linux-kernel - Re: [PATCH v5 2/4] mm: memcontrol/slab: use helpers to access slab page's memcg

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Message-ID: <CALvZod5uFB0jysrTp6842Shx0rKmZfNfzyN1AzqEkOeAZ4gpWw@mail.gmail.com>
Date:   Mon, 5 Oct 2020 08:13:02 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>, Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v5 2/4] mm: memcontrol/slab: use helpers to access slab
 page's memcg_data

On Fri, Oct 2, 2020 at 10:26 AM Roman Gushchin <guro@...com> wrote:
>
> To gather all direct accesses to struct page's memcg_data field
> in one place, let's introduce 3 new helpers to use in the slab
> accounting code:
>   struct obj_cgroup **page_objcgs(struct page *page);
>   struct obj_cgroup **page_objcgs_check(struct page *page);
>   bool set_page_objcgs(struct page *page, struct obj_cgroup **objcgs);
>
> They are similar to the corresponding API for generic pages, except
> that the setter can return false, indicating that the value has been
> already set from a different thread.
>
> Signed-off-by: Roman Gushchin <guro@...com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>