linux-kernel - [PATCH v3 0/2] dma-buf: system_heap: account for system heap allocation in memcg

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Message-Id: <20260116-dmabuf-heap-system-memcg-v3-0-ecc6b62cc446@redhat.com>
Date: Fri, 16 Jan 2026 15:05:37 -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 v3 0/2] dma-buf: system_heap: account for system heap
 allocation in memcg

Capture dmabuf system heap allocations in memcg following prior
conversations[1][2]. Disable this behavior by default unless configured
by "dma_heap.mem_accounting" module parameter.

[1] https://lore.kernel.org/dri-devel/Z-5GZ3kJDbhgVBPG@phenom.ffwll.local/
[2] https://lore.kernel.org/all/CABdmKX2_UOENujpW0dXe0Z0x+4V3onfGDmHf1DMOXfDha6ddOA@mail.gmail.com/

Changes in v3:
- Declare mem_accounting in include/linux/dma-heap.h, since it's
  intended for heap implementations. Make it __read_mostly while at it.
- Link to v2: https://lore.kernel.org/r/20260113-dmabuf-heap-system-memcg-v2-0-e85722cc2f24@redhat.com

Changes in v2:
- Add a module parameter to enable dma-buf cgroup accounting, disabled
  by default.
- Split system_heap logic in its own commit.
- Link to v1: https://lore.kernel.org/lkml/20251211193106.755485-2-echanude@redhat.com/

Signed-off-by: Eric Chanudet <echanude@...hat.com>
---
Eric Chanudet (2):
      dma-buf: heaps: add parameter to account allocations using cgroup
      dma-buf: system_heap: account for system heap allocation in memcg

 drivers/dma-buf/dma-heap.c          | 5 +++++
 drivers/dma-buf/heaps/system_heap.c | 7 +++++--
 include/linux/dma-heap.h            | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)
---
base-commit: 983d014aafb14ee5e4915465bf8948e8f3a723b5
change-id: 20260102-dmabuf-heap-system-memcg-c86a381d663a

Best regards,
-- 
Eric Chanudet <echanude@...hat.com>