From: Andrew Morton <akpm@linux-foundation.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Rik van Riel <riel@redhat.com>,
linux-nvdimm <linux-nvdimm@ml01.01.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>, Linux MM <linux-mm@kvack.org>,
Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Jerome Glisse <j.glisse@gmail.com>,
Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: Re: [RFC PATCH] mm: support CONFIG_ZONE_DEVICE + CONFIG_ZONE_DMA
Date: Tue, 26 Jan 2016 14:51:53 -0800 [thread overview]
Message-ID: <20160126145153.44e4f38b04200209d133c0a3@linux-foundation.org> (raw)
In-Reply-To: <CAPcyv4hytzxpNt2RT6b5M6iuqz6V3GdSnO3eHwqpHVt4gfXPxg@mail.gmail.com>
On Tue, 26 Jan 2016 14:33:48 -0800 Dan Williams <dan.j.williams@intel.com> wrote:
> >> Towards this end, alias ZONE_DMA and ZONE_DEVICE to work around needing
> >> to maintain a unique zone number for ZONE_DEVICE. Record the geometry
> >> of ZONE_DMA at init (->init_spanned_pages) and use that information in
> >> is_zone_device_page() to differentiate pages allocated via
> >> devm_memremap_pages() vs true ZONE_DMA pages. Otherwise, use the
> >> simpler definition of is_zone_device_page() when ZONE_DMA is turned off.
> >>
> >> Note that this also teaches the memory hot remove path that the zone may
> >> not have sections for all pfn spans (->zone_dyn_start_pfn).
> >>
> >> A user visible implication of this change is potentially an unexpectedly
> >> high "spanned" value in /proc/zoneinfo for the DMA zone.
> >
> > Well, all these icky tricks are to avoid increasing ZONES_SHIFT, yes?
> > Is it possible to just use ZONES_SHIFT=3?
>
> Last I tried I hit this warning in mm/memory.c
>
> #warning Unfortunate NUMA and NUMA Balancing config, growing
> page-frame for last_cpupid.
Well yes, it may take a bit of work - perhaps salvaging a bit from
somewhere else if poss. But that might provide a better overall
solution so could you please have a think?
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next prev parent reply other threads:[~2016-01-26 22:51 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-26 0:06 Dan Williams
2016-01-26 6:00 ` Sudip Mukherjee
2016-01-26 17:07 ` Dan Williams
2016-01-26 19:10 ` Mark
2016-01-26 21:42 ` Vlastimil Babka
2016-01-26 21:48 ` Dan Williams
2016-01-26 22:11 ` Andrew Morton
2016-01-26 22:33 ` Dan Williams
2016-01-26 22:51 ` Andrew Morton [this message]
2016-01-26 23:11 ` Dan Williams
2016-01-27 1:18 ` Joonsoo Kim
2016-01-27 1:37 ` Dan Williams
2016-01-27 2:15 ` Joonsoo Kim
2016-01-27 3:23 ` Dan Williams
2016-01-27 3:52 ` Joonsoo Kim
2016-01-27 4:26 ` Dan Williams
2016-01-27 5:52 ` Joonsoo Kim
2016-01-27 7:46 ` Mel Gorman
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