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[100.17.19.56]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8971cca6fddsm186357896d6.19.2026.02.18.09.14.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Feb 2026 09:14:57 -0800 (PST) From: Eric Chanudet Subject: [PATCH v2 0/3] dma-buf: heaps: cma: enable dmem cgroup accounting Date: Wed, 18 Feb 2026 12:14:09 -0500 Message-Id: <20260218-dmabuf-heap-cma-dmem-v2-0-b249886fb7b2@redhat.com> MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAAAAAAAC/23NQQ6CMBCF4auQWTumLQSpK+5hWIx0arsokBYbD eHuVuLS5feS+WeDxNFzgmu1QeTsk5+nAnWqYHQ0PRi9KQYlVCuk6tAEuj8tOqYFx0DFHNA2Ugl SxjbUQTldIlv/OrK3odj5tM7xfXzJ8rv+grX4H8wSJdZtc2HSumat+8jG0Xoe5wDDvu8fvz0pl 7kAAAA= X-Change-ID: 20260128-dmabuf-heap-cma-dmem-f4120a2df4a8 To: Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, Maxime Ripard , Albert Esteve , linux-mm@kvack.org, Eric Chanudet , Maxime Ripard X-Mailer: b4 0.14.2 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 4XQ6mStzHC-LT5iRayZCRwgrx4RPpNk-3A2Fgdk_aJE_1771434898 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Stat-Signature: pbzhn79q3k347dztixsat939bsu773sj X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 90B88C000D X-HE-Tag: 1771434903-327801 X-HE-Meta: U2FsdGVkX18muCRaBYa3TdLWWh/pJhIqZsli9t1/+w7J9r5UBqbYqP7Ho++UdArohtvfmON5Zo4xYBzIdlb8FHO252c0wxoV/Ivq/Mz8swdLZTSfBs7URpa9QtWZTkdFmG9vJVyEMjD16/8kpAQeE3rh1EtQnYEnvi98005V7i6AcZBOkFjBPEkXmp9bb+EG3WPGyHQJATxd2MxjlmVBTyJx0CLbIjZIeSbVEZR+OG+LISQEdeo7/GTJnbHTPQjGe8cxx9DUa+FoR3747t+6WqDbovo8FOEwfrm99GCK1S68HAp6g8v8yjj3cci54znaKp06eGcbTH5H1JXoQGpVf5PS9mal4Ftf5grd7U5IW3s45k0PvFTYOvUnY1F8BrXaijO0pdYNJqNrz4Z+H0Ih6rhstC6E7s2uRrvnzVnRCjmW2K6OUOyizVfgqvseK1rcq2iBUgLzN1SXOsLrqiRzXHuTmXJEhwkiIGz+b4SYaY28zyfVw0UhjHgi5Y+cBJ5dfvpLvymjMsuoPxBzZlEu7lwwm0bOnh9ZB+KQBI5TMiJeiVXoB5ouLWTn/cVd9IE/AmN4QwC9zOUirchfsZwj6ZL8860q0VCkZjr+LiYNgxtvP1V93KBGJdXVyK0xkIKhLIut+n+j3Hw18X/6r1aydanfoXH45tYtrYsEbpMrYTYyzKv+K0enDw5Hnx3Ea+efkOJhL8jImtYvRhLCLt/tbX8A2NKuqZnqq+aAWy8yfvt6J4FNruGcpPIC1/Il5ObRojdTyjo9LW3TucSd6KMqWaUsiee0osVdan3NaW324aSqLtJW6hLYERIAwrKji9izEpS2XE7jRy+0w8vT5Q9jZtJ/C+ePIt2+r0h73Epr7jMEdwEe2pgsDV8oL1PpMY+BA8Nh4l6OFT1pdyqSwgP0QYk99otuWLO6raZpbFrsxmQG90Mo4mGHGZDuaMBHHkJM7XX7RL9nb4X64ULl104 8J8z/+uY 7zyC1K2H7ZXjK5cFG1oisfaJ0jsDr1xHZSmMLiTy1SVQoAypqGHUZgPcPxVS+pXt/IZXI0xXIbWY/t8M7fefdk/2CegQwwVSn1QY0ipHCNGtQXOb7tycT/u0y5HI8Why+nmJvtRpsDxlBon+Kx97tHz5yYDPDHT0ukFumAyMf3y8FS6/aYA7X4SSqQqxGp84WXhgl7sEZ/0JSVVqU+jP4EcIXq1LWctPzh0NShQHe1Ams7vUln8Og1f+I3m0aLx5Vf08ng8vZt1K8EX+Snz193zpii0bSHRYFGSTEUWRd3nh+eQVAGXINltgKF8RUykhs7RqYTXyDnEvmQEXqKVazjKpsKBzDhbAscbzdyEpIJvB+Cx74HH9Hev0ffdNGs/P+5sV10suxs19Du/DjvKfor1N8Zm+U4qo7DfsZmA8CAv1Z5NAjXEHuv1K4X+Ps5jSO2v8GvkTZC5glX4cucBWgFN2Bi3EkjS/ZsQg8lI/fQpZhztk= 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: An earlier series[1] from Maxime introduced dmem to the cma allocator in an attempt to use it generally for dma-buf. Restart from there and apply the charge in the narrower context of the CMA dma-buf heap instead. In line with introducing cgroup to the system heap[2], this behavior is enabled based on dma_heap.mem_accounting, disabled by default. dmem is chosen for CMA heaps as it allows limits to be set for each region backing each heap. The charge is only put in the dma-buf heap for now as it guaranties it can be accounted against a userspace process that requested the allocation. [1] https://lore.kernel.org/all/20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.org/ [2] https://lore.kernel.org/all/20260116-dmabuf-heap-system-memcg-v3-0-ecc6b62cc446@redhat.com/ Signed-off-by: Eric Chanudet --- Changes in v2: - Rebase on Maxime's introduction of dmem to the cma allocator: https://lore.kernel.org/all/20250310-dmem-cgroups-v1-0-2984c1bc9312@kernel.org/ - Remove the dmem region registration from the cma dma-buf heap - Remove the misplaced logic for the default region. - Link to v1: https://lore.kernel.org/r/20260130-dmabuf-heap-cma-dmem-v1-1-3647ea993e99@redhat.com --- Eric Chanudet (1): dma-buf: heaps: cma: charge each cma heap's dmem Maxime Ripard (2): cma: Register dmem region for each cma region cma: Provide accessor to cma dmem region drivers/dma-buf/heaps/cma_heap.c | 15 ++++++++++++++- include/linux/cma.h | 9 +++++++++ mm/cma.c | 20 +++++++++++++++++++- mm/cma.h | 3 +++ 4 files changed, 45 insertions(+), 2 deletions(-) --- base-commit: 948e195dfaa56e48eabda591f97630502ff7e27e change-id: 20260128-dmabuf-heap-cma-dmem-f4120a2df4a8 Best regards, -- Eric Chanudet