linux-kernel - Re: [PATCH v2 1/2] hugetlb: memcg: account hugetlb-backed memory in memory controller (fix)

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Date:   Fri, 29 Sep 2023 11:19:07 -0700
From:   Nhat Pham <nphamcs@...il.com>
To:     akpm@...ux-foundation.org
Cc:     riel@...riel.com, hannes@...xchg.org, mhocko@...nel.org,
        roman.gushchin@...ux.dev, shakeelb@...gle.com,
        muchun.song@...ux.dev, tj@...nel.org, lizefan.x@...edance.com,
        shuah@...nel.org, mike.kravetz@...cle.com, yosryahmed@...gle.com,
        fvdl@...gle.com, linux-mm@...ck.org, kernel-team@...a.com,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH v2 1/2] hugetlb: memcg: account hugetlb-backed memory in
 memory controller (fix)

On Fri, Sep 29, 2023 at 11:17 AM Nhat Pham <nphamcs@...il.com> wrote:
>
> This fixlet disables the hugetlb memcg accounting behavior in cgroup v1.
>
Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Nhat Pham <nphamcs@...il.com>
> ---
>  mm/memcontrol.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index d5dfc9b36acb..de6bd8ca87f5 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -7081,6 +7081,7 @@ int mem_cgroup_hugetlb_charge_folio(struct folio *folio, gfp_t gfp)
>         int ret;
>
>         if (mem_cgroup_disabled() ||
> +               !cgroup_subsys_on_dfl(memory_cgrp_subsys) ||
>                 !(cgrp_dfl_root.flags & CGRP_ROOT_MEMORY_HUGETLB_ACCOUNTING))
>                 return 0;
>
> --
> 2.34.1