+ mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/vmscan: make sure wakeup_kswapd with managed zone
has been added to the -mm tree.  Its filename is
     mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone.patch

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------------------------------------------------------
From: Wei Yang <richard.weiyang@gmail.com>
Subject: mm/vmscan: make sure wakeup_kswapd with managed zone

wakeup_kswapd() only wake up kswapd when the zone is managed.

For two callers of wakeup_kswapd(), they are node perspective.

  * wake_all_kswapds
  * numamigrate_isolate_page

If we picked up a !managed zone, this is not we expected.

This patch makes sure we pick up a managed zone for wakeup_kswapd().

Link: https://lkml.kernel.org/r/20220327024101.10378-2-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/migrate.c    |    2 +-
 mm/page_alloc.c |    2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/mm/migrate.c~mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone
+++ a/mm/migrate.c
@@ -2046,7 +2046,7 @@ static int numamigrate_isolate_page(pg_d
 		if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING))
 			return 0;
 		for (z = pgdat->nr_zones - 1; z >= 0; z--) {
-			if (populated_zone(pgdat->node_zones + z))
+			if (managed_zone(pgdat->node_zones + z))
 				break;
 		}
 		wakeup_kswapd(pgdat->node_zones + z, 0, order, ZONE_MOVABLE);
--- a/mm/page_alloc.c~mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone
+++ a/mm/page_alloc.c
@@ -4674,6 +4674,8 @@ static void wake_all_kswapds(unsigned in
 
 	for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, highest_zoneidx,
 					ac->nodemask) {
+		if (!managed_zone(zone))
+			continue;
 		if (last_pgdat != zone->zone_pgdat) {
 			wakeup_kswapd(zone, gfp_mask, order, highest_zoneidx);
 			last_pgdat = zone->zone_pgdat;
_

Patches currently in -mm which might be from richard.weiyang@gmail.com are

mm-page_alloc-add-same-penalty-is-enough-to-get-round-robin-order.patch
mm-page_alloc-add-penalty-to-local_node.patch
mm-vmscan-reclaim-only-affects-managed_zones.patch
mm-vmscan-make-sure-wakeup_kswapd-with-managed-zone.patch