[to-be-updated] mm-memcg-v1-fix-memorymemswfailcnt-accounting.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm: memcg-v1: fix memory.memsw.failcnt accounting
has been removed from the -mm tree.  Its filename was
     mm-memcg-v1-fix-memorymemswfailcnt-accounting.patch

This patch was dropped because an updated version will be issued

------------------------------------------------------
From: Guopeng Zhang <zhangguopeng@kylinos.cn>
Subject: mm: memcg-v1: fix memory.memsw.failcnt accounting
Date: Mon, 10 Aug 2026 15:42:47 +0800

Commit 0e2759afcaf9 ("page_counter: track failcnt only for legacy
cgroups") made failcnt accounting conditional on track_failcnt.  It
enabled the flag for memcg->memory, but not for memcg->memsw.

Consequently, memory.memsw.failcnt remains zero when the memory+swap limit
is hit.  Enable failcnt accounting for the v1 memsw counter.

Reproducer:

    CG=/sys/fs/cgroup/memory/memsw-test
    LIMIT=33554432
    mkdir "$CG"
    echo "$LIMIT" > "$CG/memory.limit_in_bytes"
    echo "$LIMIT" > "$CG/memory.memsw.limit_in_bytes"

Start a child process in the cgroup and make it allocate and touch 96 MiB
of memory, causing a memcg OOM.

    cat "$CG/memory.memsw.failcnt"

Without the patch, memory.memsw.failcnt is 0.  With the patch,
memory.memsw.failcnt is greater than 0.

Link: https://lore.kernel.org/20260810074247.52747-1-guopeng.zhang@linux.dev
Fixes: 0e2759afcaf9 ("page_counter: track failcnt only for legacy cgroups")
Signed-off-by: Guopeng Zhang <zhangguopeng@kylinos.cn>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |    1 +
 1 file changed, 1 insertion(+)

--- a/mm/memcontrol.c~mm-memcg-v1-fix-memorymemswfailcnt-accounting
+++ a/mm/memcontrol.c
@@ -4180,6 +4180,7 @@ mem_cgroup_css_alloc(struct cgroup_subsy
 		page_counter_init(&memcg->swap, &parent->swap, false);
 #ifdef CONFIG_MEMCG_V1
 		memcg->memory.track_failcnt = !memcg_on_dfl;
+		memcg->memsw.track_failcnt = !memcg_on_dfl;
 		WRITE_ONCE(memcg->oom_kill_disable, READ_ONCE(parent->oom_kill_disable));
 		page_counter_init(&memcg->kmem, &parent->kmem, false);
 		page_counter_init(&memcg->tcpmem, &parent->tcpmem, false);
_

Patches currently in -mm which might be from zhangguopeng@kylinos.cn are

mm-memcg-v1-fix-memsw-and-tcp-failcnt-accounting.patch
mm-memcg-stop-reclaim-when-a-limit-update-is-superseded.patch