linux-kernel - [PATCH 0/4] memcg: decouple memcg and objcg stocks

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Message-ID: <20250429230428.1935619-1-shakeel.butt@linux.dev>
Date: Tue, 29 Apr 2025 16:04:24 -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>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	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: decouple memcg and objcg stocks

The per-cpu memcg charge cache and objcg charge cache are coupled in a
single struct memcg_stock_pcp and a single local lock is used to protect
both of the caches. This makes memcg charging and objcg charging nmi
safe challenging. Decoupling memcg and objcg stocks would allow us to
make them nmi safe and even work without disabling irqs independently.
This series completely decouples memcg and objcg stocks.

Shakeel Butt (4):
  memcg: simplify consume_stock
  memcg: separate local_trylock for memcg and obj
  memcg: completely decouple memcg and obj stocks
  memcg: no irq disable for memcg stock lock

 mm/memcontrol.c | 174 ++++++++++++++++++++++++++++--------------------
 1 file changed, 102 insertions(+), 72 deletions(-)

-- 
2.47.1