Commit 937cdb9d authored by Steven Rostedt's avatar Steven Rostedt Committed by Frederic Weisbecker
Browse files

tracing: add previous task state info to sched switch event



It is useful to see the state of a task that is being switched out.
This patch adds the output of the state of the previous task in
the context switch event.

[ Impact: see state of switched out task in context switch ]
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent be74b73a
...@@ -156,6 +156,7 @@ TRACE_EVENT(sched_switch, ...@@ -156,6 +156,7 @@ TRACE_EVENT(sched_switch,
__array( char, prev_comm, TASK_COMM_LEN ) __array( char, prev_comm, TASK_COMM_LEN )
__field( pid_t, prev_pid ) __field( pid_t, prev_pid )
__field( int, prev_prio ) __field( int, prev_prio )
__field( long, prev_state )
__array( char, next_comm, TASK_COMM_LEN ) __array( char, next_comm, TASK_COMM_LEN )
__field( pid_t, next_pid ) __field( pid_t, next_pid )
__field( int, next_prio ) __field( int, next_prio )
...@@ -165,13 +166,19 @@ TRACE_EVENT(sched_switch, ...@@ -165,13 +166,19 @@ TRACE_EVENT(sched_switch,
memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN); memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
__entry->prev_pid = prev->pid; __entry->prev_pid = prev->pid;
__entry->prev_prio = prev->prio; __entry->prev_prio = prev->prio;
__entry->prev_state = prev->state;
memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN); memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
__entry->next_pid = next->pid; __entry->next_pid = next->pid;
__entry->next_prio = next->prio; __entry->next_prio = next->prio;
), ),
TP_printk("task %s:%d [%d] ==> %s:%d [%d]", TP_printk("task %s:%d [%d] (%s) ==> %s:%d [%d]",
__entry->prev_comm, __entry->prev_pid, __entry->prev_prio, __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
__entry->prev_state ?
__print_flags(__entry->prev_state, "|",
{ 1, "S"} , { 2, "D" }, { 4, "T" }, { 8, "t" },
{ 16, "Z" }, { 32, "X" }, { 64, "x" },
{ 128, "W" }) : "R",
__entry->next_comm, __entry->next_pid, __entry->next_prio) __entry->next_comm, __entry->next_pid, __entry->next_prio)
); );
......
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