linux-kernel - [RFC PATCH 5/6] mm/damon: add node_id to damon_access

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Message-Id: <20250629201443.52569-6-sj@kernel.org>
Date: Sun, 29 Jun 2025 13:14:42 -0700
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 5/6] mm/damon: add node_id to damon_access_report

In future, per-CPU or per-NUMA node monitoring might be required.  We
can add the information in damon_access_report and implement the
damon_report_access() callers filling the information.  And the new
operations set implementation for the per-CPU or per-NUMA node access
monitoring can show and ignore unnecessary reports via
damon_operations->eligible_report() callback.

This commit is for showing the first part of the idea.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 9ec40ce7dde0..29223fea710f 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -111,6 +111,7 @@ struct damon_target {
  * @addr:		The start address of the reporting region.
  * @size:		The size of the reporting region.
  * @nr_accesses:	Number of detected accesses to the region.
+ * @node_id:		NUMA node that made the access.
  *
  * @pid could be stale, and hence shouldn't be de-referenced.
  */
@@ -119,6 +120,7 @@ struct damon_access_report {
 	unsigned long addr;
 	unsigned long size;
 	int nr_accesses;
+	int node_id;
 /* private: */
 	unsigned long report_jiffies;	/* when this report is made */
 };
-- 
2.39.5