linux-kernel - Re: [PATCH v1 0/6] mm / virtio-mem: support ZONE

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Date:   Tue, 21 Jul 2020 11:59:08 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH v1 0/6] mm / virtio-mem: support ZONE_MOVABLE

On 30.06.20 16:26, David Hildenbrand wrote:
> Currently, virtio-mem does not really support ZONE_MOVABLE. While it allows
> to online fully plugged memory blocks to ZONE_MOVABLE, it does not allow
> to online partially-plugged memory blocks to ZONE_MOVABLE and will never
> consider such memory blocks when unplugging memory. This might be
> surprising for users (especially, if onlining suddenly fails).
> 
> Let's support partially plugged memory blocks in ZONE_MOVABLE, allowing
> partially plugged memory blocks to be online to ZONE_MOVABLE and also
> unplugging from such memory blocks.
> 
> This is especially helpful for testing, but also paves the way for
> virtio-mem optimizations, allowing more memory to get reliably unplugged.
> 
> Cleanup has_unmovable_pages() and set_migratetype_isolate(), providing
> better documentation of how ZONE_MOVABLE interacts with different kind of
> unmovable pages (memory offlining vs. alloc_contig_range()).
> 
> David Hildenbrand (6):
>   mm/page_alloc: tweak comments in has_unmovable_pages()
>   mm/page_isolation: don't dump_page(NULL) in set_migratetype_isolate()
>   mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate()
>   mm/page_isolation: cleanup set_migratetype_isolate()
>   mm/page_alloc: restrict ZONE_MOVABLE optimization in
>     has_unmovable_pages() to memory offlining
>   virtio-mem: don't special-case ZONE_MOVABLE
> 
>  drivers/virtio/virtio_mem.c | 47 +++++++------------------------------
>  mm/page_alloc.c             | 29 +++++++++--------------
>  mm/page_isolation.c         | 40 ++++++++++++++-----------------
>  3 files changed, 36 insertions(+), 80 deletions(-)
> 


Gentle ping, patch #1-#5 should be easy to review.

-- 
Thanks,

David / dhildenb