linux-kernel - Re: [PATCH 03/14] lru/memcg: using per lruvec lock in un/lock_page

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Message-ID: <bd44a613-d820-6085-0145-657078fd79cc@linux.alibaba.com>
Date:   Mon, 26 Aug 2019 22:16:58 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 03/14] lru/memcg: using per lruvec lock in
 un/lock_page_lru



在 2019/8/26 下午4:30, Konstantin Khlebnikov 写道:
>>
>>   
> 
> What protects lruvec from freeing at this point?
> After reading resolving lruvec page could be moved and cgroup deleted.
> 
> In this old patches I've used RCU for that: https://lkml.org/lkml/2012/2/20/276
> Pointer to lruvec should be resolved under disabled irq.
> Not sure this works these days.

Thanks for reminder! I will reconsider this point and come up with changes.

Thanks
Alex