linux-kernel - Re: [RFC 0/4] Introduce unbalance proactive reclaim

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Date:   Tue, 14 Nov 2023 10:56:13 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Huan Yang <link@...o.com>
Cc:     "Huang, Ying" <ying.huang@...el.com>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Peter Xu <peterx@...hat.com>,
        "Vishal Moola (Oracle)" <vishal.moola@...il.com>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Liu Shixin <liushixin2@...wei.com>,
        Hugh Dickins <hughd@...gle.com>, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, opensource.kernel@...o.com
Subject: Re: [RFC 0/4] Introduce unbalance proactive reclaim

On Tue 14-11-23 10:54:05, Michal Hocko wrote:
> On Mon 13-11-23 16:26:00, Huan Yang wrote:
> [...]
> > However, considering that we need to perform proactive reclaim in batches,
> > suppose that only 5% of the use-once page cache in this memcg can be
> > reclaimed,
> > but we need to call proactive memory reclaim step by step, such as 5%, 10%,
> > 15% ... 100%.
> 
> You haven't really explained this and I have asked several times IIRC.
> Why do you even need to do those batches? Why cannot you simply relly on
> the memory pressure triggering the memory reclaim? Do you have any
> actual numbers showing that being pro-active results in smaller
> latencies or anything that would show this is actually needed?

Just noticed dcd2eff8-400b-4ade-a5b2-becfe26b437b@...o.com, will reply
there.

-- 
Michal Hocko
SUSE Labs