linux-kernel - Re: [RFC PATCH 5/7] memcg: make __mod_memcg_lruvec

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Message-ID: <d015a0b1-498f-4b7b-97db-27c4d92e884d@suse.cz>
Date: Tue, 13 May 2025 12:40:00 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Shakeel Butt <shakeel.butt@...ux.dev>,
 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>, 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: Re: [RFC PATCH 5/7] memcg: make __mod_memcg_lruvec_state re-entrant
 safe against irqs

On 5/13/25 05:13, Shakeel Butt wrote:
> Let's make __mod_memcg_lruvec_state re-entrant safe and name it
> mod_memcg_lruvec_state(). The only thing needed is to convert the usage
> of __this_cpu_add() to this_cpu_add(). There are two callers of
> mod_memcg_lruvec_state() and one of them i.e. __mod_objcg_mlstate() will
> be re-entrant safe as well, so, rename it mod_objcg_mlstate(). The last
> caller __mod_lruvec_state() still calls __mod_node_page_state() which is
> not re-entrant safe yet, so keep it as is.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Acked-by: Vlastimil Babka <vbabka@...e.cz>