linux-kernel - [PATCH 4/7] mm/damon/paddr: implement DAMOS filter type YOUNG

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Date: Fri, 26 Apr 2024 12:52:43 -0700
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,
	Honggyu Kim <honggyu.kim@...com>
Subject: [PATCH 4/7] mm/damon/paddr: implement DAMOS filter type YOUNG

DAMOS filter of type YOUNG is defined, but not yet implemented by any
DAMON operations set.  Add the implementation on 'paddr', the DAMON
operations set for the physical address space.

Signed-off-by: SeongJae Park <sj@...nel.org>
Tested-by: Honggyu Kim <honggyu.kim@...com>
---
 mm/damon/paddr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 310b803c62779..5685ba485097d 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -214,6 +214,11 @@ static bool __damos_pa_filter_out(struct damos_filter *filter,
 			matched = filter->memcg_id == mem_cgroup_id(memcg);
 		rcu_read_unlock();
 		break;
+	case DAMOS_FILTER_TYPE_YOUNG:
+		matched = damon_folio_young(folio);
+		if (matched)
+			damon_folio_mkold(folio);
+		break;
 	default:
 		break;
 	}
-- 
2.39.2