linux-kernel - Re: [PATCH] mm: don't rely on system state to detect hot-plug operations

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Message-ID: <198b5e75-f96e-0d3b-912b-ad3d24c2569d@redhat.com>
Date:   Thu, 10 Sep 2020 15:57:14 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Oscar Salvador <osalvador@...e.de>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        akpm@...ux-foundation.org, rafael@...nel.org,
        nathanl@...ux.ibm.com, cheloha@...ux.ibm.com,
        stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: don't rely on system state to detect hot-plug
 operations

>> Also, under QEMU, just do a reboot with hotplugged memory and you're in
>> the very same situation.
> 
> OK, I didn't know that. I thought the memory would be presented as a
> normal memory after reboot. Thanks for the clarification.

That's one of the cases where QEMU differs to actual hardware - it's not
added to e820, so ACPI always probes+detects+adds DIMMs during boot.

Some people (me :)) consider that a feature and not a BUG.

-- 
Thanks,

David / dhildenb