linux-kernel - Re: [PATCH v18 00/32] per memcg lru

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Message-ID: <327a1bb4-b64d-65b8-e18f-db33e03ca9ed@linux.alibaba.com>
Date:   Fri, 28 Aug 2020 13:22:28 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        mgorman@...hsingularity.net, tj@...nel.org,
        khlebnikov@...dex-team.ru, willy@...radead.org, hannes@...xchg.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
Subject: Re: [PATCH v18 00/32] per memcg lru_lock


在 2020/8/28 上午9:40, Daniel Jordan 写道:
> I went back to your v1 post to see what motivated you originally, and you had
> some results from aim9 but nothing about where this reared its head in the
> first place.  How did you discover the bottleneck?  I'm just curious about how
> lru_lock hurts in practice.

We have gotten very high 'sys' in some buiness/machines. And found much of time spent
on the lru_lock and/or zone lock. Seems per memcg lru_lock could help this, but still
no idea on zone lock.

Thanks
Alex