linux-kernel - Re: [PATCH v2 07/10] mm/memory_hotplug: Introduce offline_and_remove

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Message-ID: <156601a9-e919-b88f-2278-97ecee554d21@redhat.com>
Date:   Wed, 11 Mar 2020 18:19:04 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, virtio-dev@...ts.oasis-open.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Oscar Salvador <osalvador@...e.com>,
        Michal Hocko <mhocko@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Dan Williams <dan.j.williams@...el.com>, Qian Cai <cai@....pw>
Subject: Re: [PATCH v2 07/10] mm/memory_hotplug: Introduce
 offline_and_remove_memory()

On 11.03.20 18:14, David Hildenbrand wrote:
> virtio-mem wants to offline and remove a memory block once it unplugged
> all subblocks (e.g., using alloc_contig_range()). Let's provide
> an interface to do that from a driver. virtio-mem already supports to
> offline partially unplugged memory blocks. Offlining a fully unplugged
> memory block will not require to migrate any pages. All unplugged
> subblocks are PageOffline() and have a reference count of 0 - so
> offlining code will simply skip them.
> 
> All we need is an interface to offline and remove the memory from kernel
> module context, where we don't have access to the memory block devices
> (esp. find_memory_block() and device_offline()) and the device hotplug
> lock.
> 
> To keep things simple, allow to only work on a single memory block.
> 

Lost the ACK from Michael

Acked-by: Michal Hocko <mhocko@...e.com> [1]

[1] https://lkml.kernel.org/r/20200302142737.GP4380@dhcp22.suse.cz

-- 
Thanks,

David / dhildenb