linux-kernel - Re: [PATCH v20 01/20] mm/memcg: warning on !memcg after readahead page charged

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Message-ID: <20201029134346.GB599825@cmpxchg.org>
Date:   Thu, 29 Oct 2020 09:43:46 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     akpm@...ux-foundation.org, mgorman@...hsingularity.net,
        tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
        daniel.m.jordan@...cle.com, willy@...radead.org, lkp@...el.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, shakeelb@...gle.com,
        iamjoonsoo.kim@....com, richard.weiyang@...il.com,
        kirill@...temov.name, alexander.duyck@...il.com,
        rong.a.chen@...el.com, mhocko@...e.com, vdavydov.dev@...il.com,
        shy828301@...il.com, Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH v20 01/20] mm/memcg: warning on !memcg after readahead
 page charged

On Thu, Oct 29, 2020 at 06:44:46PM +0800, Alex Shi wrote:
> Add VM_WARN_ON_ONCE_PAGE() macro.
> 
> Since readahead page is charged on memcg too, in theory we don't have to
> check this exception now. Before safely remove them all, add a warning
> for the unexpected !memcg.
> 
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Acked-by: Hugh Dickins <hughd@...gle.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vladimir Davydov <vdavydov.dev@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: cgroups@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Johannes Weiner <hannes@...xchg.org>