linux-kernel - Re: [RFC PATCH 3/7] memcg: make mod_memcg

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Message-ID: <3eb24d4c-05ec-4c4c-a181-25a987fe69e5@suse.cz>
Date: Tue, 13 May 2025 12:38:26 +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 3/7] memcg: make mod_memcg_state re-entrant safe
 against irqs

On 5/13/25 05:13, Shakeel Butt wrote:
> Let's make mod_memcg_state re-entrant safe against irqs. The only thing
> needed is to convert the usage of __this_cpu_add() to this_cpu_add().
> In addition, with re-entrant safety, there is no need to disable irqs.
> 
> mod_memcg_state() is not safe against nmi, so let's add warning if
> someone tries to call it in nmi context.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Also a good cleanup.

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