Commit 214db702 authored Jul 04, 2025 by SeongJae Park Committed by Andrew Morton Jul 13, 2025

mm/damon: add trace event for auto-tuned monitoring intervals

Patch series "mm/damon: add trace events for auto-tuned monitoring
intervals and DAMOS quota".

The aim-oriented auto-tuning features for monitoring intervals and DAMOS
quota are important and recommended.  Add tracepoints for observabilities
of those tuned values and the tuning itself.


This patch (of 2):

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.

Link: https://lkml.kernel.org/r/20250704221408.38510-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20250704221408.38510-2-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent 7f810385

include/trace/events/damon.h

+17 −0

Original line number	Diff line number	Diff line
		@@ -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,

mm/damon/core.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}