From adf9aa9c985dfd72ecf04e17d785689d60ac66e7 Mon Sep 17 00:00:00 2001
From: "Bjoern B. Brandenburg" <bbb@cs.unc.edu>
Date: Tue, 28 Apr 2009 14:54:39 -0400
Subject: add support for tracing IPI latency
---
include/litmus/trace.h | 12 +++++++++++-
litmus/trace.c | 23 +++++++++++++++++++----
2 files changed, 30 insertions(+), 5 deletions(-)
diff --git a/include/litmus/trace.h b/include/litmus/trace.h
index 620d1ac303..e8e0c7b6cc 100644
--- a/include/litmus/trace.h
+++ b/include/litmus/trace.h
@@ -27,12 +27,18 @@ struct timestamp {
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 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 */
@@ -42,6 +48,8 @@ feather_callback void save_timestamp_task(unsigned long event, unsigned long t_p
#define TTIMESTAMP(id, task) /* no tracing */
+#define CTIMESTAMP(id, cpu) /* no tracing */
+
#endif
@@ -98,6 +106,8 @@ feather_callback void save_timestamp_task(unsigned long event, unsigned long t_p
#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_ */
diff --git a/litmus/trace.c b/litmus/trace.c
index 8851198330..6a134121e1 100644
--- a/litmus/trace.c
+++ b/litmus/trace.c
@@ -14,7 +14,8 @@ static struct ftdev overhead_dev;
static unsigned int ts_seq_no = 0;
-static inline void __save_timestamp(unsigned long event, uint8_t type)
+static inline void __save_timestamp_cpu(unsigned long event,
+ uint8_t type, uint8_t cpu)
{
unsigned int seq_no;
struct timestamp *ts;
@@ -23,28 +24,42 @@ static inline void __save_timestamp(unsigned long event, uint8_t type)
ts->event = event;
ts->timestamp = ft_timestamp();
ts->seq_no = seq_no;
- ts->cpu = raw_smp_processor_id();
+ ts->cpu = cpu;
ts->task_type = type;
ft_buffer_finish_write(trace_ts_buf, ts);
}
}
+static inline void __save_timestamp(unsigned long event,
+ uint8_t type)
+{
+ __save_timestamp_cpu(event, type, raw_smp_processor_id());
+}
+
feather_callback void save_timestamp(unsigned long event)
{
__save_timestamp(event, TSK_UNKNOWN);
}
-feather_callback void save_timestamp_def(unsigned long event, unsigned long type)
+feather_callback void save_timestamp_def(unsigned long event,
+ unsigned long type)
{
__save_timestamp(event, (uint8_t) type);
}
-feather_callback void save_timestamp_task(unsigned long event, unsigned long t_ptr)
+feather_callback void save_timestamp_task(unsigned long event,
+ unsigned long t_ptr)
{
int rt = is_realtime((struct task_struct *) t_ptr);
__save_timestamp(event, rt ? TSK_RT : TSK_BE);
}
+feather_callback void save_timestamp_cpu(unsigned long event,
+ unsigned long cpu)
+{
+ __save_timestamp_cpu(event, TSK_UNKNOWN, cpu);
+}
+
/******************************************************************************/
/* DEVICE FILE DRIVER */
/******************************************************************************/
--
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