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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2025 15:36:33.3359 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9dfae0b2-3562-4f71-f1a7-08dddb485905 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017099.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9336 Content-Type: text/plain; charset="utf-8" These fallback target nodes are used as hints for migration when current target node is near full. TBD: Implementing migration to fallback nodes Signed-off-by: Raghavendra K T --- mm/kscand.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/mm/kscand.c b/mm/kscand.c index 641150755517..a88df9ac2eaa 100644 --- a/mm/kscand.c +++ b/mm/kscand.c @@ -136,6 +136,7 @@ struct kscand_scanctrl { struct kscand_nodeinfo *nodeinfo[MAX_NUMNODES]; unsigned long address; unsigned long nr_to_scan; + nodemask_t nmask; }; =20 struct kscand_scanctrl kscand_scanctrl; @@ -148,6 +149,8 @@ struct kmigrated_mm_slot { spinlock_t migrate_lock; /* Head of per mm migration list */ struct list_head migrate_head; + /* Indicates set of fallback nodes to migrate. */ + nodemask_t migration_nmask; /* Indicates weighted success, failure */ int msuccess, mfailed, fratio; }; @@ -522,6 +525,7 @@ static void reset_scanctrl(struct kscand_scanctrl *scan= ctrl) { int node; =20 + nodes_clear(scanctrl->nmask); for_each_node_state(node, N_MEMORY) reset_nodeinfo(scanctrl->nodeinfo[node]); =20 @@ -547,9 +551,11 @@ static int get_target_node(struct kscand_scanctrl *sca= nctrl) int node, target_node =3D NUMA_NO_NODE; unsigned long prev =3D 0; =20 + nodes_clear(scanctrl->nmask); for_each_node(node) { if (node_is_toptier(node) && scanctrl->nodeinfo[node]) { /* This creates a fallback migration node list */ + node_set(node, scanctrl->nmask); if (get_nodeinfo_nr_accessed(scanctrl->nodeinfo[node]) > prev) { prev =3D get_nodeinfo_nr_accessed(scanctrl->nodeinfo[node]); target_node =3D node; @@ -1396,6 +1402,9 @@ static unsigned long kscand_scan_mm_slot(void) =20 total =3D get_slowtier_accesed(&kscand_scanctrl); target_node =3D get_target_node(&kscand_scanctrl); + if (kmigrated_mm_slot) + nodes_copy(kmigrated_mm_slot->migration_nmask, + kscand_scanctrl.nmask); =20 mm_target_node =3D READ_ONCE(mm->target_node); =20 --=20 2.34.1