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Date: Tue, 11 Apr 2017 12:47:10 +0200
From: Michal Hocko <mhocko@kernel.org>
To: Igor Mammedov <imammedo@redhat.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
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Subject: Re: [PATCH -v2 0/9] mm: make movable onlining suck less
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On Tue 11-04-17 11:53:22, Igor Mammedov wrote:
> On Tue, 11 Apr 2017 10:41:42 +0200
> Michal Hocko <mhocko@kernel.org> wrote:
> 
> > On Tue 11-04-17 10:01:52, Igor Mammedov wrote:
> > > On Mon, 10 Apr 2017 16:56:39 +0200
> > > Michal Hocko <mhocko@kernel.org> wrote:  
> > [...]
> > > > > #echo online_kernel > memory32/state
> > > > > write error: Invalid argument
> > > > > // that's not what's expected    
> > > > 
> > > > this is proper behavior with the current implementation. Does anything
> > > > depend on the zone reusing?  
> > > if we didn't have zone imbalance issue in design,
> > > the it wouldn't matter but as it stands it's not
> > > minore issue.
> > > 
> > > Consider following,
> > > one hotplugs some memory and onlines it as movable,
> > > then one needs to hotplug some more but to do so 
> > > one one needs more memory from zone NORMAL and to keep
> > > zone balance some memory in MOVABLE should be reonlined
> > > as NORMAL  
> > 
> > Is this something that we absolutely have to have right _now_? Or are you
> > OK if I address this in follow up series? Because it will make the
> > current code slightly more complex and to be honest I would rather like
> > to see this "core" merge and build more on top.
>
> It's fine by me to do it on top.

OK, I will document this in the changelog of the patch 6.

"
Please note that this patch also changes the original behavior when
offlining a memory block adjacent to another zone (Normal vs. Movable)
used to allow to change its movable type. This will be handled later.
"
-- 
Michal Hocko
SUSE Labs