On Tue, 26 Aug 2025 20:48:54 +0800 Xiang Gao <[email protected]> wrote:
> From: gaoxiang17 <[email protected]> > > Sometimes, when analyzing some real-time process issues, it is necessary to > know the sched policy. > > Show up in the trace as: > > 72.267374: sched_switch: prev_comm=grep prev_pid=67 prev_prio=19 > prev_state=S ==> next_comm=cat next_pid=66 next_prio=120 next_policy=normal > 72.267594: sched_switch: prev_comm=cat prev_pid=66 prev_prio=120 > prev_state=R+ ==> next_comm=grep next_pid=67 next_prio=19 next_policy=RR > 562.192567: sched_switch: prev_comm=grep prev_pid=85 prev_prio=19 > prev_state=S ==> next_comm=cat next_pid=84 next_prio=120 next_policy=normal > 562.192944: sched_switch: prev_comm=cat prev_pid=84 prev_prio=120 > prev_state=R+ ==> next_comm=grep next_pid=85 next_prio=19 next_policy=FIFO > Peter, Are you OK with extending the sched switch tracepoint? -- Steve > Signed-off-by: gaoxiang17 <[email protected]> > --- > include/trace/events/sched.h | 15 +++++++++++++-- > 1 file changed, 13 insertions(+), 2 deletions(-) > > diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h > index 7b2645b50e78..00336211aca6 100644 > --- a/include/trace/events/sched.h > +++ b/include/trace/events/sched.h > @@ -234,6 +234,7 @@ TRACE_EVENT(sched_switch, > __array( char, next_comm, TASK_COMM_LEN ) > __field( pid_t, next_pid ) > __field( int, next_prio ) > + __field( unsigned int, next_policy ) > ), > > TP_fast_assign( > @@ -244,10 +245,11 @@ TRACE_EVENT(sched_switch, > memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN); > __entry->next_pid = next->pid; > __entry->next_prio = next->prio; > + __entry->next_policy = next->policy; > /* XXX SCHED_DEADLINE */ > ), > > - TP_printk("prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%s%s ==> > next_comm=%s next_pid=%d next_prio=%d", > + TP_printk("prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%s%s ==> > next_comm=%s next_pid=%d next_prio=%d next_policy=%s", > __entry->prev_comm, __entry->prev_pid, __entry->prev_prio, > > (__entry->prev_state & (TASK_REPORT_MAX - 1)) ? > @@ -263,7 +265,16 @@ TRACE_EVENT(sched_switch, > "R", > > __entry->prev_state & TASK_REPORT_MAX ? "+" : "", > - __entry->next_comm, __entry->next_pid, __entry->next_prio) > + __entry->next_comm, __entry->next_pid, __entry->next_prio, > + __print_symbolic(__entry->next_policy, > + { SCHED_NORMAL, "normal" }, > + { SCHED_FIFO, "FIFO" }, > + { SCHED_RR, "RR" }, > + { SCHED_BATCH, "batch" }, > + { SCHED_IDLE, "idle" }, > + { SCHED_DEADLINE, "deadline" }, > + { SCHED_EXT, "sched_ext"}) > + ) > ); > > /*
