[RFC PATCH v2 2/4] mm/damon: Introduce DAMOS_QUOTA_HUGEPAGE auto tuning

[gutierrez.asier]

From: Asier Gutierrez <gutierrez.asier@xxxxxxxxxxxxxxxxxxx>

Introduce DAMOS_QUOTA_HUGEPAGE auto tuning Add a new DAMOS quota goal
metric to measure the amount of huge page consumption to total
anonymous memory consumption ratio.

Signed-off-by: Asier Gutierrez <gutierrez.asier@xxxxxxxxxxxxxxxxxxx>
---
 include/linux/damon.h |  1 +
 mm/damon/core.c       | 15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index c7a31572689b..8e15a674e893 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -177,6 +177,7 @@ enum damos_quota_goal_metric {
 	DAMOS_QUOTA_ACTIVE_MEM_BP,
 	DAMOS_QUOTA_INACTIVE_MEM_BP,
 	DAMOS_QUOTA_NODE_ELIGIBLE_MEM_BP,
+	DAMOS_QUOTA_HUGEPAGE,
 	NR_DAMOS_QUOTA_GOAL_METRICS,
 };
 
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 9f38deddcb30..1f1cf10aa241 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2536,6 +2536,18 @@ static unsigned int damos_get_in_active_mem_bp(bool active_ratio)
 	return mult_frac(inactive, 10000, total);
 }
 
+/*
+ * Returns anon hugepage memory to total anon memory use ratio.
+ */
+static unsigned int damos_get_used_hugepage_mem_bp(void)
+{
+	unsigned long used_hugepages, total_used;
+ 
+	used_hugepages = global_node_page_state(NR_ANON_THPS);
+	total_used = global_node_page_state(NR_ANON_MAPPED);
+	return mult_frac(used_hugepages, 10000, total_used);
+}
+
 static void damos_set_quota_goal_current_value(struct damon_ctx *c,
 		struct damos *s, struct damos_quota_goal *goal)
 {
@@ -2567,6 +2579,9 @@ static void damos_set_quota_goal_current_value(struct damon_ctx *c,
 		goal->current_value = damos_get_node_eligible_mem_bp(c, s,
 				goal->nid);
 		break;
+	case DAMOS_QUOTA_HUGEPAGE:
+		goal->current_value = damos_get_used_hugepage_mem_bp();
+		break;
 	default:
 		break;
 	}
-- 
2.43.0