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Tue, 27 Jan 2026 13:29:46 +0000 From: Thomas Zimmermann To: boris.brezillon@collabora.com, loic.molinari@collabora.com, willy@infradead.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@gmail.com, simona@ffwll.ch, frank.binns@imgtec.com, matt.coster@imgtec.com Cc: dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Thomas Zimmermann Subject: [PATCH 0/3] drm/gem-shmem: Track page accessed/dirty status Date: Tue, 27 Jan 2026 14:16:35 +0100 Message-ID: <20260127132938.429288-1-tzimmermann@suse.de> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B5B6B160005 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 16ku4rp7gu4nwn5fugqax3wjot6bwmpk X-HE-Tag: 1769520588-382535 X-HE-Meta: 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 /gr6KMxH n1TNwvrnNNZb2uQcirn7Ugbv9CFB2pcTa6gTNsfyHnvD36xxDDj0OxL+5Z3qC7Zm3ZsA98lWz+g/VvC0T1K9YB/Mld5Oeh2PsC7bc7mivWP4OCyoiCHUt4ja6DQsrcCpcrjEI9QKn+hxa6cw3QHwc7Rwc+8N+CHVl2evy3Z1zWMZYydHcx2RQB4yBO3OKlD5e7U19NP+NFOFaWOjUdiTKNjACe1+b+Ybg1B65M+8kwQQ9tF9XLSBJwO/Iyg5xWWTT769pCtClNvEPFJU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Track page access/dirty status in gem-shmem for better integration with the overall memory management. Gem-shmem has long had two flags bits in struct drm_gem_shmem_object, named pages_mark_accessed_on_put and pages_mark_dirty_on_put, but never used them much; except for some odd cases in drivers. Therefore pages in gem-shmem where never marked correctly. (Other DRM memory managers do some course-grain tracking at least). Patch 1 switches from PFN-based mapping to page mapping. The pages are already available; only the mmap handling needs to be adapted. Patch 2 adds tracking access and dirty status in mmap. Patch 3 adds tracking access and dirty status in vmap. Becasue there's no fault handling here, we refer to the existing status bits in struct drm_gem_shmem_object. Each page's status will be updated by the page release in drm_gem_put_pages(). The imagiantion driver requires a small fix to make it work correctly. Tested with CONFIG_VM=y by running animations on DRM's bochs driver for several hours. This uses gem-shmem's mmap and vmap extensively. Thomas Zimmermann (3): drm/gem-shmem: Map pages in mmap fault handler drm/gem-shmem: Track folio accessed/dirty status in mmap drm/gem-shmem: Track folio accessed/dirty status in vmap drivers/gpu/drm/drm_gem_shmem_helper.c | 78 ++++++++++++++++++-------- drivers/gpu/drm/imagination/pvr_gem.c | 6 +- 2 files changed, 59 insertions(+), 25 deletions(-) -- 2.52.0