T.J. Mercier 1c1914d6e8 dma-buf: heaps: Don't track CMA dma-buf pages under RssFile ... DMA buffers allocated from the CMA dma-buf heap get counted under RssFile for processes that map them and trigger page faults. In addition to the incorrect accounting reported to userspace, reclaim behavior was influenced by the MM_FILEPAGES counter until linux 6.8, but this memory is not reclaimable. [1] Change the CMA dma-buf heap to set VM_PFNMAP on the VMA so MM does not poke at the memory managed by this dma-buf heap, and use vmf_insert_pfn to correct the RSS accounting. The system dma-buf heap does not suffer from this issue since remap_pfn_range is used during the mmap of the buffer, which also sets VM_PFNMAP on the VMA. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/mm/vmscan.c?id=fb46e22a9e3863e08aef8815df9f17d0f4b9aede Fixes: b61614ec31 ("dma-buf: heaps: Add CMA heap to dmabuf heaps") Signed-off-by: T.J. Mercier <tjmercier@google.com> Acked-by: Christian König <christian.koenig@amd.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240117181141.286383-1-tjmercier@google.com		2024-01-31 19:54:58 +05:30
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Kconfig	dma-buf: heaps: Add CMA heap to dmabuf heaps	2019-12-11 11:13:37 +05:30
Makefile	dma-buf: heaps: Remove heap-helpers code	2020-11-22 22:03:03 +05:30
cma_heap.c	dma-buf: heaps: Don't track CMA dma-buf pages under RssFile	2024-01-31 19:54:58 +05:30
system_heap.c	dma-buf/heaps: Don't assert held reservation lock for dma-buf mmapping	2023-06-21 20:22:20 +03:00