mm/damon/core: use a dedicated struct for monitoring attributes

DAMON monitoring attributes are directly defined as fields of 'struct
damon_ctx'.  This makes 'struct damon_ctx' a little long and complicated. 
This commit defines and uses a struct, 'struct damon_attrs', which is
dedicated for only the monitoring attributes to make the purpose of the
five values clearer and simplify 'struct damon_ctx'.

Link: https://lkml.kernel.org/r/20220913174449.50645-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 20 insertions, 10 deletions

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 016b6c9c03d6..2ceee8b07726 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -389,13 +389,15 @@ struct damon_callback {
 };
 
 /**
- * struct damon_ctx - Represents a context for each monitoring.  This is the
- * main interface that allows users to set the attributes and get the results
- * of the monitoring.
+ * struct damon_attrs - Monitoring attributes for accuracy/overhead control.
  *
  * @sample_interval:		The time between access samplings.
  * @aggr_interval:		The time between monitor results aggregations.
  * @ops_update_interval:	The time between monitoring operations updates.
+ * @min_nr_regions:		The minimum number of adaptive monitoring
+ *				regions.
+ * @max_nr_regions:		The maximum number of adaptive monitoring
+ *				regions.
  *
  * For each @sample_interval, DAMON checks whether each region is accessed or
  * not.  It aggregates and keeps the access information (number of accesses to
@@ -405,7 +407,21 @@ struct damon_callback {
  * @ops_update_interval.  All time intervals are in micro-seconds.
  * Please refer to &struct damon_operations and &struct damon_callback for more
  * detail.
+ */
+struct damon_attrs {
+	unsigned long sample_interval;
+	unsigned long aggr_interval;
+	unsigned long ops_update_interval;
+	unsigned long min_nr_regions;
+	unsigned long max_nr_regions;
+};
+
+/**
+ * struct damon_ctx - Represents a context for each monitoring.  This is the
+ * main interface that allows users to set the attributes and get the results
+ * of the monitoring.
  *
+ * @attrs:		Monitoring attributes for accuracy/overhead control.
  * @kdamond:		Kernel thread who does the monitoring.
  * @kdamond_lock:	Mutex for the synchronizations with @kdamond.
  *
@@ -427,15 +443,11 @@ struct damon_callback {
  * @ops:	Set of monitoring operations for given use cases.
  * @callback:	Set of callbacks for monitoring events notifications.
  *
- * @min_nr_regions:	The minimum number of adaptive monitoring regions.
- * @max_nr_regions:	The maximum number of adaptive monitoring regions.
  * @adaptive_targets:	Head of monitoring targets (&damon_target) list.
  * @schemes:		Head of schemes (&damos) list.
  */
 struct damon_ctx {
-	unsigned long sample_interval;
-	unsigned long aggr_interval;
-	unsigned long ops_update_interval;
+	struct damon_attrs attrs;
 
 /* private: internal use only */
 	struct timespec64 last_aggregation;
@@ -448,8 +460,6 @@ struct damon_ctx {
 	struct damon_operations ops;
 	struct damon_callback callback;
 
-	unsigned long min_nr_regions;
-	unsigned long max_nr_regions;
 	struct list_head adaptive_targets;
 	struct list_head schemes;
 };