# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1236610894 0
# Node ID d035b66b5b4db5afd42b1ac0bb4ec6bce0c4ece3
# Parent e7702951fc09f97052f55b3ad6bb30df1f4b9cd0
xentrace: trace when we continue with the same task
Trace when the scheduler decides to continue running the same process.
This lets us see that this is happening for one; it also lets us see
domains in a trace which are actively running on pcpu but never
scheduled out.
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
xen/common/schedule.c | 15 +++++++++++++++
xen/include/public/trace.h | 3 ++-
2 files changed, 17 insertions(+), 1 deletion(-)
diff -r e7702951fc09 -r d035b66b5b4d xen/common/schedule.c
--- a/xen/common/schedule.c Mon Mar 09 13:52:59 2009 +0000
+++ b/xen/common/schedule.c Mon Mar 09 15:01:34 2009 +0000
@@ -81,6 +81,20 @@ static inline void trace_runstate_change
__trace_var(event, 1/*tsc*/, sizeof(d), (unsigned char *)&d);
}
+static inline void trace_continue_running(struct vcpu *v)
+{
+ struct { uint32_t vcpu:16, domain:16; } d;
+
+ if ( likely(!tb_init_done) )
+ return;
+
+ d.vcpu = v->vcpu_id;
+ d.domain = v->domain->domain_id;
+
+ __trace_var(TRC_SCHED_CONTINUE_RUNNING, 1/*tsc*/, sizeof(d),
+ (unsigned char *)&d);
+}
+
static inline void vcpu_runstate_change(
struct vcpu *v, int new_state, s_time_t new_entry_time)
{
@@ -803,6 +817,7 @@ static void schedule(void)
if ( unlikely(prev == next) )
{
spin_unlock_irq(&sd->schedule_lock);
+ trace_continue_running(next);
return continue_running(prev);
}
diff -r e7702951fc09 -r d035b66b5b4d xen/include/public/trace.h
--- a/xen/include/public/trace.h Mon Mar 09 13:52:59 2009 +0000
+++ b/xen/include/public/trace.h Mon Mar 09 15:01:34 2009 +0000
@@ -60,7 +60,8 @@
#define TRC_TRACE_WRAP_BUFFER (TRC_GEN + 2)
#define TRC_TRACE_CPU_CHANGE (TRC_GEN + 3)
-#define TRC_SCHED_RUNSTATE_CHANGE (TRC_SCHED_MIN + 1)
+#define TRC_SCHED_RUNSTATE_CHANGE (TRC_SCHED_MIN + 1)
+#define TRC_SCHED_CONTINUE_RUNNING (TRC_SCHED_MIN + 2)
#define TRC_SCHED_DOM_ADD (TRC_SCHED_VERBOSE + 1)
#define TRC_SCHED_DOM_REM (TRC_SCHED_VERBOSE + 2)
#define TRC_SCHED_SLEEP (TRC_SCHED_VERBOSE + 3)
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