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dma-buf: heaps: add parameter to account allocations using cgroup

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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@redhat.com>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patch.msgid.link/20260116-dmabuf-heap-system-memcg-v3-1-ecc6b62cc446@redhat.com
This commit is contained in:
Eric Chanudet 2026-01-16 15:05:38 -05:00 • committed by Sumit Semwal
parent 1c21f240fb
commit bb33013bdd
2 changed files with 7 additions and 0 deletions
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5
drivers/dma-buf/dma-heap.c
View file

@ -49,6 +49,11 @@ static dev_t dma_heap_devt;
static struct class *dma_heap_class;
static DEFINE_XARRAY_ALLOC(dma_heap_minors);
bool __read_mostly 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
include/linux/dma-heap.h
View file

@ -46,4 +46,6 @@ const char *dma_heap_get_name(struct dma_heap *heap);
struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
extern bool mem_accounting;
#endif /* _DMA_HEAPS_H */