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

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Message-ID: <20180723110928.GC31229@dhcp22.suse.cz>
Date:   Mon, 23 Jul 2018 13:09:28 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Dan Williams <dan.j.williams@...el.com>, pasha.tatashin@...cle.com,
        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.m.jordan@...cle.com, Ingo Molnar <mingo@...hat.com>,
        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>
Subject: Re: [PATCH v2 00/14] mm: Asynchronous + multithreaded memmap init
 for ZONE_DEVICE

On Thu 19-07-18 11:41:10, Dave Hansen wrote:
> On 07/18/2018 05:05 AM, Michal Hocko wrote:
> > On Tue 17-07-18 10:32:32, Dan Williams wrote:
> >> On Tue, Jul 17, 2018 at 8:50 AM Michal Hocko <mhocko@...nel.org> wrote:
> > [...]
> >>> Is there any reason that this work has to target the next merge window?
> >>> The changelog is not really specific about that.
> >>
> >> Same reason as any other change in this space, hardware availability
> >> continues to increase. These patches are a direct response to end user
> >> reports of unacceptable init latency with current kernels.
> > 
> > Do you have any reference please?
> 
> 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?

-- 
Michal Hocko
SUSE Labs