linux-kernel - [PATCH 0/4] memcg: cleanup the memcg stats interfaces

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Message-ID: <20251110232008.1352063-1-shakeel.butt@linux.dev>
Date: Mon, 10 Nov 2025 15:20:04 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Harry Yoo <harry.yoo@...cle.com>,
	Qi Zheng <qi.zheng@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>,
	linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>
Subject: [PATCH 0/4] memcg: cleanup the memcg stats interfaces

The memcg stats are safe against irq (and nmi) context and thus does not
require disabling irqs. However for some stats which are also maintained
at node level, it is using irq unsafe interface and thus requiring the
users to still disables irqs or use interfaces which explicitly disables
irqs. Let's move memcg code to use irq safe node level stats function
which is already optimized for architectures with HAVE_CMPXCHG_LOCAL
(all major ones), so there will not be any performance penalty for its
usage.

Shakeel Butt (4):
  memcg: use mod_node_page_state to update stats
  memcg: remove __mod_lruvec_kmem_state
  memcg: remove __mod_lruvec_state
  memcg: remove __lruvec_stat_mod_folio

 include/linux/memcontrol.h | 28 ++++------------------
 include/linux/mm_inline.h  |  2 +-
 include/linux/vmstat.h     | 48 ++------------------------------------
 mm/filemap.c               | 20 ++++++++--------
 mm/huge_memory.c           |  4 ++--
 mm/khugepaged.c            |  8 +++----
 mm/memcontrol.c            | 20 ++++++++--------
 mm/migrate.c               | 20 ++++++++--------
 mm/page-writeback.c        |  2 +-
 mm/rmap.c                  |  4 ++--
 mm/shmem.c                 |  6 ++---
 mm/vmscan.c                |  4 ++--
 mm/workingset.c            |  2 +-
 13 files changed, 53 insertions(+), 115 deletions(-)

-- 
2.47.3