[PATCH 1/2] mm/damon: add trace event for auto-tuned monitoring intervals
From: SeongJae Park <sj@kernel.org>
Date: 2025-07-04 22:14:14
Also in:
damon, linux-mm, lkml
Subsystem:
damon, memory management, the rest, tracing · Maintainers:
SJ Park, Andrew Morton, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Aim-oriented monitoring intervals auto-tuning is an important and recommended feature for DAMON users. Add a trace event for the observability of the tuned intervals and tuning itself. Signed-off-by: SeongJae Park <sj@kernel.org> --- include/trace/events/damon.h | 17 +++++++++++++++++ mm/damon/core.c | 1 + 2 files changed, 18 insertions(+)
diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
index da4bd9fd1162..32c611076023 100644
--- a/include/trace/events/damon.h
+++ b/include/trace/events/damon.h@@ -48,6 +48,23 @@ TRACE_EVENT_CONDITION(damos_before_apply, __entry->nr_accesses, __entry->age) ); +TRACE_EVENT(damon_monitor_intervals_tune, + + TP_PROTO(unsigned long sample_us), + + TP_ARGS(sample_us), + + TP_STRUCT__entry( + __field(unsigned long, sample_us) + ), + + TP_fast_assign( + __entry->sample_us = sample_us; + ), + + TP_printk("sample_us=%lu", __entry->sample_us) +); + 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 979b29e16ef4..57a1ace4d10d 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c@@ -1490,6 +1490,7 @@ static void kdamond_tune_intervals(struct damon_ctx *c) new_attrs.sample_interval); new_attrs.aggr_interval = new_attrs.sample_interval * c->attrs.aggr_samples; + trace_damon_monitor_intervals_tune(new_attrs.sample_interval); damon_set_attrs(c, &new_attrs); }
--
2.39.5