linux-kernel - [RFC PATCH v3 03/37] mm/damon/core: commit damon_sample

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Message-ID: <20251208062943.68824-4-sj@kernel.org>
Date: Sun,  7 Dec 2025 22:29:07 -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 03/37] mm/damon/core: commit damon_sample_control

The parameters for sampling primitives usage control is not committed
with damon_commit_ctx().  Hence it doesn't work with online parameters
update.  Implement the functionality.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/core.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 7abd8c550c60..89305d42e116 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -559,6 +559,8 @@ struct damon_ctx *damon_new_ctx(void)
 	ctx->attrs.min_nr_regions = 10;
 	ctx->attrs.max_nr_regions = 1000;
 
+	ctx->sample_control.primitives_enabled.page_table = true;
+
 	ctx->addr_unit = 1;
 	ctx->min_sz_region = DAMON_MIN_REGION;
 
@@ -1242,6 +1244,23 @@ static int damon_commit_targets(
 	return 0;
 }
 
+static bool damon_primitives_enabled_invalid(
+		struct damon_primitives_enabled *config)
+{
+	return config->page_table == config->page_fault;
+}
+
+static int damon_commit_sample_control(
+		struct damon_sample_control *dst,
+		struct damon_sample_control *src)
+{
+	if (damon_primitives_enabled_invalid(&src->primitives_enabled))
+		return -EINVAL;
+
+	dst->primitives_enabled = src->primitives_enabled;
+	return 0;
+}
+
 /**
  * damon_commit_ctx() - Commit parameters of a DAMON context to another.
  * @dst:	The commit destination DAMON context.
@@ -1278,6 +1297,8 @@ int damon_commit_ctx(struct damon_ctx *dst, struct damon_ctx *src)
 			return err;
 	}
 	dst->ops = src->ops;
+	err = damon_commit_sample_control(&dst->sample_control,
+			&src->sample_control);
 	if (err)
 		return err;
 	dst->addr_unit = src->addr_unit;
-- 
2.47.3