linux-kernel - Re: [page-reclaim] [PATCH v7 11/12] mm: multigenerational LRU: debugfs interface

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Date:   Fri, 18 Feb 2022 10:56:44 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Yu Zhao <yuzhao@...gle.com>, Johannes Weiner <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Barry Song <21cnbao@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>, Jens Axboe <axboe@...nel.dk>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michael Larabel <Michael@...haellarabel.com>,
        Mike Rapoport <rppt@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Ying Huang <ying.huang@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        page-reclaim@...gle.com, x86@...nel.org,
        Brian Geffon <bgeffon@...gle.com>,
        Jan Alexander Steffens <heftig@...hlinux.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Steven Barrett <steven@...uorix.net>,
        Suleiman Souhlal <suleiman@...gle.com>,
        Daniel Byrne <djbyrne@....edu>,
        Donald Carr <d@...os-reins.com>,
        Holger Hoffstätte <holger@...lied-asynchrony.com>,
        Konstantin Kharlamov <Hi-Angel@...dex.ru>,
        Shuang Zhai <szhai2@...rochester.edu>,
        Sofia Trinh <sofia.trinh@....works>
Subject: Re: [page-reclaim] [PATCH v7 11/12] mm: multigenerational LRU:
 debugfs interface

On Tue, 8 Feb 2022, Yu Zhao wrote:

> Add /sys/kernel/debug/lru_gen for working set estimation and proactive
> reclaim. These features are required to optimize job scheduling (bin
> packing) in data centers [1][2].
> 

Johannes, do you believe this interface is sufficient to induce memcg 
based reclaim or do you have plans to propose a memory.reclaim extension 
to memcg?

I assume that lru_gen could be used even if memcg is disabled whereas 
memory.reclaim would only be available on systems where the controller is 
mounted through cgroups.

Yet a question would probably arise about the stability of this interface 
since it lives in debugfs: can we plan on /sys/kernel/debug/lru_gen being 
long-term supported?