Report priorities in 'short' and prev_state in 'int' to save
some buffer space. And also reorder the fields so that we take
struct alignment into consideration to make the record compact.
Suggested-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Ze Gao <zegao@xxxxxxxxxxx>
---
include/trace/events/sched.h | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index fbb99a61f714..7d34db20b2c6 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -187,7 +187,7 @@ DEFINE_EVENT(sched_wakeup_template, sched_wakeup_new,
TP_ARGS(p));
#ifdef CREATE_TRACE_POINTS
-static inline long __trace_sched_switch_state(bool preempt,
+static inline int __trace_sched_switch_state(bool preempt,
unsigned int prev_state,
struct task_struct *p)
{
@@ -229,23 +229,23 @@ TRACE_EVENT(sched_switch,
TP_ARGS(preempt, prev, next, prev_state),
TP_STRUCT__entry(
- __array( char, prev_comm, TASK_COMM_LEN )
__field( pid_t, prev_pid )
- __field( int, prev_prio )
- __field( long, prev_state )
- __array( char, next_comm, TASK_COMM_LEN )
__field( pid_t, next_pid )
- __field( int, next_prio )
+ __field( short, prev_prio )
+ __field( short, next_prio )
+ __field( int, prev_state )
+ __array( char, prev_comm, TASK_COMM_LEN )
+ __array( char, next_comm, TASK_COMM_LEN )
),
TP_fast_assign(
- memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
- __entry->prev_pid = prev->pid;
- __entry->prev_prio = prev->prio;
- __entry->prev_state = __trace_sched_switch_state(preempt, prev_state, prev);
+ __entry->prev_pid = prev->pid;
+ __entry->next_pid = next->pid;
+ __entry->prev_prio = (short) prev->prio;
+ __entry->next_prio = (short) next->prio;
+ __entry->prev_state = __trace_sched_switch_state(preempt, prev_state, prev);
memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
- __entry->next_pid = next->pid;
- __entry->next_prio = next->prio;
+ memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
/* XXX SCHED_DEADLINE */
),
--
2.41.0
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