linux-kernel - Re: [PATCH v2 2/9] memcg: rename mem_cgroup_flush_stats

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Date:   Wed, 29 Mar 2023 13:56:04 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Koutný <mkoutny@...e.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2 2/9] memcg: rename mem_cgroup_flush_stats_"delayed" to
 "ratelimited"

On Tue 28-03-23 22:16:37, Yosry Ahmed wrote:
> mem_cgroup_flush_stats_delayed() suggests his is using a delayed_work,
> but this is actually sometimes flushing directly from the callsite.
> 
> What it's doing is ratelimited calls. A better name would be
> mem_cgroup_flush_stats_ratelimited().
> 
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
> Acked-by: Shakeel Butt <shakeelb@...gle.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  include/linux/memcontrol.h | 4 ++--
>  mm/memcontrol.c            | 2 +-
>  mm/workingset.c            | 2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index b6eda2ab205d..ac3f3b3a45e2 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1037,7 +1037,7 @@ static inline unsigned long lruvec_page_state_local(struct lruvec *lruvec,
>  }
>  
>  void mem_cgroup_flush_stats(void);
> -void mem_cgroup_flush_stats_delayed(void);
> +void mem_cgroup_flush_stats_ratelimited(void);
>  
>  void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
>  			      int val);
> @@ -1535,7 +1535,7 @@ static inline void mem_cgroup_flush_stats(void)
>  {
>  }
>  
> -static inline void mem_cgroup_flush_stats_delayed(void)
> +static inline void mem_cgroup_flush_stats_ratelimited(void)
>  {
>  }
>  
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 0205e58ea430..c3b6aae78901 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -653,7 +653,7 @@ void mem_cgroup_flush_stats(void)
>  		__mem_cgroup_flush_stats();
>  }
>  
> -void mem_cgroup_flush_stats_delayed(void)
> +void mem_cgroup_flush_stats_ratelimited(void)
>  {
>  	if (time_after64(jiffies_64, flush_next_time))
>  		mem_cgroup_flush_stats();
> diff --git a/mm/workingset.c b/mm/workingset.c
> index 00c6f4d9d9be..af862c6738c3 100644
> --- a/mm/workingset.c
> +++ b/mm/workingset.c
> @@ -462,7 +462,7 @@ void workingset_refault(struct folio *folio, void *shadow)
>  
>  	mod_lruvec_state(lruvec, WORKINGSET_REFAULT_BASE + file, nr);
>  
> -	mem_cgroup_flush_stats_delayed();
> +	mem_cgroup_flush_stats_ratelimited();
>  	/*
>  	 * Compare the distance to the existing workingset size. We
>  	 * don't activate pages that couldn't stay resident even if
> -- 
> 2.40.0.348.gf938b09366-goog

-- 
Michal Hocko
SUSE Labs