Re: [PATCH v2 1/1] tracing/sched: add 'next_policy' to trace_sched_switch
From: Steven Rostedt <rostedt@goodmis.org>
Date: 2025-09-12 14:30:01
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- 2025-08-23 · [PATCH v2 1/1] tracing/sched: add 'next_policy' to trace_sched_switch · Xiang Gao <hidden>
On Tue, 26 Aug 2025 20:48:54 +0800 Xiang Gao [off-list ref] wrote:
From: gaoxiang17 <redacted> 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
quoted hunk ↗ jump to hunk
Signed-off-by: gaoxiang17 <redacted> --- 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"}) + ) ); /*