linux-kernel - Re: [PATCH v10 00/11] Add generic memory shrinker to VirtIO-GPU and Panfrost DRM drivers

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Date:   Thu, 16 Feb 2023 13:15:30 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, virtualization@...ts.linux-foundation.org,
        David Airlie <airlied@...il.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Qiang Yu <yuq825@...il.com>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Herring <robh@...nel.org>, Sean Paul <sean@...rly.run>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v10 00/11] Add generic memory shrinker to VirtIO-GPU and
 Panfrost DRM drivers

On Mon, Jan 30, 2023 at 03:02:10PM +0300, Dmitry Osipenko wrote:
> On 1/27/23 11:13, Gerd Hoffmann wrote:
> > On Thu, Jan 26, 2023 at 01:55:09AM +0300, Dmitry Osipenko wrote:
> >> Hello Thomas and Gerd,
> >>
> >> On 1/9/23 00:04, Dmitry Osipenko wrote:
> >>> This series:
> >>>
> >>>   1. Makes minor fixes for drm_gem_lru and Panfrost
> >>>   2. Brings refactoring for older code
> >>>   3. Adds common drm-shmem memory shrinker
> >>>   4. Enables shrinker for VirtIO-GPU driver
> >>>   5. Switches Panfrost driver to the common shrinker
> >>>
> >>> Changelog:
> >>>
> >>> v10:- Rebased on a recent linux-next.
> >>>
> >>>     - Added Rob's ack to MSM "Prevent blocking within shrinker loop" patch.
> >>>
> >>>     - Added Steven's ack/r-b/t-b for the Panfrost patches.
> >>>
> >>>     - Fixed missing export of the new drm_gem_object_evict() function.
> >>>
> >>>     - Added fixes tags to the first two patches that are making minor fixes,
> >>>       for consistency.
> >>
> >> Do you have comments on this version? Otherwise ack will be appreciated.
> >> Thanks in advance!
> > 
> > Don't feel like signing off on the locking changes, I'm not that
> > familiar with the drm locking rules.  So someone else looking at them
> > would be good.  Otherwise the series and specifically the virtio changes
> > look good to me.
> > 
> > Acked-by: Gerd Hoffmann <kraxel@...hat.com>
> 
> Thomas was looking at the the DRM core changes. I expect he'll ack them.
> 
> Thank you for reviewing the virtio patches!

I think best-case would be an ack from msm people that this looks good
(even better a conversion for msm to start using this).

Otherwise I think the locking looks reasonable, I think the tricky bits
have been moving the dma-buf rules, but if you want I can try to take
another in-depth look. But would need to be in 2 weeks since I'm going on
vacations, pls ping me on irc if I'm needed.

Otherwise would be great if we can land this soon, so that it can soak the
entire linux-next cycle to catch any driver specific issues.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch