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[100.17.20.16]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8907726041fsm172437926d6.45.2026.01.13.13.33.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Jan 2026 13:33:17 -0800 (PST) From: Eric Chanudet Date: Tue, 13 Jan 2026 16:32:45 -0500 Subject: [PATCH v2 2/2] dma-buf: system_heap: account for system heap allocation in memcg Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260113-dmabuf-heap-system-memcg-v2-2-e85722cc2f24@redhat.com> References: <20260113-dmabuf-heap-system-memcg-v2-0-e85722cc2f24@redhat.com> In-Reply-To: <20260113-dmabuf-heap-system-memcg-v2-0-e85722cc2f24@redhat.com> To: Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T.J. Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , 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 X-Mailer: b4 0.14.2 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 __GFP_ACCOUNT for system heap allocations, based on the dma_heap.mem_accounting parameter, to use memcg and account for them. Signed-off-by: Eric Chanudet --- drivers/dma-buf/heaps/system_heap.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/sy= stem_heap.c index 4c782fe33fd497a74eb5065797259576f9b651b6..139b50df64ed4c4a6fdd69f25fe= 48324fbe2c481 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -52,6 +52,8 @@ static gfp_t order_flags[] =3D {HIGH_ORDER_GFP, HIGH_ORDE= R_GFP, LOW_ORDER_GFP}; static const unsigned int orders[] =3D {8, 4, 0}; #define NUM_ORDERS ARRAY_SIZE(orders) =20 +extern bool mem_accounting; + static int dup_sg_table(struct sg_table *from, struct sg_table *to) { struct scatterlist *sg, *new_sg; @@ -320,14 +322,17 @@ static struct page *alloc_largest_available(unsigned = long size, { struct page *page; int i; + gfp_t flags; =20 for (i =3D 0; i < NUM_ORDERS; i++) { if (size < (PAGE_SIZE << orders[i])) continue; if (max_order < orders[i]) continue; - - page =3D alloc_pages(order_flags[i], orders[i]); + flags =3D order_flags[i]; + if (mem_accounting) + flags |=3D __GFP_ACCOUNT; + page =3D alloc_pages(flags, orders[i]); if (!page) continue; return page; --=20 2.52.0