linux-kernel - [RFC PATCH v3 23/37] mm/damon/sysfs: connect sample filters with core layer

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Message-ID: <20251208062943.68824-24-sj@kernel.org>
Date: Sun,  7 Dec 2025 22:29:27 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH v3 23/37] mm/damon/sysfs: connect sample filters with core layer

Only basic file operations are implemented for the DAMON sample filters
sysfs directory.  The user inputs are not really passed to the core
layer.  Make the connection.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index d6b0b6513fd1..3aac2aea6b0c 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1952,6 +1952,35 @@ static inline bool damon_sysfs_kdamond_running(
 		damon_is_running(kdamond->damon_ctx);
 }
 
+static int damon_sysfs_set_sample_filters(
+		struct damon_sample_control *control,
+		struct damon_sysfs_sample_filters *sysfs_filters)
+{
+	int i, err;
+
+	for (i = 0; i < sysfs_filters->nr; i++) {
+		struct damon_sysfs_sample_filter *sysfs_filter =
+			sysfs_filters->filters_arr[i];
+		struct damon_sample_filter *filter;
+
+		filter = damon_new_sample_filter(
+				sysfs_filter->type, sysfs_filter->matching,
+				sysfs_filter->allow);
+		if (!filter)
+			return -ENOMEM;
+		switch (filter->type) {
+		case DAMON_FILTER_TYPE_CPUMASK:
+			filter->cpumask = sysfs_filter->cpumask;
+			break;
+		default:
+			break;
+		}
+		damon_add_sample_filter(control, filter);
+	}
+	return 0;
+}
+
+
 static int damon_sysfs_set_sample_control(
 		struct damon_sample_control *control,
 		struct damon_sysfs_sample *sysfs_sample)
@@ -1960,7 +1989,9 @@ static int damon_sysfs_set_sample_control(
 		sysfs_sample->primitives->page_table;
 	control->primitives_enabled.page_fault =
 		sysfs_sample->primitives->page_fault;
-	return 0;
+
+	return damon_sysfs_set_sample_filters(control,
+			sysfs_sample->filters);
 }
 
 static int damon_sysfs_apply_inputs(struct damon_ctx *ctx,
-- 
2.47.3