linux-kernel - Re: [RFC v1 00/19] Modify zonelist to nodelist v1

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Message-ID: <20191126154101.GJ20912@dhcp22.suse.cz>
Date:   Tue, 26 Nov 2019 16:41:01 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     Pengfei Li <fly@...nel.page>,
        "lixinhai.lxh@...il.com" <lixinhai.lxh@...il.com>,
        akpm <akpm@...ux-foundation.org>,
        mgorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>, cl <cl@...ux.com>,
        "iamjoonsoo.kim" <iamjoonsoo.kim@....com>, guro <guro@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC v1 00/19] Modify zonelist to nodelist v1

On Tue 26-11-19 10:30:56, Qian Cai wrote:
> 
> 
> > On Nov 25, 2019, at 3:39 AM, Michal Hocko <mhocko@...nel.org> wrote:
> > 
> > People do care about ZONE_MOVABLE and if there is a non-movable memory
> > sitting there then it is a bug. Please report that.
> 
> It is trivial to test yourself if you ever care. Just pass kernelcore=
> to as many NUMA machines you could find, an then test if ever possible
> to offline those memory.

I definitely do care if you can provide more details (ideally in a
separate email thread). I am using movable memory for memory hotplug
usecases and so far I do not remember any kernel/non-movable allocations
would make it in - modulo bugs when somebody might use __GFP_MOVABLE
when it is not appropriate.

-- 
Michal Hocko
SUSE Labs