linux-kernel - Re: [PATCH v1 09/14] mm: multigenerational lru: mm

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Message-ID: <048e5e1e977e720c3f9fc536ac54beebcc8319f5.camel@surriel.com>
Date:   Mon, 15 Mar 2021 15:40:10 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Yu Zhao <yuzhao@...gle.com>, linux-mm@...ck.org
Cc:     Alex Shi <alex.shi@...ux.alibaba.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.com>,
        Roman Gushchin <guro@...com>, Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Yang Shi <shy828301@...il.com>,
        Ying Huang <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, page-reclaim@...gle.com
Subject: Re: [PATCH v1 09/14] mm: multigenerational lru: mm_struct list

On Sat, 2021-03-13 at 00:57 -0700, Yu Zhao wrote:

> +/*
> + * After pages are faulted in, they become the youngest generation.
> They must
> + * go through aging process twice before they can be evicted. After
> first scan,
> + * their accessed bit set during initial faults are cleared and they
> become the
> + * second youngest generation. And second scan makes sure they
> haven't been used
> + * since the first.
> + */

I have to wonder if the reductions in OOM kills and 
low-memory tab discards is due to this aging policy
change, rather than from the switch to virtual scanning.

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