linux-kernel - Re: [PATCH v4 1/5] mm/memcg: Move mod_objcg

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Message-ID: <YH2eT+JCII48hX80@cmpxchg.org>
Date:   Mon, 19 Apr 2021 11:14:23 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Alex Shi <alex.shi@...ux.alibaba.com>,
        Chris Down <chris@...isdown.name>,
        Yafang Shao <laoar.shao@...il.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Masayoshi Mizuma <msys.mizuma@...il.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v4 1/5] mm/memcg: Move mod_objcg_state() to memcontrol.c

On Sun, Apr 18, 2021 at 08:00:28PM -0400, Waiman Long wrote:
> The mod_objcg_state() function is moved from mm/slab.h to mm/memcontrol.c
> so that further optimization can be done to it in later patches without
> exposing unnecessary details to other mm components.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>
> ---
>  mm/memcontrol.c | 13 +++++++++++++
>  mm/slab.h       | 16 ++--------------
>  2 files changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e064ac0d850a..dc9032f28f2e 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3150,6 +3150,19 @@ void __memcg_kmem_uncharge_page(struct page *page, int order)
>  	css_put(&memcg->css);
>  }
>  
> +void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
> +		     enum node_stat_item idx, int nr)
> +{
> +	struct mem_cgroup *memcg;
> +	struct lruvec *lruvec = NULL;
> +
> +	rcu_read_lock();
> +	memcg = obj_cgroup_memcg(objcg);
> +	lruvec = mem_cgroup_lruvec(memcg, pgdat);
> +	mod_memcg_lruvec_state(lruvec, idx, nr);
> +	rcu_read_unlock();
> +}

It would be more naturally placed next to the others, e.g. below
__mod_lruvec_kmem_state().

But no deal breaker if there isn't another revision.

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