linux-kernel - [RFC PATCH 4/9] mm/damon/core: put ops-handled filters to damos->ops

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Message-Id: <20250220193509.36379-5-sj@kernel.org>
Date: Thu, 20 Feb 2025 11:35:04 -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 4/9] mm/damon/core: put ops-handled filters to damos->ops_filters

damos->ops_filters has introduced to be used for operations layer
handled filters.  But DAMON kernel API callers can put any type of DAMOS
filters to any of damos->filters and damos->ops_filters.  DAMON ABI
users have no way other than still using only damos->filters.  Update
damos_add_filter(), which should be used by API callers to install DAMOS
filters, to add core layers and operation layer handled filters to
->filters and ->ops_filters, respectively.  The change is applied to
both API callers and ABI users since ABI users use the API internally.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index ffdd84ff6fa5..78126a5145fd 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -281,9 +281,24 @@ struct damos_filter *damos_new_filter(enum damos_filter_type type,
 	return filter;
 }
 
+static bool damos_filter_for_ops(enum damos_filter_type type)
+{
+	switch (type) {
+	case DAMOS_FILTER_TYPE_ADDR:
+	case DAMOS_FILTER_TYPE_TARGET:
+		return false;
+	default:
+		break;
+	}
+	return true;
+}
+
 void damos_add_filter(struct damos *s, struct damos_filter *f)
 {
-	list_add_tail(&f->list, &s->filters);
+	if (damos_filter_for_ops(f->type))
+		list_add_tail(&f->list, &s->ops_filters);
+	else
+		list_add_tail(&f->list, &s->filters);
 }
 
 static void damos_del_filter(struct damos_filter *f)
-- 
2.39.5