linux-kernel - Re: [PATCH v19 22/30] drm/shmem-helper: Add common memory shrinker

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Message-ID: <d777ab50-51cf-4eed-bfec-a44eca7ba3c5@suse.de>
Date: Tue, 4 Mar 2025 12:43:13 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Dmitry Osipenko <dmitry.osipenko@...labora.com>,
 David Airlie <airlied@...il.com>, Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>,
 Christian König <christian.koenig@....com>,
 Qiang Yu <yuq825@...il.com>, Steven Price <steven.price@....com>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Emma Anholt <emma@...olt.net>, Melissa Wen <mwen@...lia.com>
Cc: kernel@...labora.com, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v19 22/30] drm/shmem-helper: Add common memory shrinker

Hi

Am 04.03.25 um 11:59 schrieb Dmitry Osipenko:
> On 3/4/25 13:29, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 05.01.24 um 19:46 schrieb Dmitry Osipenko:
>>> Introduce common drm-shmem shrinker for DRM drivers.
>> What's the status of this patch?
> It was de-prioritized on my list a year ago as I had to move to a higher
> priority problems. Rebasing and re-testing these patches takes much
> time, it either has to be split up in a smaller parts or applied in one go.

The first 11 patches seem uncontroversial to me; maybe except for patch 
9. Could they be merged any time soon?

The next batch could then be patches up to #20, which seem to be 
reviewed as well.

>
> The current status is that I started to work on v20 rather long time ago
> and the patches need to be rebased and re-tested again. Heard that
> Panthor driver may want shmem shrinker more than others today.

I've been receiving reports about low performance of ast plus gem-shmem 
recently. I suspect that the vmap/vunmap overhead could be related and 
this series would likely lessen the problem.

Best regards
Thomas

>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)