[RFC PATCH v2 1/2] mm/mempolicy: Expose get_il_weight() to MM

[Bijan Tabatabai]

From: Bijan Tabatabai <bijantabatab@xxxxxxxxxx>

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@xxxxxxxxxx>
---
 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