linux-kernel - Re: [PATCH 0/6] mm: make movable onlining suck less

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Date:   Thu, 6 Apr 2017 18:46:34 +0100
From:   Mel Gorman <mgorman@...e.de>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Reza Arbab <arbab@...ux.vnet.ibm.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Yasuaki Ishimatsu <yasu.isimatu@...il.com>,
        Tang Chen <tangchen@...fujitsu.com>, qiuxishi@...wei.com,
        Kani Toshimitsu <toshi.kani@....com>, slaoub@...il.com,
        Joonsoo Kim <js1304@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Zhang Zhen <zhenzhang.zhang@...wei.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>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Dan Williams <dan.j.williams@...il.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Lai Jiangshan <laijs@...fujitsu.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 0/6] mm: make movable onlining suck less

On Thu, Apr 06, 2017 at 07:12:42PM +0200, Michal Hocko wrote:
> > ---8<---
> > mm, vmscan: prevent kswapd sleeping prematurely due to mismatched classzone_idx -fix
> > 
> > The patch "mm, vmscan: prevent kswapd sleeping prematurely due to mismatched
> > classzone_idx" has different initial starting conditions when kswapd
> > is asleep. kswapd initialises it properly when it starts but the patch
> > initialises kswapd_classzone_idx early and trips on a warning in
> > free_area_init_node. This patch leaves the kswapd_classzone_idx as zero
> > and defers to kswapd to initialise it properly when it starts.
> 
> It will start during the online phase which is later than this physical
> memory hotadd.
> 

Good, that's what appeared to be happening at least. It would be
somewhat insane if kswapd was running before zones were initialised.

> > This is a fix to the mmotm patch
> > mm-vmscan-prevent-kswapd-sleeping-prematurely-due-to-mismatched-classzone_idx.patch
> > 
> > Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> Yes, that is what I would expect. Feel free to add
> Acked-by: Michal Hocko <mhocko@...e.com>
> 
> if this is routed as a separate patch. Although I expect Andrew will
> fold it into the original patch.
> 

I added the ack anyway and resent the patch so it doesn't get lost in
the middle of a thread. Thanks.

-- 
Mel Gorman
SUSE Labs