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

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Message-ID: <98a8be05-0882-fa8f-846d-b8f74f141041@davidgow.net>
Date:   Sun, 23 Oct 2022 22:44:22 +0800
From:   David Gow <david@...idgow.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     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

Le 22/10/22 à 00:50, Linus Torvalds a écrit :
> On Thu, Oct 20, 2022 at 8:38 PM Matthew Wilcox<willy@...radead.org>  wrote:
>> On Thu, Oct 20, 2022 at 07:10:46PM -0700, Linus Torvalds wrote:
>>> We got rid of i386 support back in 2012. Maybe it's time to get rid of
>>> i486 support in 2022?
>> Arnd suggested removing i486 last year and got a bit of pushback.
>> The most convincing to my mind was Maciej:
> Hmm. Maciej added to the cc.
> 
> I suspect we can just say "oh, well, use LTS kernels".
> 

To jump in early on the inevitable pile-on, I'm doing my occasional 
32-bit x86 KUnit test runs on an old 486 DX/2. Now, this is _mostly_ 
just a party trick -- and there are lots of people running 32-bit builds 
under QEMU et al -- but personally, the only non-amd64-capable x86 
machines I have lying around are all 486 class (including a new Vortex86 
board).

(But, at the very least, I can confirm that the latest torvalds/master 
does build, run, and pass KUnit tests on a real 486 at the moment.)

So while dropping i486 wouldn't affect anything particularly important 
for me, it'd be a minor inconvenience and make me a bit sad.

That being said, I have no objection to dropping support for 486SX CPUs 
and CONFIG_MATH_EMULATION.

Cheers,
-- David