linux-kernel - Re: [External] [PATCH] mm/page_alloc: simplify kmem cgroup charge/uncharge code

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Date:   Mon, 7 Dec 2020 22:42:23 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Hui Su <sh_def@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [External] [PATCH] mm/page_alloc: simplify kmem cgroup
 charge/uncharge code

On Mon, Dec 7, 2020 at 10:22 PM Hui Su <sh_def@....com> wrote:
>
> Since the commit 60cd4bcd6238 ("memcg: localize memcg_kmem_enabled()
> check"), we have supplied the api which users don't have to explicitly
> check memcg_kmem_enabled().
>
> Signed-off-by: Hui Su <sh_def@....com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>

> ---
>  mm/page_alloc.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index eaa227a479e4..dc990a899ded 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1214,8 +1214,8 @@ static __always_inline bool free_pages_prepare(struct page *page,
>                  * Do not let hwpoison pages hit pcplists/buddy
>                  * Untie memcg state and reset page's owner
>                  */
> -               if (memcg_kmem_enabled() && PageKmemcg(page))
> -                       __memcg_kmem_uncharge_page(page, order);
> +               if (PageKmemcg(page))
> +                       memcg_kmem_uncharge_page(page, order);
>                 reset_page_owner(page, order);
>                 return false;
>         }
> @@ -1244,8 +1244,8 @@ static __always_inline bool free_pages_prepare(struct page *page,
>         }
>         if (PageMappingFlags(page))
>                 page->mapping = NULL;
> -       if (memcg_kmem_enabled() && PageKmemcg(page))
> -               __memcg_kmem_uncharge_page(page, order);
> +       if (PageKmemcg(page))
> +               memcg_kmem_uncharge_page(page, order);
>         if (check_free)
>                 bad += check_free_page(page);
>         if (bad)
> @@ -4965,8 +4965,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
>         page = __alloc_pages_slowpath(alloc_mask, order, &ac);
>
>  out:
> -       if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page &&
> -           unlikely(__memcg_kmem_charge_page(page, gfp_mask, order) != 0)) {
> +       if ((gfp_mask & __GFP_ACCOUNT) && page &&
> +           unlikely(memcg_kmem_charge_page(page, gfp_mask, order) != 0)) {
>                 __free_pages(page, order);
>                 page = NULL;
>         }
> --
> 2.29.2
>
>


-- 
Yours,
Muchun