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[109.252.136.92]) by smtp.googlemail.com with ESMTPSA id y19-20020a2e3213000000b0025a69521bbdsm1106096ljy.121.2022.06.21.09.39.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Jun 2022 09:39:27 -0700 (PDT) Message-ID: Date: Tue, 21 Jun 2022 19:39:21 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH v6 17/22] drm/shmem-helper: Add generic memory shrinker Content-Language: en-US To: Rob Clark , Dmitry Osipenko Cc: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Daniel Almeida , Gert Wollny , Gustavo Padovan , Daniel Stone , Tomeu Vizoso , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Herring , Steven Price , Alyssa Rosenzweig , Emil Velikov , Robin Murphy , Qiang Yu , Sumit Semwal , =?UTF-8?Q?Christian_K=c3=b6nig?= , "Pan, Xinhui" , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Alex Deucher , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-tegra@vger.kernel.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, kernel@collabora.com References: <20220526235040.678984-1-dmitry.osipenko@collabora.com> <20220526235040.678984-18-dmitry.osipenko@collabora.com> From: Dmitry Osipenko In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 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!