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SubjectRe: [PATCH v1 29/29] virtio-mem: Big Block Mode (BBM) - safe memory hotunplug
On Mon, Oct 12, 2020 at 02:53:23PM +0200, David Hildenbrand wrote:
>Let's add a safe mechanism to unplug memory, avoiding long/endless loops
>when trying to offline memory - similar to in SBM.
>
>Fake-offline all memory (via alloc_contig_range()) before trying to
>offline+remove it. Use this mode as default, but allow to enable the other
>mode explicitly (which could give better memory hotunplug guarantees in
>some environments).
>
>The "unsafe" mode can be enabled e.g., via virtio_mem.bbm_safe_unplug=0
>on the cmdline.
>
>Cc: "Michael S. Tsirkin" <mst@redhat.com>
>Cc: Jason Wang <jasowang@redhat.com>
>Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
>Cc: Michal Hocko <mhocko@kernel.org>
>Cc: Oscar Salvador <osalvador@suse.de>
>Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
>Cc: Andrew Morton <akpm@linux-foundation.org>
>Signed-off-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.com>

--
Wei Yang
Help you, Help me

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