On Wed, 31 Jul 2024 17:01:31 +0800, Chenliang Li wrote:
> Registered buffers are stored and processed in the form of bvec array,
> each bvec element typically points to a PAGE_SIZE page but can also work
> with hugepages. Specifically, a buffer consisting of a hugepage is
> coalesced to use only one hugepage bvec entry during registration.
> This coalescing feature helps to save both the space and DMA-mapping time.
>
> However, currently the coalescing feature doesn't work for multi-hugepage
> buffers. For a buffer with several 2M hugepages, we still split it into
> thousands of 4K page bvec entries while in fact, we can just use a
> handful of hugepage bvecs.
>
> [...]
Applied, thanks!
[1/2] io_uring/rsrc: store folio shift and mask into imu
commit: cbca98cb933728bb5eee39ba6bfe184932931e3d
[2/2] io_uring/rsrc: enable multi-hugepage buffer coalescing
commit: 04eedfc93ea1121bb6b00f27b14c58973f7de1c9
Best regards,
--
Jens Axboe
