linux-kernel - Re: [PATCH v14 08/14] mm: multi-gen LRU: support page table walks

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Message-Id: <6a0eff11-cda2-4790-bca8-f8de41981ea2@app.fastmail.com>
Date:   Fri, 28 Oct 2022 09:27:43 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Matthew Wilcox" <willy@...radead.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "Yu Zhao" <yuzhao@...gle.com>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Andi Kleen" <ak@...ux.intel.com>,
        "Aneesh Kumar" <aneesh.kumar@...ux.ibm.com>,
        "Catalin Marinas" <catalin.marinas@....com>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>,
        "Hillf Danton" <hdanton@...a.com>, "Jens Axboe" <axboe@...nel.dk>,
        "Johannes Weiner" <hannes@...xchg.org>,
        "Jonathan Corbet" <corbet@....net>, "Mel Gorman" <mgorman@...e.de>,
        "Michael Larabel" <Michael@...haellarabel.com>,
        "Michal Hocko" <mhocko@...nel.org>,
        "Mike Rapoport" <rppt@...nel.org>, "Tejun Heo" <tj@...nel.org>,
        "Vlastimil Babka" <vbabka@...e.cz>,
        "Will Deacon" <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        page-reclaim@...gle.com, "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>,
        "Vaibhav Jain" <vaibhav@...ux.ibm.com>
Subject: Re: [PATCH v14 08/14] mm: multi-gen LRU: support page table walks

On Fri, Oct 28, 2022, at 01:08, Maciej W. Rozycki wrote:
> On Wed, 26 Oct 2022, Arnd Bergmann wrote:

>> - For the special case of early ARMv6 hardware that has 32-bit
>>   atomics but not 64-bit ones, the kernel just falls back to
>>   CONFIG_GENERIC_ATOMIC64 and no cmpxchg64(). The same should work
>>   for an i486+SMP kernel. It's obviously slower, but most users
>>   can trivially avoid this by either running an i686 SMP kernel
>>   or an i486 UP kernel.
>
>  You meant an M586TSC+ SMP kernel presumably (I have such a machine), but 
> otherwise I'd be fine with such an approach too.

Sure. I just gave i686 as the example since that's already the
baseline in 90% of the remaining x86-32 distros. Slackware, ALT
and Mageia are notable exceptions that target i586, and some
others already have separate installers for i486 and i686.
The i586 distros all seem to have separate SMP/PAE kernels in
addition to the minimal i586.

    Arnd