linux-kernel - Re: [PATCH] memcg: simple cleanup of stats update functions

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Date: Sat, 20 Apr 2024 09:23:26 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg: simple cleanup of stats update functions

Hi Shakeel,

On Fri, Apr 19, 2024 at 04:39:49PM -0700, Shakeel Butt wrote:
> @@ -2983,10 +2984,6 @@ void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg)
>  
>  #ifdef CONFIG_MEMCG_KMEM
>  
> -/*
> - * mod_objcg_mlstate() may be called with irq enabled, so
> - * mod_memcg_lruvec_state() should be used.
> - */
>  static inline void mod_objcg_mlstate(struct obj_cgroup *objcg,
>  				     struct pglist_data *pgdat,
>  				     enum node_stat_item idx, int nr)
> @@ -2994,10 +2991,12 @@ static inline void mod_objcg_mlstate(struct obj_cgroup *objcg,
>  	struct mem_cgroup *memcg;
>  	struct lruvec *lruvec;
>  
> +	lockdep_assert_irqs_disabled();
> +
>  	rcu_read_lock();
>  	memcg = obj_cgroup_memcg(objcg);
>  	lruvec = mem_cgroup_lruvec(memcg, pgdat);
> -	mod_memcg_lruvec_state(lruvec, idx, nr);
> +	__mod_memcg_lruvec_state(lruvec, idx, nr);
>  	rcu_read_unlock();
>  }

Best to rename it to __mod_objcg_mlstate() as well to follow the
naming pattern for whether caller or callee handles IRQ toggling?

Otherwise, looks great to me!

Acked-by: Johannes Weiner <hannes@...xchg.org>