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Fri, 06 Nov 2026 13:19:38 +0000 X-Mizu-Trace-ID: 2231816b5623e6c8 X-Migadu-Flow: FLOW_OUT From: Tao Cui To: akpm@linux-foundation.org, dgilbert@interlog.com, mkp@kernel.org, loberman@redhat.com, jmeneghi@redhat.com, kraxel@redhat.com, vivek.kasireddy@intel.com, mst@redhat.com, jasowangio@gmail.com, eperezma@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, rostedt@goodmis.org, vdonnefort@google.com, mhiramat@kernel.org, jgg@ziepe.ca, kevin.tian@intel.com, axboe@kernel.dk Cc: linux-mm@kvack.org, James.Bottomley@HansenPartnership.com, sumit.semwal@linaro.org, christian.koenig@amd.com, phasta@kernel.org, joro@8bytes.org, will@kernel.org, linux-scsi@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, kvm@vger.kernel.org, virtualization@lists.linux.dev, linux-trace-kernel@vger.kernel.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, bobbyeshleman@meta.com, mathieu.desnoyers@efficios.com, robin.murphy@arm.com, mason@kernel.org, aesteve@redhat.com, tjmercier@google.com, harry@kernel.org, vbabka@suse.cz, cui.tao@linux.dev, cuitao@kylinos.cn Subject: [PATCH 2/7] dma-buf/udmabuf: account the page array metadata to memcg Date: Fri, 6 Nov 2026 21:18:24 +0800 Message-ID: <20261106131829.3228926-3-cui.tao@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261106131829.3228926-1-cui.tao@linux.dev> References: <20261106131829.3228926-1-cui.tao@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: biomtwapq8i9nam689my9cb7yx669ghg X-Rspamd-Queue-Id: 4E33E12000E X-Rspam-User: X-Rspamd-Server: rspam11 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793971181-354563 X-HE-Meta: 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 MvWOICU2 zn+MABH1bF57iZb4BV5p17nkWY/qUS05uSFXh9uw6OF/xFln2a8v3i2st7JBjn00PqMgxvs8PWhcbHw1g7dgmJ6AM73jHnotRkp8eBq2NA+2XTSBI4FrwIHgj2vKHZopBKunLXL6CqJPETOqGcVp6WB13sknYabaPdoJcwcv1YIzF+u+70xWf3Q1x+PzakXoXAiHt3lp5aZZD60Zfok1sJZjJYuxmE2NjEJq6OIdD3qsN9b25KkAw/O43HEgcqn5vbLC2hJEPC8Jqrp3n6Y2MypLCxpkEvaJfPCFUp73fJq90COo= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Tao Cui udmabuf pins the pages of a memfd and hands them out as a dma-buf. The data pages keep the accounting of the memfd they were instantiated in, but the bookkeeping around them does not: the page pointer array and the pinned_folios array, both sized by the buffer page count, plus the transient folios array sized by the memfd folio count, are plain GFP_KERNEL. A 1GB buffer costs about 4MB of uncharged SUnreclaim memory, and size_limit_mb defaults to INT_MAX. Charge the three kvmalloc allocations so the creator pays for the metadata it induces. The system heap in the same subsystem already accounts its buffer allocation; the data pages here stay with the memfd. Signed-off-by: Tao Cui --- drivers/dma-buf/udmabuf.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index df6dd0046242..40182c82df6b 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -190,11 +190,12 @@ static void unpin_all_folios(struct udmabuf *ubuf) static __always_inline int init_udmabuf(struct udmabuf *ubuf, pgoff_t pgcnt) { - ubuf->pages = kvmalloc_objs(*ubuf->pages, pgcnt); + ubuf->pages = kvmalloc_objs(*ubuf->pages, pgcnt, GFP_KERNEL_ACCOUNT); if (!ubuf->pages) return -ENOMEM; - ubuf->pinned_folios = kvmalloc_objs(*ubuf->pinned_folios, pgcnt); + ubuf->pinned_folios = kvmalloc_objs(*ubuf->pinned_folios, pgcnt, + GFP_KERNEL_ACCOUNT); if (!ubuf->pinned_folios) return -ENOMEM; @@ -387,7 +388,7 @@ static long udmabuf_create(struct miscdevice *device, if (ret) goto err; - folios = kvmalloc_objs(*folios, max_nr_folios); + folios = kvmalloc_objs(*folios, max_nr_folios, GFP_KERNEL_ACCOUNT); if (!folios) { ret = -ENOMEM; goto err; -- 2.43.0