linux-kernel - Re: [PATCH v1 29/29] virtio-mem: Big Block Mode (BBM)

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Message-ID: <20201020002447.GA61630@L-31X9LVDL-1304.local>
Date:   Tue, 20 Oct 2020 08:24:47 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        virtualization@...ts.linux-foundation.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: Re: [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@...hat.com>
>Cc: Jason Wang <jasowang@...hat.com>
>Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
>Cc: Michal Hocko <mhocko@...nel.org>
>Cc: Oscar Salvador <osalvador@...e.de>
>Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
>Cc: Andrew Morton <akpm@...ux-foundation.org>
>Signed-off-by: David Hildenbrand <david@...hat.com>

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

-- 
Wei Yang
Help you, Help me