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From:   Shakeel Butt <shakeelb@google.com>
Date:   Tue, 23 Feb 2021 08:39:51 -0800
Message-ID: <CALvZod73d_ECo+OVW9NMbnCe5g2iYxL6jCQaSTktvR-=z6vdgQ@mail.gmail.com>
Subject: Re: [PATCH v2] memcg: charge before adding to swapcache on swapin
To:     Hugh Dickins <hughd@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>
Cc:     Roman Gushchin <guro@fb.com>, Michal Hocko <mhocko@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Cgroups <cgroups@vger.kernel.org>, Linux MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>
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On Mon, Feb 22, 2021 at 9:55 PM Shakeel Butt <shakeelb@google.com> wrote:
[snip]
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -596,6 +596,9 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
>  }
>
>  int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask);
> +int mem_cgroup_charge_swapin_page(struct page *page, struct mm_struct *mm,
> +                                 gfp_t gfp, swp_entry_t entry);
> +void mem_cgroup_finish_swapin_page(struct page *page, swp_entry_t entry);
>
>  void mem_cgroup_uncharge(struct page *page);
>  void mem_cgroup_uncharge_list(struct list_head *page_list);
> @@ -1141,6 +1144,17 @@ static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
>         return 0;
>  }
>
> +static inline int mem_cgroup_charge_swapin_page(struct page *page,
> +                       struct mm_struct *mm, gfp_t gfp, swp_entry_t entry);

I didn't build-test the !CONFIG_MEMCG config and missed this
semicolon. Andrew, let me know if you want me to send a new version.

> +{
> +       return 0;
> +}
> +