[tip: sched/core] tracing/rseq: Add mm_cid field to rseq_update

[tip-bot2 for Mathieu Desnoyers]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     14a8644d4f76fb4afdfcc46e9193af867241bd42
Gitweb:        https://git.kernel.org/tip/14a8644d4f76fb4afdfcc46e9193af867241bd42
Author:        Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
AuthorDate:    Tue, 22 Nov 2022 15:39:23 -05:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Tue, 27 Dec 2022 12:52:15 +01:00

tracing/rseq: Add mm_cid field to rseq_update

Add the mm_cid field to the rseq_update event, allowing tracers to
follow which mm_cid is observed by user-space, and whether negative
mm_cid values are visible in case of internal scheduler implementation
issues.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221122203932.231377-22-mathieu.desnoyers@xxxxxxxxxxxx
---
 include/trace/events/rseq.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/rseq.h b/include/trace/events/rseq.h
index dde7a35..823b47d 100644
--- a/include/trace/events/rseq.h
+++ b/include/trace/events/rseq.h
@@ -17,14 +17,17 @@ TRACE_EVENT(rseq_update,
 	TP_STRUCT__entry(
 		__field(s32, cpu_id)
 		__field(s32, node_id)
+		__field(s32, mm_cid)
 	),
 
 	TP_fast_assign(
 		__entry->cpu_id = raw_smp_processor_id();
 		__entry->node_id = cpu_to_node(__entry->cpu_id);
+		__entry->mm_cid = task_mm_cid(t);
 	),
 
-	TP_printk("cpu_id=%d node_id=%d", __entry->cpu_id, __entry->node_id)
+	TP_printk("cpu_id=%d node_id=%d mm_cid=%d", __entry->cpu_id,
+		  __entry->node_id, __entry->mm_cid)
 );
 
 TRACE_EVENT(rseq_ip_fixup,