[PATCH v2 0/8] add persistent submission state

[Pavel Begunkov <asml.silence@gmail.com>]

Apart from unrelated first patch, this persues two goals:

1. start preparing io_uring to move resources handling into
opcode specific functions, and thus for splice(2)

2. make the first step towards some long-standing optimisation ideas

Basically, it makes struct io_submit_state embedded into ctx, so
easily accessible and persistent, and then plays a bit around that.

v2: rebase

Pavel Begunkov (8):
  io_uring: leave a comment for drain_next
  io_uring: always pass non-null io_submit_state
  io_uring: place io_submit_state into ctx
  io_uring: move ring_fd  into io_submit_state
  io_uring: move cur_mm into io_submit_state
  io_uring: move *link into io_submit_state
  io_uring: persistent req bulk allocation cache
  io_uring: optimise req bulk allocation cache

 fs/io_uring.c | 219 +++++++++++++++++++++++++++-----------------------
 1 file changed, 120 insertions(+), 99 deletions(-)

-- 
2.24.0