linux-kernel - Re: [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE

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Message-ID: <CAPcyv4hZUgoMvUTcQLVQWvpvHnJYoPaet4b2VE-qPLtUPDgSaQ@mail.gmail.com>
Date:   Mon, 10 Sep 2018 12:06:04 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Rich Felker <dalias@...c.org>, Jan Kara <jack@...e.cz>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-mm <linux-mm@...ck.org>, Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Luck, Tony" <tony.luck@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Alexander Duyck <alexander.h.duyck@...el.com>
Subject: Re: [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init for ZONE_DEVICE

[ adding Alex ]

On Tue, Jul 24, 2018 at 12:29 AM, Michal Hocko <mhocko@...nel.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.