linux-kernel - Re: [PATCH 1/2] mm: memcg: fix memcg file

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Date:   Mon, 28 Dec 2020 11:40:50 -0800
From:   Roman Gushchin <guro@...com>
To:     Shakeel Butt <shakeelb@...gle.com>
CC:     Muchun Song <songmuchun@...edance.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm: memcg: fix memcg file_dirty numa stat

On Sun, Dec 27, 2020 at 10:13:09AM -0800, Shakeel Butt wrote:
> The kernel updates the per-node NR_FILE_DIRTY stats on page migration
> but not the memcg numa stats. That was not an issue until recently the
> commit 5f9a4f4a7096 ("mm: memcontrol: add the missing numa_stat interface
> for cgroup v2") exposed numa stats for the memcg. So fixing the
> file_dirty per-memcg numa stat.
> 
> Fixes: 5f9a4f4a7096 ("mm: memcontrol: add the missing numa_stat interface for cgroup v2")
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> Cc: <stable@...r.kernel.org>

Reviewed-by: Roman Gushchin <guro@...com>

Thanks!

> ---
>  mm/migrate.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/migrate.c b/mm/migrate.c
> index ee5e612b4cd8..613794f6a433 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -500,9 +500,9 @@ int migrate_page_move_mapping(struct address_space *mapping,
>  			__inc_lruvec_state(new_lruvec, NR_SHMEM);
>  		}
>  		if (dirty && mapping_can_writeback(mapping)) {
> -			__dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY);
> +			__dec_lruvec_state(old_lruvec, NR_FILE_DIRTY);
>  			__dec_zone_state(oldzone, NR_ZONE_WRITE_PENDING);
> -			__inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY);
> +			__inc_lruvec_state(new_lruvec, NR_FILE_DIRTY);
>  			__inc_zone_state(newzone, NR_ZONE_WRITE_PENDING);
>  		}
>  	}
> -- 
> 2.29.2.729.g45daf8777d-goog
>