linux-kernel - [PATCH 5/5] samples/damon/prcl: implement schemes setup

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Message-Id: <20241210215030.85675-6-sj@kernel.org>
Date: Tue, 10 Dec 2024 13:50:30 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: [PATCH 5/5] samples/damon/prcl: implement schemes setup

Implement a proactive cold memory regions reclaiming logic of prcl
sample module using DAMOS.  The logic treats memory regions that not
accessed at all for five or more seconds as cold, and reclaim those as
soon as found.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 samples/damon/prcl.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c
index b34b9bfed532..c3acbdab7a62 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 +76,25 @@ 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,
+			.min_age_region = 50,
+			.max_age_region = UINT_MAX},
+			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