[PATCH v5 14/36] mm/damon: skip private node memory in DAMON migration and pageout

[Gregory Price]

DAMON operates on physical address ranges, which can cover private
node memory. Skip private-node folios in both DAMON's migration
and reclaim paths.

Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>
---
 mm/damon/paddr.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index e4f98d67461f5..c741a94319750 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -12,6 +12,7 @@
 #include <linux/swap.h>
 #include <linux/memory-tiers.h>
 #include <linux/mm_inline.h>
+#include <linux/node_private.h>
 
 #include "../internal.h"
 #include "ops-common.h"
@@ -250,6 +251,10 @@ static unsigned long damon_pa_pageout(struct damon_region *r,
 			continue;
 		}
 
+		/* private node memory is not reclaimable by default */
+		if (folio_is_private_node(folio))
+			goto put_folio;
+
 		if (damos_pa_filter_out(s, folio))
 			goto put_folio;
 		else
@@ -344,6 +349,10 @@ static unsigned long damon_pa_migrate(struct damon_region *r,
 		else
 			*sz_filter_passed += folio_size(folio) / addr_unit;
 
+		/* private nodes do not support migration by default */
+		if (folio_is_private_node(folio))
+			goto put_folio;
+
 		if (!folio_isolate_lru(folio))
 			goto put_folio;
 		list_add(&folio->lru, &folio_list);
-- 
2.53.0-Meta