Patch "mm: memcg: move vmstats structs definition above flushing code" has been added to the 6.6-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    mm: memcg: move vmstats structs definition above flushing code

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-memcg-move-vmstats-structs-definition-above-flushing-code.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From leon.huangfu@shopee.com Mon Nov  3 08:53:23 2025
From: Leon Huang Fu <leon.huangfu@shopee.com>
Date: Mon,  3 Nov 2025 15:51:32 +0800
Subject: mm: memcg: move vmstats structs definition above flushing code
To: stable@vger.kernel.org, greg@kroah.com
Cc: tj@kernel.org, lizefan.x@bytedance.com, hannes@cmpxchg.org, corbet@lwn.net, mhocko@kernel.org, roman.gushchin@linux.dev, shakeelb@google.com, muchun.song@linux.dev, akpm@linux-foundation.org, sjenning@redhat.com, ddstreet@ieee.org, vitaly.wool@konsulko.com, lance.yang@linux.dev, leon.huangfu@shopee.com, shy828301@gmail.com, yosryahmed@google.com, sashal@kernel.org, vishal.moola@gmail.com, cerasuolodomenico@gmail.com, nphamcs@gmail.com, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Chris Li <chrisl@kernel.org>, Greg Thelen <gthelen@google.com>, Ivan Babrou <ivan@cloudflare.com>, Michal Koutny <mkoutny@suse.com>, Waiman Long <longman@redhat.com>, Wei Xu <weixugc@google.com>
Message-ID: <20251103075135.20254-5-leon.huangfu@shopee.com>

From: Yosry Ahmed <yosryahmed@google.com>

[ Upstream commit e0bf1dc859fdd08ef738824710770a30a8069433 ]

The following patch will make use of those structs in the flushing code,
so move their definitions (and a few other dependencies) a little bit up
to reduce the diff noise in the following patch.

No functional change intended.

Link: https://lkml.kernel.org/r/20231129032154.3710765-3-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Tested-by: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: Ivan Babrou <ivan@cloudflare.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Koutny <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Wei Xu <weixugc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Leon Huang Fu <leon.huangfu@shopee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 mm/memcontrol.c |  148 ++++++++++++++++++++++++++++----------------------------
 1 file changed, 74 insertions(+), 74 deletions(-)

--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -570,6 +570,80 @@ mem_cgroup_largest_soft_limit_node(struc
 	return mz;
 }
 
+/* Subset of vm_event_item to report for memcg event stats */
+static const unsigned int memcg_vm_event_stat[] = {
+	PGPGIN,
+	PGPGOUT,
+	PGSCAN_KSWAPD,
+	PGSCAN_DIRECT,
+	PGSCAN_KHUGEPAGED,
+	PGSTEAL_KSWAPD,
+	PGSTEAL_DIRECT,
+	PGSTEAL_KHUGEPAGED,
+	PGFAULT,
+	PGMAJFAULT,
+	PGREFILL,
+	PGACTIVATE,
+	PGDEACTIVATE,
+	PGLAZYFREE,
+	PGLAZYFREED,
+#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
+	ZSWPIN,
+	ZSWPOUT,
+	ZSWPWB,
+#endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+	THP_FAULT_ALLOC,
+	THP_COLLAPSE_ALLOC,
+	THP_SWPOUT,
+	THP_SWPOUT_FALLBACK,
+#endif
+};
+
+#define NR_MEMCG_EVENTS ARRAY_SIZE(memcg_vm_event_stat)
+static int mem_cgroup_events_index[NR_VM_EVENT_ITEMS] __read_mostly;
+
+static void init_memcg_events(void)
+{
+	int i;
+
+	for (i = 0; i < NR_MEMCG_EVENTS; ++i)
+		mem_cgroup_events_index[memcg_vm_event_stat[i]] = i + 1;
+}
+
+static inline int memcg_events_index(enum vm_event_item idx)
+{
+	return mem_cgroup_events_index[idx] - 1;
+}
+
+struct memcg_vmstats_percpu {
+	/* Local (CPU and cgroup) page state & events */
+	long			state[MEMCG_NR_STAT];
+	unsigned long		events[NR_MEMCG_EVENTS];
+
+	/* Delta calculation for lockless upward propagation */
+	long			state_prev[MEMCG_NR_STAT];
+	unsigned long		events_prev[NR_MEMCG_EVENTS];
+
+	/* Cgroup1: threshold notifications & softlimit tree updates */
+	unsigned long		nr_page_events;
+	unsigned long		targets[MEM_CGROUP_NTARGETS];
+};
+
+struct memcg_vmstats {
+	/* Aggregated (CPU and subtree) page state & events */
+	long			state[MEMCG_NR_STAT];
+	unsigned long		events[NR_MEMCG_EVENTS];
+
+	/* Non-hierarchical (CPU aggregated) page state & events */
+	long			state_local[MEMCG_NR_STAT];
+	unsigned long		events_local[NR_MEMCG_EVENTS];
+
+	/* Pending child counts during tree propagation */
+	long			state_pending[MEMCG_NR_STAT];
+	unsigned long		events_pending[NR_MEMCG_EVENTS];
+};
+
 /*
  * memcg and lruvec stats flushing
  *
@@ -681,80 +755,6 @@ static void flush_memcg_stats_dwork(stru
 	queue_delayed_work(system_unbound_wq, &stats_flush_dwork, FLUSH_TIME);
 }
 
