linux-kernel - Re: [PATCH 01/18] mm: fix NUMA node file count error in replace_page

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Date:   Tue, 21 Apr 2020 12:13:34 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Joonsoo Kim <js1304@...il.com>,
        Alex Shi <alex.shi@...ux.alibaba.com>,
        Hugh Dickins <hughd@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Roman Gushchin <guro@...com>, Linux MM <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH 01/18] mm: fix NUMA node file count error in replace_page_cache()

On Mon, Apr 20, 2020 at 3:11 PM Johannes Weiner <hannes@...xchg.org> wrote:
>
> When replacing one page with another one in the cache, we have to
> decrease the file count of the old page's NUMA node and increase the
> one of the new NUMA node, otherwise the old node leaks the count and
> the new node eventually underflows its counter.
>
> Fixes: 74d609585d8b ("page cache: Add and replace pages using the XArray")
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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