Implement the DAMOS-based cold memory regions proactive reclamation
logic.  The logic treats memory regions that assumed to not be accessed
at all for five or more seconds as cold, and reclaim as soon as found.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 samples/damon/prcl.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c
index 32ccdd91cf55..cf8c6f29d8a3 100644
--- a/samples/damon/prcl.c
+++ b/samples/damon/prcl.c
@@ -49,6 +49,7 @@ static int damon_sample_prcl_after_aggregate(struct damon_ctx *c)
 static int damon_sample_prcl_start(void)
 {
 	struct damon_target *target;
+	struct damos *scheme;
 
 	pr_info("start\n");
 
@@ -75,6 +76,23 @@ static int damon_sample_prcl_start(void)
 
 	ctx->callback.after_aggregation = damon_sample_prcl_after_aggregate;
 
+	scheme = damon_new_scheme(
+			&(struct damos_access_pattern) {
+			.min_sz_region = PAGE_SIZE,
+			.max_sz_region = ULONG_MAX,
+			.min_nr_accesses = 0,
+			.max_nr_accesses = 0},
+			DAMOS_PAGEOUT,
+			0,
+			&(struct damos_quota){},
+			&(struct damos_watermarks){},
+			NUMA_NO_NODE);
+	if (!scheme) {
+		damon_destroy_ctx(ctx);
+		return -ENOMEM;
+	}
+	damon_set_schemes(ctx, &scheme, 1);
+
 	return damon_start(&ctx, 1, true);
 }
 
-- 
2.39.5