linux-kernel - Re: [PATCH v1 0/5] Add memory shrinker to VirtIO-GPU DRM driver

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Message-ID: <caa9a2ea-d1b4-fa96-0e90-37a89aa0c000@collabora.com>
Date:   Wed, 9 Mar 2022 14:55:21 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gert Wollny <gert.wollny@...labora.com>
Cc:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        dri-devel@...ts.freedesktop.org, Dmitry Osipenko <digetx@...il.com>
Subject: Re: [PATCH v1 0/5] Add memory shrinker to VirtIO-GPU DRM driver

Hello,

On 3/9/22 11:59, Thomas Zimmermann wrote:
> Hi
> 
> Am 08.03.22 um 14:17 schrieb Dmitry Osipenko:
>> Hello,
>>
>> This patchset introduces memory shrinker for the VirtIO-GPU DRM driver.
>> During OOM, the shrinker will release BOs that are marked as "not needed"
>> by userspace using the new madvise IOCTL. The userspace in this case is
>> the Mesa VirGL driver, it will mark the cached BOs as "not needed",
>> allowing kernel driver to release memory of the cached shmem BOs on
>> lowmem
>> situations, preventing OOM kills.
> 
> Virtio-gpu is build on top of GEM shmem helpers. I have a prototype
> patchset that adds a shrinker to these helpers. If you want to go
> further, you could implement something like that instead. Panfrost and
> lima also have their own shrinker and could certainly be converted to
> the gem-shmem shrinker.

I had a thought that it could be possible to unify shrinkers into a
common DRM framework. Could you please give me a link to yours prototype
patchset?