linux-kernel - Re: [PATCH v2 8/8] drm/panfrost: Switch to generic memory shrinker

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Date:   Fri, 18 Mar 2022 17:41:18 +0300
From:   Dmitry Osipenko <dmitry.osipenko@...labora.com>
To:     Steven Price <steven.price@....com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        virtualization@...ts.linux-foundation.org,
        Dmitry Osipenko <digetx@...il.com>,
        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>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh@...nel.org>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
Subject: Re: [PATCH v2 8/8] drm/panfrost: Switch to generic memory shrinker


On 3/17/22 02:04, Dmitry Osipenko wrote:
> 
> On 3/16/22 18:04, Steven Price wrote:
>> On 14/03/2022 22:42, Dmitry Osipenko wrote:
>>> Replace Panfrost's memory shrinker with a generic DRM memory shrinker.
>>>
>>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
>>> ---
>> I gave this a spin on my Firefly-RK3288 board and everything seems to
>> work. So feel free to add a:
>>
>> Tested-by: Steven Price <steven.price@....com>
>>
>> As Alyssa has already pointed out you need to remove the
>> panfrost_gem_shrinker.c file. But otherwise everything looks fine, and
>> I'm very happy to see the shrinker code gone ;)
> 
> Awesome, thank you.

Steven, could you please tell me how exactly you tested the shrinker?

I realized that today's IGT doesn't have any tests for the Panfrost's
madvise ioctl.

You may invoke "echo 2 > /proc/sys/vm/drop_caches" manually in order to
trigger shrinker while 3d app is running actively (like a game or
benchmark). Nothing crashing will be a good enough indicator that it
works okay.

I may get an RK board next week and then will be able to test it by
myself, so please don't hurry.