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From: Dan Williams <dan.j.williams@intel.com>
Date: Mon, 10 Sep 2018 12:06:04 -0700
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Subject: Re: [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE
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To: Michal Hocko <mhocko@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>, Pavel Tatashin <pasha.tatashin@oracle.com>, Rich Felker <dalias@libc.org>, Jan Kara <jack@suse.cz>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Heiko Carstens <heiko.carstens@de.ibm.com>, linux-mm <linux-mm@kvack.org>, Paul Mackerras <paulus@samba.org>, "H. Peter Anvin" <hpa@zytor.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, "linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>, the arch/x86 maintainers <x86@kernel.org>, Matthew Wilcox <willy@infradead.org>, Daniel Jordan <daniel.m.jordan@oracle.com>, Ingo Molnar <mingo@redhat.com>, Fenghua Yu <fenghua.yu@intel.com>, Jerome Glisse <jglisse@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "Luck, Tony" <tony.luck@intel.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Michael Ellerman <mpe@ellerman.id.au>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Andrew Morton <akpm@linux-foundation.org>, Christoph Hellwig <hch@lst.de>, Alexander Duyck <alexander.h.duyck@intel.com>

[ adding Alex ]

On Tue, Jul 24, 2018 at 12:29 AM, Michal Hocko <mhocko@kernel.org> wrote:
> On Mon 23-07-18 09:15:32, Dave Hansen wrote:
>> On 07/23/2018 04:09 AM, Michal Hocko wrote:
>> > On Thu 19-07-18 11:41:10, Dave Hansen wrote:
>> >> Are you looking for the actual end-user reports?  This was more of a
>> >> case of the customer plugging in some persistent memory DIMMs, noticing
>> >> the boot delta and calling the folks who sold them the DIMMs (Intel).
>> > But this doesn't sound like something to rush a solution for in the
>> > upcoming merge windown, does it?
>>
>> No, we should not rush it.  We'll try to rework it properly.
>
> Thanks a lot Dave! I definitely do not mean to block this at all. I just
> really do not like to have the code even more cluttered than we have
> now.

Hi Michal,

I'm back from vacation. I owe you an apology I was entirely too
prickly on this thread, and the vacation cool-off-time was much
needed.

I come back to see that Alex has found a trove of low hanging fruit to
speed up ZONE_DEVICE init and ditch most of the complication I was
pushing. I'll let him chime in on the direction he wants to take this.