[RFC PATCH 16/19] mm/damon: trace probe_hits

[SeongJae Park <sj@kernel.org>]

Introduce a new tracepoint for exposing the per-region per-probe
positive sample count via tracefs.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 include/trace/events/damon.h | 41 ++++++++++++++++++++++++++++++++++++
 mm/damon/core.c              |  1 +
 2 files changed, 42 insertions(+)

diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
index 7e25f4469b81b..121d7bc3a2c27 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h
@@ -130,6 +130,47 @@ TRACE_EVENT(damon_monitor_intervals_tune,
 	TP_printk("sample_us=%lu", __entry->sample_us)
 );
 
+TRACE_EVENT(damon_aggregated_v2,
+
+	TP_PROTO(unsigned int target_id, struct damon_region *r,
+		unsigned int nr_regions),
+
+	TP_ARGS(target_id, r, nr_regions),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, target_id)
+		__field(unsigned int, nr_regions)
+		__field(unsigned long, start)
+		__field(unsigned long, end)
+		__field(unsigned int, nr_accesses)
+		__field(unsigned int, age)
+		__field(unsigned char, probe_hit0)
+		__field(unsigned char, probe_hit1)
+		__field(unsigned char, probe_hit2)
+		__field(unsigned char, probe_hit3)
+	),
+
+	TP_fast_assign(
+		__entry->target_id = target_id;
+		__entry->nr_regions = nr_regions;
+		__entry->start = r->ar.start;
+		__entry->end = r->ar.end;
+		__entry->nr_accesses = r->nr_accesses;
+		__entry->age = r->age;
+		__entry->probe_hit0 = r->probe_hits[0];
+		__entry->probe_hit1 = r->probe_hits[1];
+		__entry->probe_hit2 = r->probe_hits[2];
+		__entry->probe_hit3 = r->probe_hits[3];
+	),
+
+	TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u %u %hhu %hhu %hhu %hhu",
+			__entry->target_id, __entry->nr_regions,
+			__entry->start, __entry->end,
+			__entry->nr_accesses, __entry->age,
+			__entry->probe_hit0, __entry->probe_hit1,
+			__entry->probe_hit2, __entry->probe_hit3)
+);
+
 TRACE_EVENT(damon_aggregated,
 
 	TP_PROTO(unsigned int target_id, struct damon_region *r,
diff --git a/mm/damon/core.c b/mm/damon/core.c
index fe14971d72747..54834b74efef4 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1924,6 +1924,7 @@ static void kdamond_reset_aggregated(struct damon_ctx *c)
 			int i;
 
 			trace_damon_aggregated(ti, r, damon_nr_regions(t));
+			trace_damon_aggregated_v2(ti, r, damon_nr_regions(t));
 			damon_warn_fix_nr_accesses_corruption(r);
 			r->last_nr_accesses = r->nr_accesses;
 			r->nr_accesses = 0;
-- 
2.47.3