linux-kernel - Re: [PATCH -v2 0/9] mm: make movable onlining suck less

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Date:   Tue, 11 Apr 2017 12:51:44 +1000
From:   Balbir Singh <bsingharora@...il.com>
To:     Jerome Glisse <jglisse@...hat.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        qiuxishi@...wei.com, Kani Toshimitsu <toshi.kani@....com>,
        slaoub@...il.com, Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Dan Williams <dan.j.williams@...il.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Lai Jiangshan <laijs@...fujitsu.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Tobias Regnery <tobias.regnery@...il.com>
Subject: Re: [PATCH -v2 0/9] mm: make movable onlining suck less

On Mon, 2017-04-10 at 12:35 -0400, Jerome Glisse wrote:
> On Mon, Apr 10, 2017 at 01:03:42PM +0200, Michal Hocko wrote:
> > Hi,
> > The last version of this series has been posted here [1]. It has seen
> > some more serious testing (thanks to Reza Arbab) and fixes for the found
> > issues. I have also decided to drop patch 1 [2] because it turned out to
> > be more complicated than I initially thought [3]. Few more patches were
> > added to deal with expectation on zone/node initialization.
> > 
> > I have rebased on top of the current mmotm-2017-04-07-15-53. It
> > conflicts with HMM because it touches memory hotplug as
> > well. We have discussed [4] with Jérôme and he agreed to
> > rebase on top of this rework [5] so I have reverted his series
> > before applyig mine. I will help him to resolve the resulting
> > conflicts. You can find the whole series including the HMM revers in
> > git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git branch
> > attempts/rewrite-mem_hotplug
> > 
> 
> So updated HMM patchset :
> https://cgit.freedesktop.org/~glisse/linux/log/?h=hmm-v20
> 
> I am not posting yet as it seems there is couple thing you need to
> fix in your patchset first. However if you could review :
> 
> https://cgit.freedesktop.org/~glisse/linux/commit/?h=hmm-v20&id=84fc68534e781cf6125d02b3bfdba4a51e82d9c9
> 
> As it was your idea, i just want to make sure i didn't denatured
> it :)
> 
> Also as side note, v20 fix build issue by restricting HMM to x86-64
> which is safer than pretending this can be use on any random arch
> as build failures i am getting clearly shows that thing i assumed to
> be true on all arch aren't.

In that case could you please document what an arch needs to do to enable
HMM? What are the dependencies and requirements?

Balbir Singh.