linux-kernel - Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge

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Message-ID: <YQjv+DzdX3CuVfIo@dhcp22.suse.cz>
Date:   Tue, 3 Aug 2021 09:27:52 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Roman Gushchin <guro@...com>
Cc:     Miaohe Lin <linmiaohe@...wei.com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "vdavydov.dev@...il.com" <vdavydov.dev@...il.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "shakeelb@...gle.com" <shakeelb@...gle.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "alexs@...nel.org" <alexs@...nel.org>,
        "richard.weiyang@...il.com" <richard.weiyang@...il.com>,
        "songmuchun@...edance.com" <songmuchun@...edance.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>
Subject: Re: [PATCH 2/5] mm, memcg: narrow the scope of percpu_charge_mutex

On Tue 03-08-21 07:13:35, Roman Gushchin wrote:
> I’d go with atomic_dec().

which is not implying memory barriers either. You would need
atomic_dec_return or some other explicit barrier IIRC.
-- 
Michal Hocko
SUSE Labs