[PATCHSET 0/5] io_uring restrictions cleanups and improvements

[Jens Axboe <axboe@kernel.dk>]

Hi,

In doing the task based restriction sets, I found myself doing a few
cleanups and improvements along the way. These really had nothing to
do with the added feature, hence I'm splitting them out into a
separate patchset.

This series is really 4 patches doing cleanup and preparation for
making it easier to add the task based restrictions, and patch 5 is
an improvement for how restrictions are checked. I ran some overhead
numbers and it's honestly surprisingly low for microbenchmarks. For
example, running a pure NOP workload at 13-15M op/sec, checking
restrictions is only about 1.5% of the CPU time. Never the less, I
suspect the most common restrictions applied is to limit the register
operations that can be done. Hence it makes sense to track whether
we have IORING_OP* or IORING_REGISTER* restrictions separately, so
it can be avoided to check ones op based restrictions if only register
based ones have been set.

 include/linux/io_uring_types.h |  8 ++++++--
 io_uring/io_uring.c            |  6 ++++--
 io_uring/register.c            | 35 ++++++++++++++++++++++------------
 3 files changed, 33 insertions(+), 16 deletions(-)

-- 
Jens Axboe