linux-kernel - [RFC PATCH 2/9] mm/damon/paddr: support ops

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Message-Id: <20250220193509.36379-3-sj@kernel.org>
Date: Thu, 20 Feb 2025 11:35:02 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 2/9] mm/damon/paddr: support ops_filters

DAMON keeps all DAMOS filters in damos->filters, and will make
damos->ops_filters to have all operations layer handled DAMOS filters
with upcoming changes.  But DAMON physical address space operations set
implementation (paddr) is handling only damos->filters.  To avoid any
breakage during the upcoming change, make paddr to handle both.  After
the change is made, ->filters support on paddr can be safely removed.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/paddr.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 25090230da17..3e651308ba5d 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -257,6 +257,10 @@ static bool damos_pa_filter_out(struct damos *scheme, struct folio *folio)
 		if (damos_pa_filter_match(filter, folio))
 			return !filter->allow;
 	}
+	damos_for_each_ops_filter(filter, scheme) {
+		if (damos_pa_filter_match(filter, folio))
+			return !filter->allow;
+	}
 	return false;
 }
 
@@ -287,6 +291,12 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s,
 			break;
 		}
 	}
+	damos_for_each_ops_filter(filter, s) {
+		if (filter->type == DAMOS_FILTER_TYPE_YOUNG) {
+			install_young_filter = false;
+			break;
+		}
+	}
 	if (install_young_filter) {
 		filter = damos_new_filter(
 				DAMOS_FILTER_TYPE_YOUNG, true, false);
@@ -535,6 +545,8 @@ static bool damon_pa_scheme_has_filter(struct damos *s)
 
 	damos_for_each_filter(f, s)
 		return true;
+	damos_for_each_ops_filter(f, s)
+		return true;
 	return false;
 }
 
-- 
2.39.5