在 2024/7/10 22:14, Christian König 写道:
Am 10.07.24 um 15:57 schrieb Lei Liu:
Use vm_insert_page to establish a mapping for the memory allocated
by dmabuf, thus supporting direct I/O read and write; and fix the
issue of incorrect memory statistics after mapping dmabuf memory.
Well big NAK to that! Direct I/O is intentionally disabled on DMA-bufs.
Hello! Could you explain why direct_io is disabled on DMABUF? Is there
any historical reason for this?
We already discussed enforcing that in the DMA-buf framework and this
patch probably means that we should really do that.
Regards,
Christian.
Thank you for your response. With the application of AI large model
edgeification, we urgently need support for direct_io on DMABUF to read
some very large files. Do you have any new solutions or plans for this?
Regards,
Lei Liu.
Lei Liu (2):
mm: dmabuf_direct_io: Support direct_io for memory allocated by
dmabuf
mm: dmabuf_direct_io: Fix memory statistics error for dmabuf
allocated
memory with direct_io support
drivers/dma-buf/heaps/system_heap.c | 5 +++--
fs/proc/task_mmu.c | 8 +++++++-
include/linux/mm.h | 1 +
mm/memory.c | 15 ++++++++++-----
mm/rmap.c | 9 +++++----
5 files changed, 26 insertions(+), 12 deletions(-)
