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Message-ID: <20190814073854.GA27249@lst.de>
Date: Wed, 14 Aug 2019 09:38:54 +0200
From: Christoph Hellwig <hch@....de>
To: Dan Williams <dan.j.williams@...el.com>
Cc: Christoph Hellwig <hch@....de>, Jason Gunthorpe <jgg@...lanox.com>,
Jérôme Glisse <jglisse@...hat.com>,
Ben Skeggs <bskeggs@...hat.com>,
Felix Kuehling <Felix.Kuehling@....com>,
Ralph Campbell <rcampbell@...dia.com>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/15] mm: remove the pgmap field from struct
hmm_vma_walk
On Tue, Aug 13, 2019 at 06:36:33PM -0700, Dan Williams wrote:
> Section alignment constraints somewhat save us here. The only example
> I can think of a PMD not containing a uniform pgmap association for
> each pte is the case when the pgmap overlaps normal dram, i.e. shares
> the same 'struct memory_section' for a given span. Otherwise, distinct
> pgmaps arrange to manage their own exclusive sections (and now
> subsections as of v5.3). Otherwise the implementation could not
> guarantee different mapping lifetimes.
>
> That said, this seems to want a better mechanism to determine "pfn is
> ZONE_DEVICE".
So I guess this patch is fine for now, and once you provide a better
mechanism we can switch over to it?
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