linux-kernel - Re: [PATCH v2 00/16] Multigenerational LRU Framework

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Date:   Wed, 14 Apr 2021 08:56:47 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Rik van Riel <riel@...riel.com>
Cc:     "Huang, Ying" <ying.huang@...el.com>, Yu Zhao <yuzhao@...gle.com>,
        Dave Chinner <david@...morbit.com>,
        Jens Axboe <axboe@...nel.dk>,
        SeongJae Park <sj38.park@...il.com>,
        Linux-MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Benjamin Manes <ben.manes@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Michael Larabel <michael@...haellarabel.com>,
        Michal Hocko <mhocko@...e.com>,
        Michel Lespinasse <michel@...pinasse.org>,
        Roman Gushchin <guro@...com>,
        Rong Chen <rong.a.chen@...el.com>,
        SeongJae Park <sjpark@...zon.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Yang Shi <shy828301@...il.com>, Zi Yan <ziy@...dia.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        Kernel Page Reclaim v2 <page-reclaim@...gle.com>
Subject: Re: [PATCH v2 00/16] Multigenerational LRU Framework

> Now imagine we have an 8 node system, and memory
> pressure in the DMA32 zone of node 0.

The question is how much do we still care about DMA32.
If there are problems they can probably just turn on the IOMMU for
these IO mappings.

-Andi