linux-kernel - [RFC PATCH 1/5] mm/damon/core: add DAMOS_QUOTA_NODE_SYS

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Message-ID: <20260123045733.6954-2-ravis.opensrc@gmail.com>
Date: Thu, 22 Jan 2026 20:57:24 -0800
From: Ravi Jonnalagadda <ravis.opensrc@...il.com>
To: damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Cc: sj@...nel.org,
	akpm@...ux-foundation.org,
	corbet@....net,
	bijan311@...il.com,
	ajayjoshi@...ron.com,
	Ravi Jonnalagadda <ravis.opensrc@...il.com>
Subject: [RFC PATCH 1/5] mm/damon/core: add DAMOS_QUOTA_NODE_SYS_BP metric

Add a node-scoped "system bp" goal metric for PA-based migration
control.

This metric represents basis points (bp, 1/10,000) for
(scheme-eligible bytes on node nid) / (system total bytes)

Signed-off-by: Ravi Jonnalagadda <ravis.opensrc@...il.com>
---
 include/linux/damon.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index 3813373a9200..ec5ed1a217fc 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -155,6 +155,7 @@ enum damos_action {
  * @DAMOS_QUOTA_NODE_MEM_FREE_BP:	MemFree ratio of a node.
  * @DAMOS_QUOTA_NODE_MEMCG_USED_BP:	MemUsed ratio of a node for a cgroup.
  * @DAMOS_QUOTA_NODE_MEMCG_FREE_BP:	MemFree ratio of a node for a cgroup.
+ * @DAMOS_QUOTA_NODE_SYS_BP:		Scheme-eligible bytes ratio of a node.
  * @NR_DAMOS_QUOTA_GOAL_METRICS:	Number of DAMOS quota goal metrics.
  *
  * Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupported.
@@ -166,6 +167,7 @@ enum damos_quota_goal_metric {
 	DAMOS_QUOTA_NODE_MEM_FREE_BP,
 	DAMOS_QUOTA_NODE_MEMCG_USED_BP,
 	DAMOS_QUOTA_NODE_MEMCG_FREE_BP,
+	DAMOS_QUOTA_NODE_SYS_BP,
 	NR_DAMOS_QUOTA_GOAL_METRICS,
 };
 
-- 
2.43.0