linux-kernel - Re: [PATCH v6 17/22] drm/shmem-helper: Add generic memory shrinker

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Date:   Tue, 21 Jun 2022 19:39:21 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rob Clark <robdclark@...il.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     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>,
        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>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh@...nel.org>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Qiang Yu <yuq825@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-tegra@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, amd-gfx@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, kernel@...labora.com
Subject: Re: [PATCH v6 17/22] drm/shmem-helper: Add generic memory shrinker

20.06.2022 18:37, Rob Clark пишет:
>> +static unsigned long
>> +drm_gem_shmem_shrinker_scan_objects(struct shrinker *shrinker,
>> +                                   struct shrink_control *sc)
>> +{
>> +       unsigned long nr_to_scan = sc->nr_to_scan;
>> +       bool lock_contention = false;
>> +       unsigned long freed;
>> +
>> +       /* purge as many objects as we can */
>> +       freed = drm_gem_shmem_shrinker_run_objects_scan(shrinker, nr_to_scan,
>> +                                                       &lock_contention, false);
>> +
>> +       /* evict as many objects as we can */
>> +       if (freed < nr_to_scan)
> oh, one other small note, both in scan_objects() and count_objects(),
> you should check that get_nr_swap_pages()>0 before counting
> evictable/willneed objects.  (And you probably want to keep separate
> LRUs for dontneed vs willneed to accomplish that.)  At least for CrOS,
> inside the VM there is no swap enabled (but instead we rely on zram
> swap in the host.. plus vm-balloon to balance memory pressure between
> host and guest)

Noted, thank you!