[PATCH 1/2 v2] memcg: add memcg flush tracepoint event

JP Kobryn
2024-10-26T00:48:36Z

This is a tracepoint event that contains the memcg pointer and information
on whether the flush was forced, skipped, and the number of stats updated.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
---
include/trace/events/memcg.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/include/trace/events/memcg.h b/include/trace/events/memcg.h
index 8667e57816d2..dfe2f51019b4 100644
--- a/include/trace/events/memcg.h
+++ b/include/trace/events/memcg.h
@@ -74,6 +74,31 @@ DEFINE_EVENT(memcg_rstat_events, count_memcg_events,
TP_ARGS(memcg, item, val)
);

+TRACE_EVENT(memcg_flush_stats,
+
+ TP_PROTO(struct mem_cgroup *memcg, s64 stats_updates,
+ bool force, bool needs_flush),
+
+ TP_ARGS(memcg, stats_updates, force, needs_flush),
+
+ TP_STRUCT__entry(
+ __field(u64, id)
+ __field(s64, stats_updates)
+ __field(bool, force)
+ __field(bool, needs_flush)
+ ),
+
+ TP_fast_assign(
+ __entry->id = cgroup_id(memcg->css.cgroup);
+ __entry->stats_updates = stats_updates;
+ __entry->force = force;
+ __entry->needs_flush = needs_flush;
+ ),
+
+ TP_printk("memcg_id=%llu stats_updates=%lld force=%d needs_flush=%d",
+ __entry->id, __entry->stats_updates,
+ __entry->force, __entry->needs_flush)
+);

#endif /* _TRACE_MEMCG_H */

--
2.47.0