[PATCHSET v2 0/3] Provide more efficient buffer registration

[Jens Axboe <axboe@kernel.dk>]

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.

Since v1:
- Actually send out the right version...

 include/uapi/linux/io_uring.h |  8 +++
 io_uring/register.c           |  6 +++
 io_uring/rsrc.c               | 95 ++++++++++++++++++++++++++++++++++-
 io_uring/rsrc.h               |  2 +
 4 files changed, 110 insertions(+), 1 deletion(-)

-- 
Jens Axboe