linux-kernel - [PATCH v2 1/2] dma-buf: heaps: add parameter to account allocations using cgroup

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Message-Id: <20260113-dmabuf-heap-system-memcg-v2-1-e85722cc2f24@redhat.com>
Date: Tue, 13 Jan 2026 16:32:44 -0500
From: Eric Chanudet <echanude@...hat.com>
To: Sumit Semwal <sumit.semwal@...aro.org>, 
 Benjamin Gaignard <benjamin.gaignard@...labora.com>, 
 Brian Starkey <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, 
 "T.J. Mercier" <tjmercier@...gle.com>, 
 Christian König <christian.koenig@....com>, 
 Maxime Ripard <mripard@...hat.com>
Cc: linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org, 
 Eric Chanudet <echanude@...hat.com>
Subject: [PATCH v2 1/2] dma-buf: heaps: add parameter to account
 allocations using cgroup

Add a parameter to enable dma-buf heaps allocation accounting using
cgroup for heaps that implement it. It is disabled by default as doing
so incurs caveats based on how memcg currently accounts for shared
buffers.

Signed-off-by: Eric Chanudet <echanude@...hat.com>
---
 drivers/dma-buf/dma-heap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index 8ab49924f8b71a0272dc89a609539a429feaf6c8..f72e93cb8367fa196e5b87e762a60463023887df 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -49,6 +49,11 @@ static dev_t dma_heap_devt;
 static struct class *dma_heap_class;
 static DEFINE_XARRAY_ALLOC(dma_heap_minors);

+bool mem_accounting;
+module_param(mem_accounting, bool, 0444);
+MODULE_PARM_DESC(mem_accounting,
+		 "Enable cgroup-based memory accounting for dma-buf heap allocations (default=false).");
+
 static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
 				 u32 fd_flags,
 				 u64 heap_flags)

-- 
2.52.0