linux-kernel - Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM

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Message-ID: <304EB2DB-3EB9-4D2E-8807-E170B9061A63@zytor.com>
Date: Fri, 16 May 2025 11:28:20 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Dave Hansen <dave.hansen@...el.com>, Ingo Molnar <mingo@...nel.org>
CC: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Jonathan Corbet <corbet@....net>, Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>, Jan Kiszka <jan.kiszka@...mens.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Michael Roth <michael.roth@....com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Sandipan Das <sandipan.das@....com>, Juergen Gross <jgross@...e.com>,
        Tom Lendacky <thomas.lendacky@....com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCHv3 2/4] x86/64/mm: Make SPARSEMEM_VMEMMAP the only memory model

On May 16, 2025 8:46:07 AM PDT, Dave Hansen <dave.hansen@...el.com> wrote:
>On 5/16/25 08:35, Ingo Molnar wrote:
>>   .config.opensuse.default:    CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>>   .config.ubuntu.localinstall: CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>>   .config.fedora.generic:      CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>>   .config.rhel.generic:        CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
>
>That reminds me...
>
>Does everybody keep their own local copies of these configs in their
>environment? I do, and I refresh them periodically from the distros. I
>assume everybody else is doing something similar.
>
>Is there a better way?

What I do is keep a set of minimal configs which are the deltas from the default.