Re: [PATCH v3 1/8] memcg: Add MEMCG_DMABUF accounting infrastructure
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From: sashiko-bot@kernel.org
Date: 2026-10-28 15:04:31
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selinux
From: "T.J. Mercier" <tjmercier@google.com> Introduce a MEMCG_DMABUF stat counter and helpers for reserve/commit/cancel and uncharging dma-buf memory against a memory cgroup: The charge is tracked on struct dma_buf via a new memcg pointer. The page count is derived internally from PAGE_ALIGN(dmabuf->size), and the memcg reference is stored into (or cleared from) dmabuf->memcg by the helpers themselves, removing the need for callers to manage those details. The release path in dma_buf_release() is reduced to a single mem_cgroup_uncharge_dmabuf() call. This decouples accounting from the backing page allocator, avoiding the need for every exporter to pass __GFP_ACCOUNT and enabling cross-cgroup charge transfer, which is impractical with page-level accounting. The next patch wires up the charging policy in the dma-heap ioctl. Signed-off-by: T.J. Mercier <tjmercier@google.com> Signed-off-by: Albert Esteve <redacted>
Sashiko has reviewed this patch and found no issues. -- Sashiko AI review · https://sashiko.dev/#/patchset/20261027-v2_20230123_tjmercier_google_com-v3-0-78d2c4cb8647@redhat.com?part=1