linux-kernel - Re: [PATCH v3 11/19] mm: memcg/slab: move memcg_kmem

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Date:   Mon, 25 May 2020 19:03:12 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Roman Gushchin <guro@...com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        kernel-team@...com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 11/19] mm: memcg/slab: move memcg_kmem_bypass() to
 memcontrol.h

On 4/22/20 10:47 PM, Roman Gushchin wrote:
> To make the memcg_kmem_bypass() function available outside of
> the memcontrol.c, let's move it to memcontrol.h. The function
> is small and nicely fits into static inline sort of functions.
> 
> It will be used from the slab code.
> 
> Signed-off-by: Roman Gushchin <guro@...com>

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

> ---
>  include/linux/memcontrol.h | 7 +++++++
>  mm/memcontrol.c            | 7 -------
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 44b7d1244620..840eb8d486a8 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1462,6 +1462,13 @@ static inline bool memcg_kmem_enabled(void)
>  	return static_branch_unlikely(&memcg_kmem_enabled_key);
>  }
>  
> +static inline bool memcg_kmem_bypass(void)
> +{
> +	if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD))
> +		return true;
> +	return false;
> +}
> +
>  static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
>  					 int order)
>  {
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index f957b029a62f..06a5929f4872 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2941,13 +2941,6 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
>  	queue_work(memcg_kmem_cache_wq, &cw->work);
>  }
>  
> -static inline bool memcg_kmem_bypass(void)
> -{
> -	if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD))
> -		return true;
> -	return false;
> -}
> -
>  /**
>   * memcg_kmem_get_cache: select the correct per-memcg cache for allocation
>   * @cachep: the original global kmem cache
>