[merged mm-stable] mm-page_alloc-fix-deferred-compaction-accounting.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm/page_alloc: fix deferred compaction accounting
has been removed from the -mm tree.  Its filename was
     mm-page_alloc-fix-deferred-compaction-accounting.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: fujunjie <fujunjie1@qq.com>
Subject: mm/page_alloc: fix deferred compaction accounting
Date: Tue, 26 May 2026 09:12:48 +0000

COMPACT_DEFERRED means compaction did not start because past failures
caused the zone to be deferred.  try_to_compact_pages() returns the
maximum result seen while walking the zonelist, so a final
COMPACT_DEFERRED result means no later zone reported that compaction
actually ran.

__alloc_pages_direct_compact() skips COMPACTSTALL and COMPACTFAIL
accounting when try_to_compact_pages() returns COMPACT_SKIPPED, but not
when it returns COMPACT_DEFERRED.  A deferred-only direct compaction
attempt can therefore look like a stall, and then a failure if the
allocation still cannot be satisfied.

Treat COMPACT_DEFERRED like COMPACT_SKIPPED in this accounting path.  If a
later zone runs compaction and returns a result above COMPACT_DEFERRED, or
compact_zone_order() reports COMPACT_SUCCESS for a captured page, the
final result is not COMPACT_DEFERRED and the existing accounting still
runs.

Link: https://lore.kernel.org/tencent_368AF1F3821E46232637BE16D65C45CF3308@qq.com
Fixes: 06dac2f467fe ("mm: compaction: update the COMPACT[STALL|FAIL] events properly")
Signed-off-by: fujunjie <fujunjie1@qq.com>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

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

--- a/mm/page_alloc.c~mm-page_alloc-fix-deferred-compaction-accounting
+++ a/mm/page_alloc.c
@@ -4161,7 +4161,8 @@ __alloc_pages_direct_compact(gfp_t gfp_m
 	psi_memstall_leave(&pflags);
 	delayacct_compact_end();
 
-	if (*compact_result == COMPACT_SKIPPED)
+	if (*compact_result == COMPACT_SKIPPED ||
+	    *compact_result == COMPACT_DEFERRED)
 		return NULL;
 	/*
 	 * At least in one zone compaction wasn't deferred or skipped, so let's
_

Patches currently in -mm which might be from fujunjie1@qq.com are