1 files changed, 113 insertions, 0 deletions

diff --git a/include/litmus/trace.h b/include/litmus/trace.h
new file mode 100644
index 000000000000..e8e0c7b6cc6a
--- /dev/null
+++ b/include/litmus/trace.h
@@ -0,0 +1,113 @@
+#ifndef _SYS_TRACE_H_
+#define _SYS_TRACE_H_
+
+#ifdef CONFIG_SCHED_OVERHEAD_TRACE
+
+#include <litmus/feather_trace.h>
+#include <litmus/feather_buffer.h>
+
+
+/*********************** TIMESTAMPS ************************/
+
+enum task_type_marker {
+        TSK_BE,
+        TSK_RT,
+        TSK_UNKNOWN
+};
+
+struct timestamp {
+        uint64_t                timestamp;
+        uint32_t                seq_no;
+        uint8_t                 cpu;
+        uint8_t                 event;
+        uint8_t                 task_type;
+};
+
+/* tracing callbacks */
+feather_callback void save_timestamp(unsigned long event);
+feather_callback void save_timestamp_def(unsigned long event, unsigned long type);
+feather_callback void save_timestamp_task(unsigned long event, unsigned long t_ptr);
+feather_callback void save_timestamp_cpu(unsigned long event, unsigned long cpu);
+
+
+#define TIMESTAMP(id) ft_event0(id, save_timestamp)
+
+#define DTIMESTAMP(id, def)  ft_event1(id, save_timestamp_def, def)
+
+#define TTIMESTAMP(id, task) \
+        ft_event1(id, save_timestamp_task, (unsigned long) task)
+
+#define CTIMESTAMP(id, cpu) \
+        ft_event1(id, save_timestamp_cpu, cpu)
+
+#else /* !CONFIG_SCHED_OVERHEAD_TRACE */
+
+#define TIMESTAMP(id)        /* no tracing */
+
+#define DTIMESTAMP(id, def)  /* no tracing */
+
+#define TTIMESTAMP(id, task) /* no tracing */
+
+#define CTIMESTAMP(id, cpu)  /* no tracing */
+
+#endif
+
+
+/* Convention for timestamps
+ * =========================
+ *
+ * In order to process the trace files with a common tool, we use the following
+ * convention to measure execution times: The end time id of a code segment is
+ * always the next number after the start time event id.
+ */
+
+#define TS_SCHED_START                  DTIMESTAMP(100, TSK_UNKNOWN) /* we only
+                                                                      * care
+                                                                      * about
+                                                                      * next */
+#define TS_SCHED_END(t)                 TTIMESTAMP(101, t)
+#define TS_SCHED2_START(t)              TTIMESTAMP(102, t)
+#define TS_SCHED2_END(t)                TTIMESTAMP(103, t)
+
+#define TS_CXS_START(t)                 TTIMESTAMP(104, t)
+#define TS_CXS_END(t)                   TTIMESTAMP(105, t)
+
+#define TS_RELEASE_START                DTIMESTAMP(106, TSK_RT)
+#define TS_RELEASE_END                  DTIMESTAMP(107, TSK_RT)
+
+#define TS_TICK_START(t)                TTIMESTAMP(110, t)
+#define TS_TICK_END(t)                  TTIMESTAMP(111, t)
+
+
+#define TS_PLUGIN_SCHED_START           /* TIMESTAMP(120) */  /* currently unused */
+#define TS_PLUGIN_SCHED_END             /* TIMESTAMP(121) */
+
+#define TS_PLUGIN_TICK_START            /* TIMESTAMP(130) */
+#define TS_PLUGIN_TICK_END              /* TIMESTAMP(131) */
+
+#define TS_ENTER_NP_START               TIMESTAMP(140)
+#define TS_ENTER_NP_END                 TIMESTAMP(141)
+
+#define TS_EXIT_NP_START                TIMESTAMP(150)
+#define TS_EXIT_NP_END                  TIMESTAMP(151)
+
+#define TS_SRP_UP_START                 TIMESTAMP(160)
+#define TS_SRP_UP_END                   TIMESTAMP(161)
+#define TS_SRP_DOWN_START               TIMESTAMP(162)
+#define TS_SRP_DOWN_END                 TIMESTAMP(163)
+
+#define TS_PI_UP_START                  TIMESTAMP(170)
+#define TS_PI_UP_END                    TIMESTAMP(171)
+#define TS_PI_DOWN_START                TIMESTAMP(172)
+#define TS_PI_DOWN_END                  TIMESTAMP(173)
+
+#define TS_FIFO_UP_START                TIMESTAMP(180)
+#define TS_FIFO_UP_END                  TIMESTAMP(181)
+#define TS_FIFO_DOWN_START              TIMESTAMP(182)
+#define TS_FIFO_DOWN_END                TIMESTAMP(183)
+
+#define TS_SEND_RESCHED_START(c)        CTIMESTAMP(190, c)
+#define TS_SEND_RESCHED_END             DTIMESTAMP(191, TSK_UNKNOWN)
+
+
+#endif /* !_SYS_TRACE_H_ */