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Date: Tue, 25 Aug 2020 09:25:01 +0800 From: Alex Shi <alex.shi@...ux.alibaba.com> To: Michal Hocko <mhocko@...e.com>, Qian Cai <cai@....pw> Cc: akpm@...ux-foundation.org, Johannes Weiner <hannes@...xchg.org>, Vladimir Davydov <vdavydov.dev@...il.com>, cgroups@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, nao.horiguchi@...il.com, osalvador@...e.de, mike.kravetz@...cle.com Subject: Re: [Resend PATCH 1/6] mm/memcg: warning on !memcg after readahead page charged reproduce using our linux-mm random bug collection on NUMA systems. >> >> OK, I must have missed that this was on ppc. The order makes more sense >> now. I will have a look at this next week. > > OK, so I've had a look and I know what's going on there. The > move_pages12 is migrating hugetlb pages. Those are not charged to any > memcg. We have completely missed this case. There are two ways going > around that. Drop the warning and update the comment so that we do not > forget about that or special case hugetlb pages. > > I think the first option is better. > Hi Michal, Compare to ignore the warning which is designed to give, seems addressing the hugetlb out of charge issue is a better solution, otherwise the memcg memory usage is out of control on hugetlb, is that right? Thanks Alex
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