-/* Subset of vm_event_item to report for memcg event stats */
-static const unsigned int memcg_vm_event_stat[] = {
-	PGPGIN,
-	PGPGOUT,
-	PGSCAN_KSWAPD,
-	PGSCAN_DIRECT,
-	PGSCAN_KHUGEPAGED,
-	PGSTEAL_KSWAPD,
-	PGSTEAL_DIRECT,
-	PGSTEAL_KHUGEPAGED,
-	PGFAULT,
-	PGMAJFAULT,
-	PGREFILL,
-	PGACTIVATE,
-	PGDEACTIVATE,
-	PGLAZYFREE,
-	PGLAZYFREED,
-#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
-	ZSWPIN,
-	ZSWPOUT,
-	ZSWPWB,
-#endif
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	THP_FAULT_ALLOC,
-	THP_COLLAPSE_ALLOC,
-	THP_SWPOUT,
-	THP_SWPOUT_FALLBACK,
-#endif
-};
-
-#define NR_MEMCG_EVENTS ARRAY_SIZE(memcg_vm_event_stat)
-static int mem_cgroup_events_index[NR_VM_EVENT_ITEMS] __read_mostly;
-
-static void init_memcg_events(void)
-{
-	int i;
-
-	for (i = 0; i < NR_MEMCG_EVENTS; ++i)
-		mem_cgroup_events_index[memcg_vm_event_stat[i]] = i + 1;
-}
-
-static inline int memcg_events_index(enum vm_event_item idx)
-{
-	return mem_cgroup_events_index[idx] - 1;
-}
-
-struct memcg_vmstats_percpu {
-	/* Local (CPU and cgroup) page state & events */
-	long			state[MEMCG_NR_STAT];
-	unsigned long		events[NR_MEMCG_EVENTS];
-
-	/* Delta calculation for lockless upward propagation */
-	long			state_prev[MEMCG_NR_STAT];
-	unsigned long		events_prev[NR_MEMCG_EVENTS];
-
-	/* Cgroup1: threshold notifications & softlimit tree updates */
-	unsigned long		nr_page_events;
-	unsigned long		targets[MEM_CGROUP_NTARGETS];
-};
-
-struct memcg_vmstats {
-	/* Aggregated (CPU and subtree) page state & events */
-	long			state[MEMCG_NR_STAT];
-	unsigned long		events[NR_MEMCG_EVENTS];
-
-	/* Non-hierarchical (CPU aggregated) page state & events */
-	long			state_local[MEMCG_NR_STAT];
-	unsigned long		events_local[NR_MEMCG_EVENTS];
-
-	/* Pending child counts during tree propagation */
-	long			state_pending[MEMCG_NR_STAT];
-	unsigned long		events_pending[NR_MEMCG_EVENTS];
-};
-
 unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
 {
 	long x = READ_ONCE(memcg->vmstats->state[idx]);


Patches currently in stable-queue which might be from leon.huangfu@shopee.com are

queue-6.6/mm-memcg-make-stats-flushing-threshold-per-memcg.patch
queue-6.6/mm-memcg-change-flush_next_time-to-flush_last_time.patch
queue-6.6/mm-memcg-restore-subtree-stats-flushing.patch
queue-6.6/mm-workingset-move-the-stats-flush-into-workingset_test_recent.patch
queue-6.6/mm-memcg-add-thp-swap-out-info-for-anonymous-reclaim.patch
queue-6.6/mm-memcg-add-per-memcg-zswap-writeback-stat.patch
queue-6.6/mm-memcg-move-vmstats-structs-definition-above-flushing-code.patch