visualize and process schedule traces
  using trace-cmd utility and kernelshark visualizer.
  Kernelshark lacks unit-trace's schedule-correctness checks, but
  it enables a fast view of schedule traces and it has several
  filtering options (for all kernel events, not only Litmus').

1 files changed, 82 insertions, 23 deletions

diff --git a/include/litmus/sched_trace.h b/include/litmus/sched_trace.h
index 7ca34cb13881..82bde8241298 100644
--- a/include/litmus/sched_trace.h
+++ b/include/litmus/sched_trace.h
@@ -164,34 +164,93 @@ feather_callback void do_sched_trace_sys_release(unsigned long id,
 
 #endif
 
+#ifdef CONFIG_SCHED_LITMUS_TRACEPOINT
+
+#include <trace/events/litmus.h>
+
+#else
+
+/* Override trace macros to actually do nothing */
+#define trace_litmus_task_param(t)
+#define trace_litmus_task_release(t)
+#define trace_litmus_switch_to(t)
+#define trace_litmus_switch_away(prev)
+#define trace_litmus_task_completion(t, forced)
+#define trace_litmus_task_block(t)
+#define trace_litmus_task_resume(t)
+#define trace_litmus_sys_release(start)
+
+#endif
+
 
 #define SCHED_TRACE_BASE_ID 500
 
 
-#define sched_trace_task_name(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 1, do_sched_trace_task_name, t)
-#define sched_trace_task_param(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 2, do_sched_trace_task_param, t)
-#define sched_trace_task_release(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 3, do_sched_trace_task_release, t)
-#define sched_trace_task_switch_to(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 4, do_sched_trace_task_switch_to, t)
-#define sched_trace_task_switch_away(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 5, do_sched_trace_task_switch_away, t)
-#define sched_trace_task_completion(t, forced) \
-        SCHED_TRACE2(SCHED_TRACE_BASE_ID + 6, do_sched_trace_task_completion, t, \
-                     (unsigned long) forced)
-#define sched_trace_task_block(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 7, do_sched_trace_task_block, t)
-#define sched_trace_task_resume(t) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 8, do_sched_trace_task_resume, t)
-#define sched_trace_action(t, action) \
-        SCHED_TRACE2(SCHED_TRACE_BASE_ID + 9, do_sched_trace_action, t, \
-                     (unsigned long) action);
-/* when is a pointer, it does not need an explicit cast to unsigned long */
-#define sched_trace_sys_release(when) \
-        SCHED_TRACE(SCHED_TRACE_BASE_ID + 10, do_sched_trace_sys_release, when)
+#define sched_trace_task_name(t)                                        \
+        SCHED_TRACE(SCHED_TRACE_BASE_ID + 1,                            \
+                        do_sched_trace_task_name, t)
+
+#define sched_trace_task_param(t)                                       \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 2,                    \
+                                do_sched_trace_task_param, t);          \
+                trace_litmus_task_param(t);                             \
+        } while (0)
+
+#define sched_trace_task_release(t)                                     \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 3,                    \
+                                do_sched_trace_task_release, t);        \
+                trace_litmus_task_release(t);                           \
+        } while (0)
+
+#define sched_trace_task_switch_to(t)                                   \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 4,                    \
+                        do_sched_trace_task_switch_to, t);              \
+                trace_litmus_switch_to(t);                              \
+        } while (0)
+
+#define sched_trace_task_switch_away(t)                                 \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 5,                    \
+                        do_sched_trace_task_switch_away, t);            \
+                trace_litmus_switch_away(t);                            \
+        } while (0)
+
+#define sched_trace_task_completion(t, forced)                          \
+        do {                                                            \
+                SCHED_TRACE2(SCHED_TRACE_BASE_ID + 6,                   \
+                                do_sched_trace_task_completion, t,      \
+                                (unsigned long) forced);                \
+                trace_litmus_task_completion(t, forced);                \
+        } while (0)
+
+#define sched_trace_task_block(t)                                       \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 7,                    \
+                        do_sched_trace_task_block, t);                  \
+                trace_litmus_task_block(t);                             \
+        } while (0)
+
+#define sched_trace_task_resume(t)                                      \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 8,                    \
+                                do_sched_trace_task_resume, t);         \
+                trace_litmus_task_resume(t);                            \
+        } while (0)
+
+#define sched_trace_action(t, action)                                   \
+        SCHED_TRACE2(SCHED_TRACE_BASE_ID + 9,                           \
+                do_sched_trace_action, t, (unsigned long) action);
 
+/* when is a pointer, it does not need an explicit cast to unsigned long */
+#define sched_trace_sys_release(when)                                   \
+        do {                                                            \
+                SCHED_TRACE(SCHED_TRACE_BASE_ID + 10,                   \
+                        do_sched_trace_sys_release, when);              \
+                trace_litmus_sys_release(when);                         \
+        } while (0)
 
 #define sched_trace_quantum_boundary() /* NOT IMPLEMENTED */