[merged mm-stable] sched-numa-mm-do-not-try-to-migrate-memory-to-memoryless-nodes.patch removed from -mm tree

[merged mm-stable] sched-numa-mm-do-not-try-to-migrate-memory-to-memoryless-nodes.patch removed from -mm tree

[Andrew Morton]

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@sk.com>
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@sk.com
Link: https://lkml.kernel.org/r/20240216111502.79759-1-byungchul@sk.com
Fixes: c574bbe91703 ("NUMA balancing: optimize page placement for memory tiering system")
Signed-off-by: Byungchul Park <byungchul@sk.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Phil Auld <pauld@redhat.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Benjamin Segall <bsegall@google.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@sk.com are

mm-vmscan-retry-kswapds-priority-loop-with-cache_trim_mode-off-on-failure.patch