The quilt patch titled
Subject: sched/numa, mm: do not try to migrate memory to memoryless nodes
has been removed from the -mm tree. Its filename was
sched-numa-mm-do-not-try-to-migrate-memory-to-memoryless-nodes.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Byungchul Park <byungchul@xxxxxx>
Subject: sched/numa, mm: do not try to migrate memory to memoryless nodes
Date: Mon, 19 Feb 2024 13:10:47 +0900
Memoryless nodes do not have any memory to migrate to, so, as an
optimization, stop trying it.
Link: https://lkml.kernel.org/r/20240219041920.1183-1-byungchul@xxxxxx
Link: https://lkml.kernel.org/r/20240216111502.79759-1-byungchul@xxxxxx
Fixes: c574bbe91703 ("NUMA balancing: optimize page placement for memory tiering system")
Signed-off-by: Byungchul Park <byungchul@xxxxxx>
Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Reviewed-by: Phil Auld <pauld@xxxxxxxxxx>
Reviewed-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Benjamin Segall <bsegall@xxxxxxxxxx>
Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Valentin Schneider <vschneid@xxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sched/fair.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/kernel/sched/fair.c~sched-numa-mm-do-not-try-to-migrate-memory-to-memoryless-nodes
+++ a/kernel/sched/fair.c
@@ -1831,6 +1831,12 @@ bool should_numa_migrate_memory(struct t
int last_cpupid, this_cpupid;
/*
+ * Cannot migrate to memoryless nodes.
+ */
+ if (!node_state(dst_nid, N_MEMORY))
+ return false;
+
+ /*
* The pages in slow memory node should be migrated according
* to hot/cold instead of private/shared.
*/
_
Patches currently in -mm which might be from byungchul@xxxxxx are
mm-vmscan-retry-kswapds-priority-loop-with-cache_trim_mode-off-on-failure.patch
