linux-kernel - Re: [-next] memory hotplug regression

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Message-Id: <20170601064954.GB7593@osiris>
Date:   Thu, 1 Jun 2017 08:49:54 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Gerald Schaefer <gerald.schaefer@...ibm.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [-next] memory hotplug regression

On Wed, May 31, 2017 at 08:24:40AM +0200, Michal Hocko wrote:
> > # cat /sys/devices/system/memory/memory16/valid_zones
> > Normal Movable
> > # echo online_movable > /sys/devices/system/memory/memory16/state
> > # cat /sys/devices/system/memory/memory16/valid_zones
> > Movable
> > # cat /sys/devices/system/memory/memory18/valid_zones
> > Movable
> > # echo online > /sys/devices/system/memory/memory18/state
> > # cat /sys/devices/system/memory/memory18/valid_zones
> > Normal    <--- should be Movable
> > # cat /sys/devices/system/memory/memory17/valid_zones
> >           <--- no output
> 
> OK, so this is an independent problem and an unrelated one to the
> patch I've posted. We need two patches actually. Damn, I hate
> MMOP_ONLINE_KEEP. I will send 2 patches as a reply to this email.

Tested with your patches on top of linux-next as of yesterday, however
starting at commit fa812e869a6fe7495a17150bb2639075081ef709 ("mm/zswap.c:
delete an error message for a failed memory allocation in
zswap_dstmem_prepare()"), since the "mm: per-lruvec slab stats" patch
series breaks everything ;)

Tested-by: Heiko Carstens <heiko.carstens@...ibm.com>