linux-stable/drivers/dma-buf
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
..
heaps dma-buf: heaps: Don't track CMA dma-buf pages under RssFile 2024-01-31 19:54:58 +05:30
dma-buf-sysfs-stats.c dma-buf: Fix the typo in DMA-BUF statistics doc 2023-07-27 09:43:33 +02:00
dma-buf-sysfs-stats.h dma-buf: fix dma_buf_export init order v2 2022-12-13 08:31:45 +01:00
dma-buf.c dma-buf: Replace strlcpy() with strscpy() 2023-11-20 17:39:19 +01:00
dma-fence-array.c dma-buf/fence-array: Add fence deadline support 2023-03-25 10:55:07 -07:00
dma-fence-chain.c dma-buf/fence-chain: Add fence deadline support 2023-03-28 13:38:52 -07:00
dma-fence-unwrap.c dma-buf: add dma_fence_timestamp helper 2023-10-05 11:05:58 +02:00
dma-fence.c dma-buf/sync_file: Add SET_DEADLINE ioctl 2023-12-02 01:17:48 +02:00
dma-heap.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
dma-resv.c dma-buf: fix check in dma_resv_add_fence 2023-11-27 20:00:47 +01:00
Kconfig dma-buf: deprecate DMABUF_SYSFS_STATS 2022-06-23 10:51:43 +02:00
Makefile dma-buf: cleanup dma_fence_unwrap implementation 2022-05-30 14:16:32 +02:00
selftest.c
selftest.h
selftests.h dma-buf: add dma_fence_unwrap v2 2022-03-25 14:18:28 +01:00
st-dma-fence-chain.c kthread: add kthread_stop_put 2023-10-04 10:41:57 -07:00
st-dma-fence-unwrap.c dma-buf: Enable signaling on fence for selftests 2022-09-16 15:53:25 +02:00
st-dma-fence.c kthread: add kthread_stop_put 2023-10-04 10:41:57 -07:00
st-dma-resv.c dma-buf: Enable signaling on fence for selftests 2022-09-16 15:53:25 +02:00
sw_sync.c dma-buf/sw_sync: Add fence deadline support 2023-12-02 01:18:46 +02:00
sync_debug.c
sync_debug.h dma-buf/sw_sync: Add fence deadline support 2023-12-02 01:18:46 +02:00
sync_file.c dma-buf/sync_file: Add SET_DEADLINE ioctl 2023-12-02 01:17:48 +02:00
sync_trace.h
udmabuf.c drm-misc-next for v6.6: 2023-07-17 15:37:57 +02:00