linux-kernel - [RFC PATCH v2 1/2] mm/mempolicy: Expose get_il

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Message-ID: <20250620180458.5041-2-bijan311@gmail.com>
Date: Fri, 20 Jun 2025 13:04:57 -0500
From: Bijan Tabatabai <bijan311@...il.com>
To: damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: sj@...nel.org,
	akpm@...ux-foundation.org,
	david@...hat.com,
	ziy@...dia.com,
	matthew.brost@...el.com,
	joshua.hahnjy@...il.com,
	rakie.kim@...com,
	byungchul@...com,
	gourry@...rry.net,
	ying.huang@...ux.alibaba.com,
	apopple@...dia.com,
	bijantabatab@...ron.com,
	venkataravis@...ron.com,
	emirakhur@...ron.com,
	ajayjoshi@...ron.com,
	vtavarespetr@...ron.com
Subject: [RFC PATCH v2 1/2] mm/mempolicy: Expose get_il_weight() to MM

From: Bijan Tabatabai <bijantabatab@...ron.com>

This patch exposes get_il_weight() in mm/internal.h. This patch is to
allow other parts of the MM subsystem, such as DAMON, to make page
placement decisions based on the global interleave weights.

Signed-off-by: Bijan Tabatabai <bijantabatab@...ron.com>
---
 mm/internal.h  | 6 ++++++
 mm/mempolicy.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/mm/internal.h b/mm/internal.h
index 3823fb356d3b..b718ebe7cad5 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1169,6 +1169,7 @@ extern int node_reclaim_mode;
 
 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
 extern int find_next_best_node(int node, nodemask_t *used_node_mask);
+extern u8 get_il_weight(int node);
 #else
 #define node_reclaim_mode 0
 
@@ -1181,6 +1182,11 @@ static inline int find_next_best_node(int node, nodemask_t *used_node_mask)
 {
 	return NUMA_NO_NODE;
 }
+
+static inline u8 get_il_weight(int node)
+{
+	return 1;
+}
 #endif
 
 static inline bool node_reclaim_enabled(void)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1ff7b2174eb7..b1713430ee9c 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -165,7 +165,7 @@ static unsigned int *node_bw_table;
  */
 static DEFINE_MUTEX(wi_state_lock);
 
-static u8 get_il_weight(int node)
+u8 get_il_weight(int node)
 {
 	struct weighted_interleave_state *state;
 	u8 weight = 1;
-- 
2.43.5