linux-kernel - [PATCH 0/7] memcg: make memcg stats irq safe

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Message-ID: <20250514050813.2526843-1-shakeel.butt@linux.dev>
Date: Tue, 13 May 2025 22:08:06 -0700
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>,
	Vlastimil Babka <vbabka@...e.cz>,
	Alexei Starovoitov <ast@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Harry Yoo <harry.yoo@...cle.com>,
	Yosry Ahmed <yosry.ahmed@...ux.dev>,
	bpf@...r.kernel.org,
	linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>
Subject: [PATCH 0/7] memcg: make memcg stats irq safe

This series converts memcg stats to be irq safe i.e. memcg stats can be
updated in any context (task, softirq or hardirq) without disabling the
irqs. This is still not nmi-safe on all architectures but after this
series converting memcg charging and stats nmi-safe will be easier.


Changes since RFC[1]:
--------------------
1. Rebased on next-20250513 (mm tree has some conflicts with cgroup
   tree).
2. Does not depend of nmi-safe memcg series [2].
3. Made memcg_rstat_updated re-entrant using this_cpu_* ops as suggested
   by Vlastimil.
4. Fixes some spelling mistakes as suggested by Vlastimil.
5. Rearranged the 6th and 7th patch as suggested by Vlastimil.

Link: http://lore.kernel.org/20250513031316.2147548-1-shakeel.butt@linux.dev [1]
Link: http://lore.kernel.org/20250509232859.657525-1-shakeel.butt@linux.dev [2]

Shakeel Butt (7):
  memcg: memcg_rstat_updated re-entrant safe against irqs
  memcg: move preempt disable to callers of memcg_rstat_updated
  memcg: make mod_memcg_state re-entrant safe against irqs
  memcg: make count_memcg_events re-entrant safe against irqs
  memcg: make __mod_memcg_lruvec_state re-entrant safe against irqs
  memcg: no stock lock for cpu hot-unplug
  memcg: objcg stock trylock without irq disabling

 include/linux/memcontrol.h |  41 +--------
 mm/memcontrol-v1.c         |   6 +-
 mm/memcontrol.c            | 170 +++++++++++++++----------------------
 mm/swap.c                  |   8 +-
 mm/vmscan.c                |  14 +--
 5 files changed, 86 insertions(+), 153 deletions(-)

-- 
2.47.1