linux-kernel - Re: [PATCH 2/2] x86/Kconfig: deprecate DISCONTIGMEM support for 32-bit

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Message-ID: <20190424142037.GV18914@techsingularity.net>
Date:   Wed, 24 Apr 2019 15:20:37 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/Kconfig: deprecate DISCONTIGMEM support for
 32-bit

On Wed, Apr 24, 2019 at 04:24:12PM +0300, Mike Rapoport wrote:
> Mel Gorman says:
>   32-bit NUMA systems should be non-existent in practice.  The last NUMA
>   system I'm aware of that was both NUMA and 32-bit only died somewhere
>   between 2004 and 2007. If someone is running a 64-bit capable system in
>   32-bit mode with NUMA, they really are just punishing themselves for fun.
> 
> Mark DISCONTIGMEM broken for now and remove it in a couple of releases.
> 
> Suggested-by: Christoph Hellwig <hch@...radead.org>
> Suggested-by: Mel Gorman <mgorman@...hsingularity.net>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>

It was really Christoph that suggested marking it broken but I do agree
that it should be marked broken to see if anyone complains and if not,
there is no real reason to keep discontig available on x86.

Acked-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs