Re: DISCONTIGMEM is deprecated
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- To: Meelis Roos <mroos@xxxxxxxx>
- Subject: Re: DISCONTIGMEM is deprecated
- From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
- Date: Sun, 28 Apr 2019 01:13:53 -0700
- Cc: Christopher Lameter <cl@xxxxxxxxx>, Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Mikulas Patocka <mpatocka@xxxxxxxxxx>, James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Vlastimil Babka <vbabka@xxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx
- In-reply-to: <25cabb7c-9602-2e09-2fe0-cad3e54595fa@linux.ee>
- References: <20190419094335.GJ18914@techsingularity.net> <20190419140521.GI7751@bombadil.infradead.org> <0100016a461809ed-be5bd8fc-9925-424d-9624-4a325a7a8860-000000@email.amazonses.com> <25cabb7c-9602-2e09-2fe0-cad3e54595fa@linux.ee>
- User-agent: Mutt/1.9.2 (2017-12-15)
On Tue, Apr 23, 2019 at 07:49:57PM +0300, Meelis Roos wrote:
> > > ia64 (looks complicated ...)
> >
> > Well as far as I can tell it was not even used 12 or so years ago on
> > Itanium when I worked on that stuff.
>
> My notes tell that on UP ia64 (RX2620), !NUMA was broken with both
> SPARSEMEM and DISCONTIGMEM. NUMA+SPARSEMEM or !NUMA worked. Even
> NUMA+DISCONTIGMEM worked, that was my config on 2-CPU RX2660.
ia64 has a such a huge number of memory model choices. Maybe we
need to cut it down to a small set that actually work.
That includes fund bits like the 'VIRTUAL_MEM_MAP' option where the
comment claims:
# VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.
# VIRTUAL_MEM_MAP has been retained for historical reasons.
but it still is selected as the default if sparsemem is not enabled..
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