Hi, Pretty much what the subject line says, it's about 25k to 40k times faster to provide a way to duplicate an existing rings buffer registration than it is manually map/pin/register the buffers again with a new ring. Patch 1 is just a prep patch, patch 2 adds refs to struct io_mapped_ubuf, and patch 3 finally adds the register opcode to allow a ring to duplicate the registered mappings from one ring to another. This came about from discussing overhead from the varnish cache project for cases with more dynamic ring/thread creation. include/uapi/linux/io_uring.h | 8 ++++ io_uring/register.c | 6 +++ io_uring/rsrc.c | 89 ++++++++++++++++++++++++++++++++++- io_uring/rsrc.h | 2 + 4 files changed, 104 insertions(+), 1 deletion(-) -- Jens Axboe
