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

include/trace/events/sched.h

+8 −1
Original line number Diff line number Diff line
@@ -156,6 +156,7 @@ TRACE_EVENT(sched_switch, 
		__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			)
@@ -165,13 +166,19 @@ TRACE_EVENT(sched_switch, 
		memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);

		__entry->prev_pid	= prev->pid;

		__entry->prev_prio	= prev->prio;

		__entry->prev_state	= prev->state;

		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);

		__entry->next_pid	= next->pid;

		__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_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)

);