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[100.17.22.234]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8bab5452ec6sm292782685a.1.2025.12.11.11.31.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Dec 2025 11:31:47 -0800 (PST) From: Eric Chanudet To: Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , Christian Koenig , Maxime Ripard Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org, Eric Chanudet Subject: [PATCH] dma-buf: system_heap: account for system heap allocation in memcg Date: Thu, 11 Dec 2025 14:31:07 -0500 Message-ID: <20251211193106.755485-2-echanude@redhat.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The system dma-buf heap lets userspace allocate buffers from the page allocator. However, these allocations are not accounted for in memcg, allowing processes to escape limits that may be configured. Pass the __GFP_ACCOUNT for our allocations to account them into memcg. Userspace components using the system heap can be constrained with, e.g: systemd-run --user --scope -p MemoryMax=3D10M ... Signed-off-by: Eric Chanudet --- drivers/dma-buf/heaps/system_heap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/sy= stem_heap.c index 4c782fe33fd4..c91fcdff4b77 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -38,10 +38,10 @@ struct dma_heap_attachment { bool mapped; }; =20 -#define LOW_ORDER_GFP (GFP_HIGHUSER | __GFP_ZERO) +#define LOW_ORDER_GFP (GFP_HIGHUSER | __GFP_ZERO | __GFP_ACCOUNT) #define HIGH_ORDER_GFP (((GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN \ | __GFP_NORETRY) & ~__GFP_RECLAIM) \ - | __GFP_COMP) + | __GFP_COMP | __GFP_ACCOUNT) static gfp_t order_flags[] =3D {HIGH_ORDER_GFP, HIGH_ORDER_GFP, LOW_ORDER_= GFP}; /* * The selection of the orders used for allocation (1MB, 64K, 4K) is desig= ned --=20 2.52.0