linux-kernel - Re: [PATCH v7 10/12] mm: multigenerational LRU: thrashing prevention

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Date:   Tue, 8 Feb 2022 01:43:03 -0700
From:   Yu Zhao <yuzhao@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>
Cc:     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: [PATCH v7 10/12] mm: multigenerational LRU: thrashing prevention

On Tue, Feb 08, 2022 at 01:19:00AM -0700, Yu Zhao wrote:
> Add /sys/kernel/mm/lru_gen/min_ttl_ms for thrashing prevention, as
> requested by many desktop users [1].
> 
> When set to value N, it prevents the working set of N milliseconds
> from getting evicted. The OOM killer is triggered if this working set
> can't be kept in memory. Based on the average human detectable lag
> (~100ms), N=1000 usually eliminates intolerable lags due to thrashing.
> Larger values like N=3000 make lags less noticeable at the risk of
> premature OOM kills.

Refactored min_ttl into a separate patch as requested here:
https://lore.kernel.org/linux-mm/YdxSUuDc3OC4pe+f@dhcp22.suse.cz/

<snipped>