[RFC PATCH V1 1/5] mm/damon: Add NUMA local and remote variables in 'damon_region'

[Xin Hao]

The purpose of adding these two variables 'local' & 'remote'
is to obtain the struct 'damon_region' numa access status.

Signed-off-by: Xin Hao <xhao@xxxxxxxxxxxxxxxxx>
Signed-off-by: Rongwei Wang <rongwei.wang@xxxxxxxxxxxxxxxxx>
---
 include/linux/damon.h | 4 ++++
 mm/damon/core.c       | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 5e1e3a128b77..77d0937dcab5 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -41,6 +41,8 @@ struct damon_addr_range {
  * @nr_accesses:	Access frequency of this region.
  * @list:		List head for siblings.
  * @age:		Age of this region.
+ * @local:		Local numa node accesses.
+ * @remote:		Remote numa node accesses.
  *
  * @age is initially zero, increased for each aggregation interval, and reset
  * to zero again if the access frequency is significantly changed.  If two
@@ -56,6 +58,8 @@ struct damon_region {
 	unsigned int age;
 /* private: Internal value for age calculation. */
 	unsigned int last_nr_accesses;
+	unsigned long local;
+	unsigned long remote;
 };
 
 /**
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 1dd153c31c9e..933ef51afa71 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -45,6 +45,8 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end)
 
 	region->age = 0;
 	region->last_nr_accesses = 0;
+	region->local = 0;
+	region->remote = 0;
 
 	return region;
 }
@@ -740,6 +742,8 @@ static void damon_merge_two_regions(struct damon_target *t,
 
 	l->nr_accesses = (l->nr_accesses * sz_l + r->nr_accesses * sz_r) /
 			(sz_l + sz_r);
+	l->remote = (l->remote * sz_l + r->remote * sz_r) / (sz_l + sz_r);
+	l->local = (l->local * sz_l + r->local * sz_r) / (sz_l + sz_r);
 	l->age = (l->age * sz_l + r->age * sz_r) / (sz_l + sz_r);
 	l->ar.end = r->ar.end;
 	damon_destroy_region(r, t);
@@ -812,6 +816,8 @@ static void damon_split_region_at(struct damon_ctx *ctx,
 
 	new->age = r->age;
 	new->last_nr_accesses = r->last_nr_accesses;
+	new->local = r->local;
+	new->remote = r->remote;
 
 	damon_insert_region(new, r, damon_next_region(r), t);
 }
-- 
2.27.0