linux-kernel - Re: [PATCH v2 8/8] mm/memory_hotplug: allow to specify a default online

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Message-ID: <8860f1db-4c75-d4ef-2ded-1cbbfb992d73@redhat.com>
Date:   Tue, 17 Mar 2020 12:08:31 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-hyperv@...r.kernel.org, Wei Yang <richard.weiyang@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Baoquan He <bhe@...hat.com>
Subject: Re: [PATCH v2 8/8] mm/memory_hotplug: allow to specify a default
 online_type

On 17.03.20 11:49, David Hildenbrand wrote:
> For now, distributions implement advanced udev rules to essentially
> - Don't online any hotplugged memory (s390x)
> - Online all memory to ZONE_NORMAL (e.g., most virt environments like
>   hyperv)
> - Online all memory to ZONE_MOVABLE in case the zone imbalance is taken
>   care of (e.g., bare metal, special virt environments)
> 
> In summary: All memory is usually onlined the same way, however, the
> kernel always has to ask user space to come up with the same answer.
> E.g., Hyper-V always waits for a memory block to get onlined before
> continuing, otherwise it might end up adding memory faster than
> hotplugging it, which can result in strange OOM situations. This waiting

s/hotplugging/onlining/

-- 
Thanks,

David / dhildenb